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Dr. Cristiano Cordeiro
Specialty Optical Fibers and Sensing Laboratory, Gleb Wataghin Physics Institute, State University of Campinas, Campinas 13083-970, Brazil

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0 Fiber Optics
0 photonic crystal fibers
0 fiber sensors
0 Teaching optics
0 Microstructured polymer optical fibers

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Journal article
Published: 05 August 2021 in Results in Optics
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In this manuscript, we report on, to the best of our knowledge, the first experimental realization of a multimode interference device based on self-image phenomenon accomplished by using a microstructured-cladding exposed-core fiber set in a singlemode-multimode-singlemode (SMS) configuration. Its application as a refractive index sensor is also demonstrated. The specialty multimode fiber studied herein exhibits a holey microstructure that surrounds and defines the fiber core. The latter, in turn, interfaces the external fiber environment thanks to lateral access along the entire fiber length. To explore the device's sensing capabilities, numerical simulations have been carried out, and the system sensitivity and spectral characteristics were evaluated. The experimental results demonstrate a refractive index sensitivity of 890 nm/RIU in the refractive index range from 1.41 to 1.43 with a detection limit of 2.7 × 10−3 RIU. This novel SMS configuration has the potential to extend the capabilities of current multimode interference-based sensors by providing an additional path to the realization of refractive index monitoring in liquid samples.

ACS Style

Jonas H. Osório; William M. Guimarães; Lu Peng; Marcos A.R. Franco; Stephen C. Warren-Smith; Heike Ebendorff-Heidepriem; Cristiano M.B. Cordeiro. Exposed-core fiber multimode interference sensor. Results in Optics 2021, 5, 100125 .

AMA Style

Jonas H. Osório, William M. Guimarães, Lu Peng, Marcos A.R. Franco, Stephen C. Warren-Smith, Heike Ebendorff-Heidepriem, Cristiano M.B. Cordeiro. Exposed-core fiber multimode interference sensor. Results in Optics. 2021; 5 ():100125.

Chicago/Turabian Style

Jonas H. Osório; William M. Guimarães; Lu Peng; Marcos A.R. Franco; Stephen C. Warren-Smith; Heike Ebendorff-Heidepriem; Cristiano M.B. Cordeiro. 2021. "Exposed-core fiber multimode interference sensor." Results in Optics 5, no. : 100125.

Addendum
Published: 09 March 2021 in Fibers
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Note: In lieu of an abstract, this is an excerpt from the first page. This paper

ACS Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. Addendum: Sultana, J., et al. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14. Fibers 2021, 9, 20 .

AMA Style

Jakeya Sultana, Saiful Islam, Cristiano M. B. Cordeiro, Alex Dinovitser, Mayank Kaushik, Brian W.-H. Ng, Derek Abbott. Addendum: Sultana, J., et al. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14. Fibers. 2021; 9 (3):20.

Chicago/Turabian Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. 2021. "Addendum: Sultana, J., et al. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14." Fibers 9, no. 3: 20.

Journal article
Published: 05 January 2021 in IEEE Access
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Fig. 4 in reference [1] is after [2] .

ACS Style

Saiful Islam; Cristiano M. B. Cordeiro; J. Nine; Jakeya Sultana; Alice L. S. Cruz; Alex Dinovitser; Brian Wai-Him Ng; Heike Ebendorff-Heidepriem; Dusan Losic; Derek Abbott. Correction to: “Experimental Study on Glass and Polymers: Determining the Optimal Material for Potential Use in Terahertz Technology”. IEEE Access 2021, 9, 2705 -2705.

AMA Style

Saiful Islam, Cristiano M. B. Cordeiro, J. Nine, Jakeya Sultana, Alice L. S. Cruz, Alex Dinovitser, Brian Wai-Him Ng, Heike Ebendorff-Heidepriem, Dusan Losic, Derek Abbott. Correction to: “Experimental Study on Glass and Polymers: Determining the Optimal Material for Potential Use in Terahertz Technology”. IEEE Access. 2021; 9 ():2705-2705.

Chicago/Turabian Style

Saiful Islam; Cristiano M. B. Cordeiro; J. Nine; Jakeya Sultana; Alice L. S. Cruz; Alex Dinovitser; Brian Wai-Him Ng; Heike Ebendorff-Heidepriem; Dusan Losic; Derek Abbott. 2021. "Correction to: “Experimental Study on Glass and Polymers: Determining the Optimal Material for Potential Use in Terahertz Technology”." IEEE Access 9, no. : 2705-2705.

Journal article
Published: 22 November 2020 in Applied Sciences
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A model-based design allows representing complex, multi-domain systems as interconnected functional blocks, yielding graphical, intuitive information about the overall project, besides simplifying simulation. This work proposes using the modular approach as an optical engineering design and educational tool for developing paraxial ray optics setups, providing further integration with mechatronics subsystems and control loops. An expanded version of the ABCD transfer matrix modeling is implemented in MATLAB Simulink environment to simultaneously perform ray tracing and dynamic simulations. The methodology is validated for different problems, including paraxial cloaking, transmission through a multimode optical fiber, a Fabry–Perot interferometer, and an optical pickup with automatic focus, yielding reliable results with prospective applications in optical engineering design and for creating virtual labs devoted to multiphysics and mechatronics engineering courses.

ACS Style

Eric Fujiwara; Cristiano M. B. Cordeiro. Model-Based Design and Simulation of Paraxial Ray Optics Systems. Applied Sciences 2020, 10, 8278 .

AMA Style

Eric Fujiwara, Cristiano M. B. Cordeiro. Model-Based Design and Simulation of Paraxial Ray Optics Systems. Applied Sciences. 2020; 10 (22):8278.

Chicago/Turabian Style

Eric Fujiwara; Cristiano M. B. Cordeiro. 2020. "Model-Based Design and Simulation of Paraxial Ray Optics Systems." Applied Sciences 10, no. 22: 8278.

Journal article
Published: 16 October 2020 in IEEE Transactions on Terahertz Science and Technology
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A hollow core antiresonant photonic crystal fiber (HC-ARPCF) is analyzed for terahertz applications. A numerical analysis of the proposed fiber is first carried out to minimize coupling between the core and cladding modes. The modeling of the scaled-up and inhibited coupling fiber is carried out by means of a Finite Element Method (FEM), which is then demonstrated using a Zeonex filament fiber, fabricated by fused deposition modeling (FDM) of 3D printing technology. The simulation is carried out to analyze both the transmission and possibility of refractometric sensing, whereas, the experimental analysis is carried out using terahertz time domain spectroscopy (THz-TDS), and supports our numerical findings, illustrating how the proposed fibers can be used for low loss transmission of terahertz waves. The simplicity of the proposed fiber structures facilitates fabrication for a number of different transmission and sensing applications in the terahertz range.

ACS Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Selim Habib; Alex Dinovitser; Mayank Kaushik; Brian Wai-Him Ng; Heike Ebendorff-Heidepriem; Derek Abbott. Hollow Core Inhibited Coupled Antiresonant Terahertz Fiber: A Numerical and Experimental Study. IEEE Transactions on Terahertz Science and Technology 2020, 11, 245 -260.

AMA Style

Jakeya Sultana, Saiful Islam, Cristiano M. B. Cordeiro, Selim Habib, Alex Dinovitser, Mayank Kaushik, Brian Wai-Him Ng, Heike Ebendorff-Heidepriem, Derek Abbott. Hollow Core Inhibited Coupled Antiresonant Terahertz Fiber: A Numerical and Experimental Study. IEEE Transactions on Terahertz Science and Technology. 2020; 11 (3):245-260.

Chicago/Turabian Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Selim Habib; Alex Dinovitser; Mayank Kaushik; Brian Wai-Him Ng; Heike Ebendorff-Heidepriem; Derek Abbott. 2020. "Hollow Core Inhibited Coupled Antiresonant Terahertz Fiber: A Numerical and Experimental Study." IEEE Transactions on Terahertz Science and Technology 11, no. 3: 245-260.

Journal article
Published: 13 August 2020 in IEEE Sensors Journal
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Measuring multiphase flows is essential in the oil and gas industry and medicine, as well as to microfluidic-based analyses. This paper presents an optical fiber sensor for assessing the speed of two-phase flows based on tilted fiber Bragg grating (TFBG). As the dispersed slugs pass by the grating, resonance dips of cladding modes shift and work like a notch filter for a given wavelength; therefore, the TBFG can be interrogated in realtime according to an intensity-based, single-wavelength setup. The system is validated for samples comprised of water, oil, and air, yielding maximum relative error of 4.4% for speed measurements, whereas the sensor response can be tailored for different fluids by choosing the wavelength of the input light.

ACS Style

Stenio Aristilde; Marco Cesar Prado Soares; Thiago D. Cabral; Gildo Rodrigues; Eric Fujiwara; Fabiano Fruett; Cristiano M. B. Cordeiro. Measurement of Multiphase Flow by Tilted Optical Fiber Bragg Grating Sensor. IEEE Sensors Journal 2020, 21, 1534 -1539.

AMA Style

Stenio Aristilde, Marco Cesar Prado Soares, Thiago D. Cabral, Gildo Rodrigues, Eric Fujiwara, Fabiano Fruett, Cristiano M. B. Cordeiro. Measurement of Multiphase Flow by Tilted Optical Fiber Bragg Grating Sensor. IEEE Sensors Journal. 2020; 21 (2):1534-1539.

Chicago/Turabian Style

Stenio Aristilde; Marco Cesar Prado Soares; Thiago D. Cabral; Gildo Rodrigues; Eric Fujiwara; Fabiano Fruett; Cristiano M. B. Cordeiro. 2020. "Measurement of Multiphase Flow by Tilted Optical Fiber Bragg Grating Sensor." IEEE Sensors Journal 21, no. 2: 1534-1539.

Journal article
Published: 03 August 2020 in IEEE Sensors Journal
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In this paper, we describe a distributed pressure sensor using a simplified and high sensitive microstructured optical fiber – the embedded-core fiber – and autocorrelation analysis of the data obtained from an optical frequency domain reflectometer (OFDR). The special fiber consists of a microcapillary, which has a germanium-doped core placed within the capillary wall. When this structure is subjected to pressure variations, an asymmetric stress distribution is induced within the fiber, entailing birefringence variations. Here, we show that the use of a commercial OFDR with submillimeter resolution together with an autocorrelation data analysis routine in the spectral domain allows mapping the fiber birefringence and performing distributed pressure sensing. In the experiments, the fiber passed through two pressure chambers, which allowed for pressure to be locally and independently applied. No cross-sensitivity between the pressure points was observed. The embedded-core fiber exhibited a birefringence sensitivity to pressure of 3.8x10-7 bar-1, which is 21% higher than that measured in commercial photonic crystal fibers using the same setup.

ACS Style

Rodrigo Mendes Gerosa; Jonas H. Osorio; Daniel Lopez-Cortes; Cristiano M. B. Cordeiro; Christiano J. S. De Matos. Distributed Pressure Sensing Using an Embedded-Core Capillary Fiber and Optical Frequency Domain Reflectometry. IEEE Sensors Journal 2020, 21, 360 -365.

AMA Style

Rodrigo Mendes Gerosa, Jonas H. Osorio, Daniel Lopez-Cortes, Cristiano M. B. Cordeiro, Christiano J. S. De Matos. Distributed Pressure Sensing Using an Embedded-Core Capillary Fiber and Optical Frequency Domain Reflectometry. IEEE Sensors Journal. 2020; 21 (1):360-365.

Chicago/Turabian Style

Rodrigo Mendes Gerosa; Jonas H. Osorio; Daniel Lopez-Cortes; Cristiano M. B. Cordeiro; Christiano J. S. De Matos. 2020. "Distributed Pressure Sensing Using an Embedded-Core Capillary Fiber and Optical Frequency Domain Reflectometry." IEEE Sensors Journal 21, no. 1: 360-365.

Journal article
Published: 17 June 2020 in IEEE Access
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We propose and numerically analyze various hollow-core antiresonant fiber (HC-ARF) for operation at terahertz frequencies. We compare typical HC-ARF designs with nested and adjacent nested designs while analyzing performance in terms of loss and single-mode guidance of terahertz waves. With optimized fiber dimensions, the fundamental core mode, cladding mode, core higher-order modes (HOMs), and the angle dependence of adjacent tubes are analyzed to find the best design for low loss terahertz transmission. Analysis of the fiber designs shows that the nested tube-based antiresonant fiber exhibits lower transmission loss and superior HOM suppression, exceeding 140. The nested HC-ARF is feasible for fabrication using existing fabrication technologies and opening up the possibility of efficient transmission of terahertz waves.

ACS Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Selim Habib; Alex Dinovitser; Brian Wai-Him Ng; Derek Abbott. Exploring Low Loss and Single Mode in Antiresonant Tube Lattice Terahertz Fibers. IEEE Access 2020, 8, 113309 -113317.

AMA Style

Jakeya Sultana, Saiful Islam, Cristiano M. B. Cordeiro, Selim Habib, Alex Dinovitser, Brian Wai-Him Ng, Derek Abbott. Exploring Low Loss and Single Mode in Antiresonant Tube Lattice Terahertz Fibers. IEEE Access. 2020; 8 ():113309-113317.

Chicago/Turabian Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Selim Habib; Alex Dinovitser; Brian Wai-Him Ng; Derek Abbott. 2020. "Exploring Low Loss and Single Mode in Antiresonant Tube Lattice Terahertz Fibers." IEEE Access 8, no. : 113309-113317.

Regular
Published: 16 June 2020 in Photonic Sensors
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We present a new procedure for protecting micro-optical fibers (tapered fibers) by using the 3-dimension (3D) printing technology. A standard single-mode optical fiber was tapered down to the diameter of 1 µm and embedded in a polymeric matrix obtained by an additive manufacturing routine. We show that the proposed structure protects the fiber taper against environmental humidity while keeping permeability to gas flow and the possibility of the realization of gas detection experiments. To our knowledge, this is the first time 3D printed casings were applied to protect fiber tapers from humidity deterioration. We envisage this new approach will allow the development of new fiber taper devices to better resist in humid environments.

ACS Style

Kaleb Roncatti de Souza; Jonas H. Osório; Juliana B. Carvalho; Beatriz Mota Lima; Cristiano M. B. Cordeiro. 3D Printing Technology for Tapered Optical Fiber Protection With Gas Sensing Possibilities. Photonic Sensors 2020, 10, 298 -305.

AMA Style

Kaleb Roncatti de Souza, Jonas H. Osório, Juliana B. Carvalho, Beatriz Mota Lima, Cristiano M. B. Cordeiro. 3D Printing Technology for Tapered Optical Fiber Protection With Gas Sensing Possibilities. Photonic Sensors. 2020; 10 (4):298-305.

Chicago/Turabian Style

Kaleb Roncatti de Souza; Jonas H. Osório; Juliana B. Carvalho; Beatriz Mota Lima; Cristiano M. B. Cordeiro. 2020. "3D Printing Technology for Tapered Optical Fiber Protection With Gas Sensing Possibilities." Photonic Sensors 10, no. 4: 298-305.

Journal article
Published: 15 June 2020 in Scientific Reports
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Manufacturing optical fibers with a microstructured cross-section relies on the production of a fiber preform in a multiple-stage procedure, and drawing of the preform to fiber. These processes encompass the use of several dedicated and sophisticated equipment, including a fiber drawing tower. Here we demonstrate the use of a commercial table-top low-cost filament extruder to produce optical fibers with complex microstructure in a single step - from the pellets of the optical material directly to the final fiber. The process does not include the use of an optical fiber drawing tower and is time, electrical power, and floor space efficient. Different fiber geometries (hexagonal-lattice solid core, suspended core and hollow core) were successfully fabricated and their geometries evaluated. Air guidance in a wavelength range where the fiber material is opaque was shown in the hollow core fiber.

ACS Style

Cristiano M. B. Cordeiro; Alson Ng; Heike Ebendorff-Heidepriem. Ultra-simplified Single-Step Fabrication of Microstructured Optical Fiber. Scientific Reports 2020, 10, 9678 .

AMA Style

Cristiano M. B. Cordeiro, Alson Ng, Heike Ebendorff-Heidepriem. Ultra-simplified Single-Step Fabrication of Microstructured Optical Fiber. Scientific Reports. 2020; 10 (1):9678.

Chicago/Turabian Style

Cristiano M. B. Cordeiro; Alson Ng; Heike Ebendorff-Heidepriem. 2020. "Ultra-simplified Single-Step Fabrication of Microstructured Optical Fiber." Scientific Reports 10, no. 1: 9678.

Journal article
Published: 04 June 2020 in Optics Letters
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The inception of photonic crystal fibers (PCFs) allowed for unprecedented tailoring of waveguide properties for specialty sensing probes. Exposed core microstructured fibers (ECFs) represent a natural evolution of the PCF design for practical liquid and gas sensing. Until now, to the best of our knowledge, only single-mode or few-modes ECFs have been explored. In this Letter, we demonstrate a highly multimode ECF with a lateral access that extends throughout the whole length of the fiber. The ECF is operated as a fiber specklegram sensor for assessing properties of fluids and interrogated using a simple and low-cost setup. The probe exhibits a refractive index resolution and sensitivity of at least 4.6×10-4 refractive index units (RIUs) and -10.97RIU-1, respectively. A maximum temperature resolution up to 0.017°C with a -0.20∘C-1 temperature sensitivity over the 23°C-28°C range and a liquid level sensing resolution up to 0.12 mm with -0.015mm-1 sensitivity over the 0.0-50.0 mm bathed the length range in water.

ACS Style

Thiago D. Cabral; Eric Fujiwara; Stephen C. Warren-Smith; Heike Ebendorff-Heidepriem; Cristiano M. B. Cordeiro. Multimode exposed core fiber specklegram sensor. Optics Letters 2020, 45, 3212 -3215.

AMA Style

Thiago D. Cabral, Eric Fujiwara, Stephen C. Warren-Smith, Heike Ebendorff-Heidepriem, Cristiano M. B. Cordeiro. Multimode exposed core fiber specklegram sensor. Optics Letters. 2020; 45 (12):3212-3215.

Chicago/Turabian Style

Thiago D. Cabral; Eric Fujiwara; Stephen C. Warren-Smith; Heike Ebendorff-Heidepriem; Cristiano M. B. Cordeiro. 2020. "Multimode exposed core fiber specklegram sensor." Optics Letters 45, no. 12: 3212-3215.

Journal article
Published: 21 May 2020 in IEEE Access
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The optical properties of polymers and glasses useful for terahertz applications are experimentally characterized using terahertz time-domain spectroscopy (THz-TDS). A standard system setup utilizing transmission spectroscopy is used to measure different optical properties of materials including refractive index, relative permittivity, loss tangent, absorption coefficient, and transmittance. The thermal and chemical dependencies of materials are also studied to identify the appropriate materials for given terahertz applications. The selected materials can then be utilized for applications such as in waveguides, filters, lenses, polarization preserving devices, metamaterials and metasurfaces, absorbers, and sensors in the terahertz frequency range.

ACS Style

Saiful Islam; Cristiano M. B. Cordeiro; M. J. Nine; Jakeya Sultana; Alice L. S. Cruz; Alex Dinovitser; Brian Wai-Him Ng; Heike Ebendorff-Heidepriem; Dusan Losic; Derek Abbott. Experimental Study on Glass and Polymers: Determining the Optimal Material for Potential Use in Terahertz Technology. IEEE Access 2020, 8, 97204 -97214.

AMA Style

Saiful Islam, Cristiano M. B. Cordeiro, M. J. Nine, Jakeya Sultana, Alice L. S. Cruz, Alex Dinovitser, Brian Wai-Him Ng, Heike Ebendorff-Heidepriem, Dusan Losic, Derek Abbott. Experimental Study on Glass and Polymers: Determining the Optimal Material for Potential Use in Terahertz Technology. IEEE Access. 2020; 8 (99):97204-97214.

Chicago/Turabian Style

Saiful Islam; Cristiano M. B. Cordeiro; M. J. Nine; Jakeya Sultana; Alice L. S. Cruz; Alex Dinovitser; Brian Wai-Him Ng; Heike Ebendorff-Heidepriem; Dusan Losic; Derek Abbott. 2020. "Experimental Study on Glass and Polymers: Determining the Optimal Material for Potential Use in Terahertz Technology." IEEE Access 8, no. 99: 97204-97214.

Journal article
Published: 13 May 2020 in Optics Express
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Lying between optical and microwave ranges, the terahertz band in the electromagnetic spectrum is attracting increased attention. Optical fibers are essential for developing the full potential of complex terahertz systems. In this manuscript, we review the optimal materials, the guiding mechanisms, the fabrication methodologies, the characterization methods and the applications of such terahertz waveguides. We examine various optical fiber types including tube fibers, solid core fiber, hollow-core photonic bandgap, anti-resonant fibers, porous-core fibers, metamaterial-based fibers, and their guiding mechanisms. The optimal materials for terahertz applications are discussed. The past and present trends of fabrication methods, including drilling, stacking, extrusion and 3D printing, are elaborated. Fiber characterization methods including different optics for terahertz time-domain spectroscopy (THz-TDS) setups are reviewed and application areas including short-distance data transmission, imaging, sensing, and spectroscopy are discussed.

ACS Style

Saiful Islam; Cristiano M. B. Cordeiro; Marcos A. R. Franco; Jakeya Sultana; Alice L. S. Cruz; Derek Abbott. Terahertz optical fibers [Invited]. Optics Express 2020, 28, 16089 -16117.

AMA Style

Saiful Islam, Cristiano M. B. Cordeiro, Marcos A. R. Franco, Jakeya Sultana, Alice L. S. Cruz, Derek Abbott. Terahertz optical fibers [Invited]. Optics Express. 2020; 28 (11):16089-16117.

Chicago/Turabian Style

Saiful Islam; Cristiano M. B. Cordeiro; Marcos A. R. Franco; Jakeya Sultana; Alice L. S. Cruz; Derek Abbott. 2020. "Terahertz optical fibers [Invited]." Optics Express 28, no. 11: 16089-16117.

Journal article
Published: 17 February 2020 in Fibers
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A hollow core antiresonant photonic crystal fiber (HC-ARPCF) with metal inclusions is numerically analyzed for transmission of terahertz (THz) waves. The propagation of fundamental and higher order modes are investigated and the results are compared with conventional dielectric antiresonant (AR) fiber designs. Simulation results show that broadband terahertz radiation can be guided with six times lower loss in such hollow core fibers with metallic inclusions, compared to tube lattice fiber, covering a single mode bandwidth (BW) of 700 GHz.

ACS Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers 2020, 8, 14 .

AMA Style

Jakeya Sultana, Saiful Islam, Cristiano M. B. Cordeiro, Alex Dinovitser, Mayank Kaushik, Brian W.-H. Ng, Derek Abbott. Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding. Fibers. 2020; 8 (2):14.

Chicago/Turabian Style

Jakeya Sultana; Saiful Islam; Cristiano M. B. Cordeiro; Alex Dinovitser; Mayank Kaushik; Brian W.-H. Ng; Derek Abbott. 2020. "Terahertz Hollow Core Antiresonant Fiber with Metamaterial Cladding." Fibers 8, no. 2: 14.

Journal article
Published: 18 September 2019 in Optical Fiber Technology
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This paper aims to numerical and experimentally study and propose Fiber Bragg Grating (FBG) sensors embedded in 3D printed casings. 3D printed casings offer design freedom, enabling strain measurement of structural systems with complex configuration, and, at low cost due to its easiness to manufacture. The casings were first numerically modeled using a commercial finite element software. After the casing was conceptualized to the user needs, they were printed and introduced in two different applications. Assessing the behavior of 3D printed casings in realistic applications has been explored only by few authors, which is the novelty introduced herein. In both applications, the casings’ behavior was analyzed numerical and experimentally. The experimental results were compared with electrical strain gauges. As expected from the numerical analysis results, a calibration factor was determined to accurately predict strain using the embedded FBG sensors. A comprehensive discussion is presented on the topic of calibration factors defined numerical and experimentally.

ACS Style

Natalia Reggiani Manzo; Gabriel T. Callado; Cristiano M.B. Cordeiro; Luiz Carlos M. Vieira Jr.. Embedding optical Fiber Bragg Grating (FBG) sensors in 3D printed casings. Optical Fiber Technology 2019, 53, 102015 .

AMA Style

Natalia Reggiani Manzo, Gabriel T. Callado, Cristiano M.B. Cordeiro, Luiz Carlos M. Vieira Jr.. Embedding optical Fiber Bragg Grating (FBG) sensors in 3D printed casings. Optical Fiber Technology. 2019; 53 ():102015.

Chicago/Turabian Style

Natalia Reggiani Manzo; Gabriel T. Callado; Cristiano M.B. Cordeiro; Luiz Carlos M. Vieira Jr.. 2019. "Embedding optical Fiber Bragg Grating (FBG) sensors in 3D printed casings." Optical Fiber Technology 53, no. : 102015.

Journal article
Published: 09 July 2019 in Journal of Lightwave Technology
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An optical fiber specklegram chemical sensor based on a concatenated multimode-no-core-multimode structure is reported. The 30 mm no-core section is immersed in the analyzed liquid so the number of excited modes is modulated by the surrounding refractive index value, affecting the interference of the several propagating modes and consequently the output specklegram, whose changes are quantified by the zero mean normalized cross-correlation coefficient. The sensor was evaluated on the measurement of ethanol-water solutions, resulting in 18.7 RIU-1 sensitivity (5×10-4 resolution) for the 1.33 to 1.36 refractive index interval, besides 0.07°C-1 temperature sensitivity within the 26 to 32°C range. Moreover, the system was also tested on liquid level measurements, yielding 0.05 mm-1 sensitivity and 0.2 mm resolution. The results are comparable to previously reported multimodal interferometers based on more complicated interrogation schemes, indicating that the specklegram sensor is a feasible alternative for the sensitive and straightforward measurement of liquid samples.

ACS Style

Eric Fujiwara; Luiz Evaristo Da Silva; Thiago Destri Cabral; Hugo Eugenio De Freitas; Yu Tzu Wu; Cristiano Monteiro De Barros Cordeiro. Optical Fiber Specklegram Chemical Sensor Based on a Concatenated Multimode Fiber Structure. Journal of Lightwave Technology 2019, 37, 5041 -5047.

AMA Style

Eric Fujiwara, Luiz Evaristo Da Silva, Thiago Destri Cabral, Hugo Eugenio De Freitas, Yu Tzu Wu, Cristiano Monteiro De Barros Cordeiro. Optical Fiber Specklegram Chemical Sensor Based on a Concatenated Multimode Fiber Structure. Journal of Lightwave Technology. 2019; 37 (19):5041-5047.

Chicago/Turabian Style

Eric Fujiwara; Luiz Evaristo Da Silva; Thiago Destri Cabral; Hugo Eugenio De Freitas; Yu Tzu Wu; Cristiano Monteiro De Barros Cordeiro. 2019. "Optical Fiber Specklegram Chemical Sensor Based on a Concatenated Multimode Fiber Structure." Journal of Lightwave Technology 37, no. 19: 5041-5047.

Journal article
Published: 02 July 2019 in Journal of the Mechanical Behavior of Biomedical Materials
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The aim of this study was to evaluate the biomechanical properties expressed by shrinkage stress, cuspal strain, fracture strength and failure mode in molars with large class II mesio-occlusal-distal restorations. Sixty-four human caries-free third molars were selected and distributed randomly into four groups: Z100 restorative material (Z100), Tetric N-Ceram Bulk-Fill (TNC), Filtek Bulk-Fill (FBF) and Aura Ultra Universal (ABF). The bulk-fill materials were inserted in one singular bulk increment and the conventional composite resin in three ones. Polymerisation shrinkage stress was evaluated by optical Fibre Bragg Gratings (FBG) sensors (n = 6). The cuspal deformation was measured using an extensometer during three moments: restorative procedure, axial compressive loading and at fracture (n = 10). The fracture strength was evaluated on a universal machine. The failure mode was analysed by Scanning Electron Microscopy (SEM). Data were analysed using one-way ANOVA tests with Tukey's posthoc test (α = 5%). Data of the failure mode were submitted to a likelihood ratio chi-square test. Z100 presented the highest mean value for the shrinkage stress (p < 0.05) by FBG evaluation, whereas bulk-fill resin groups presented low polymerisation stress mean value, especially the TNC (p < 0.05). The cuspal deformation test showed that Z100 presented a significant difference mean value compared to the other groups (p < 0.01) during the restoration and compressive axial force; however, load until the fracture presented a difference only between TNC and FBF (p < 0.05). The fracture strength of TNC was statistically different from Z100 (p < 0.01). The failure mode was not statistically different in all the groups (p > 0.05). Bulk-fill composites promoted less polymerisation shrinkage stress than conventional microhybrid composite during and after the light curing process in class II posterior resin composite restorations.

ACS Style

Rodrigo Barros Esteves Lins; Stenio Aristilde; Jonas H. Osório; Cristiano M.B. Cordeiro; Cristiane Rumi Fujiwara Yanikian; Aline Arêdes Bicalho; Thiago Henrique Scarabello Stape; Carlos José Soares; Luís Roberto Marcondes Martins. Biomechanical behaviour of bulk-fill resin composites in class II restorations. Journal of the Mechanical Behavior of Biomedical Materials 2019, 98, 255 -261.

AMA Style

Rodrigo Barros Esteves Lins, Stenio Aristilde, Jonas H. Osório, Cristiano M.B. Cordeiro, Cristiane Rumi Fujiwara Yanikian, Aline Arêdes Bicalho, Thiago Henrique Scarabello Stape, Carlos José Soares, Luís Roberto Marcondes Martins. Biomechanical behaviour of bulk-fill resin composites in class II restorations. Journal of the Mechanical Behavior of Biomedical Materials. 2019; 98 ():255-261.

Chicago/Turabian Style

Rodrigo Barros Esteves Lins; Stenio Aristilde; Jonas H. Osório; Cristiano M.B. Cordeiro; Cristiane Rumi Fujiwara Yanikian; Aline Arêdes Bicalho; Thiago Henrique Scarabello Stape; Carlos José Soares; Luís Roberto Marcondes Martins. 2019. "Biomechanical behaviour of bulk-fill resin composites in class II restorations." Journal of the Mechanical Behavior of Biomedical Materials 98, no. : 255-261.

Journal article
Published: 14 June 2019 in IEEE Sensors Journal
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An optical fiber anemometer based on a flexible multi-FBG curvature sensor is reported. The probe is comprised of a structured polymer shell with embedded single-mode fibers with written fiber Bragg gratings. When the sensor is bent, the different spectral shift of the Bragg wavelengths allows the determination of the mechanical stimulus. Moreover, the probe was also used as a cantilever sensor for assessing the airflow speed in a wind tunnel. The sensor presented sensitivities of 0.8 nm/m−1 and 1.05 pm/(m/s) for curvature and square speed measurements, respectively, and the sensing characteristics can be improved by simply changing the material and the geometry of the bulk polymer shell, providing a versatile and feasible probe for mechanical and flow measurements.

ACS Style

Eric Fujiwara; Juliano G. Hayashi; Tiago Da Silva Delfino; Pedro Jorge; Cristiano Monteiro De Barros Cordeiro. Optical Fiber Anemometer Based on a Multi-FBG Curvature Sensor. IEEE Sensors Journal 2019, 19, 8727 -8732.

AMA Style

Eric Fujiwara, Juliano G. Hayashi, Tiago Da Silva Delfino, Pedro Jorge, Cristiano Monteiro De Barros Cordeiro. Optical Fiber Anemometer Based on a Multi-FBG Curvature Sensor. IEEE Sensors Journal. 2019; 19 (19):8727-8732.

Chicago/Turabian Style

Eric Fujiwara; Juliano G. Hayashi; Tiago Da Silva Delfino; Pedro Jorge; Cristiano Monteiro De Barros Cordeiro. 2019. "Optical Fiber Anemometer Based on a Multi-FBG Curvature Sensor." IEEE Sensors Journal 19, no. 19: 8727-8732.

Journal article
Published: 14 May 2019 in Photonics
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We report on the study of an intensity-based optical fiber sensor for gasoline quality monitoring. The sensor setup employs two Bragg gratings with different spectral responses to interrogate the optical response of a tilted Bragg grating. The sensor operation is based on the tilted Bragg grating sensitivity to external refractive index changes, which are translated as power variations by the interrogation scheme. Gasoline–ethanol solutions with concentrations ranging from 0% to 60% ethanol were used to demonstrate the sensor performance. The results allowed to estimate that the sensor is able, within its resolution limit, to detect ethanol concentration variations of 1.5% in gasoline–ethanol solutions and discriminate temperature variations of 0.5 °C. The all-optical sensor setup is compact and robust, making it a competitive alternative for the realization of fuel quality analyses in practical applications.

ACS Style

Stenio Aristilde; Cristiano M. B. Cordeiro; Jonas H. Osório. Gasoline Quality Sensor Based on Tilted Fiber Bragg Gratings. Photonics 2019, 6, 51 .

AMA Style

Stenio Aristilde, Cristiano M. B. Cordeiro, Jonas H. Osório. Gasoline Quality Sensor Based on Tilted Fiber Bragg Gratings. Photonics. 2019; 6 (2):51.

Chicago/Turabian Style

Stenio Aristilde; Cristiano M. B. Cordeiro; Jonas H. Osório. 2019. "Gasoline Quality Sensor Based on Tilted Fiber Bragg Gratings." Photonics 6, no. 2: 51.

Journal article
Published: 08 May 2019 in IEEE Transactions on Instrumentation and Measurement
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An optical fiber anemometer based on the Pitot-static tube is reported. The device was fabricated in a 3D printer and the pressure difference was assessed by means of a latex rubber diaphragm with a mounted fiber Bragg grating probe, so the membrane deflection is obtained in terms of the fiber curvature. The sensor characteristics were firstly obtained by simulation in order to determine the correlation between the Bragg wavelength shifts and the airflow speed. Next, the device was experimentally evaluated in a wind tunnel, allowing for the assessment of a 20 to 36 m/s dynamic range, with 24.9 pm/(m/s) maximum sensitivity and 0.04 m/s resolution. Finally, the system was tested on the measurement of cyclic airflow speeds for predicting the applied speed according to the calibration curve, yielding reproducible results with an average error of 0.98 m/s, which is comparable to other reported sensors based on more complex designs and interrogation setups.

ACS Style

Eric Fujiwara; Tiago Da Silva Delfino; Thiago Destri Cabral; Cristiano Monteiro De Barros Cordeiro. All-Optical Fiber Anemometer Based on the Pitot-Static Tube. IEEE Transactions on Instrumentation and Measurement 2019, 69, 1805 -1811.

AMA Style

Eric Fujiwara, Tiago Da Silva Delfino, Thiago Destri Cabral, Cristiano Monteiro De Barros Cordeiro. All-Optical Fiber Anemometer Based on the Pitot-Static Tube. IEEE Transactions on Instrumentation and Measurement. 2019; 69 (4):1805-1811.

Chicago/Turabian Style

Eric Fujiwara; Tiago Da Silva Delfino; Thiago Destri Cabral; Cristiano Monteiro De Barros Cordeiro. 2019. "All-Optical Fiber Anemometer Based on the Pitot-Static Tube." IEEE Transactions on Instrumentation and Measurement 69, no. 4: 1805-1811.