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The transmission characteristics of dielectric-coated metallic hollow waveguides (DMHW) are simulated by means of Ray Model, Transmission Line Model, and Finite Element Analysis methods. By comparing the simulation results in mid- and far-infrared, terahertz and millimeter wavelength bands, the range of application and deviation analysis of three simulation methods are presented. Limitations of each simulation model are summarized. The optimization methods of structural parameters for the DMHW in various wavelength bands are provided. The loss properties of the DMHW were measured in 2–10 μm infrared wavelength band, 140–220 GHz millimeter wavelength band, and 2.5THz and 4.3THz frequencies. The measured data agree with the simulation results.
Jiafu Zeng; Menghui He; Xian Zhang; Xiaosong Zhu; Yiwei Shi. Simulation methods and transmission characteristics of dielectric-coated metallic waveguides from mid-infrared to millimeter waves. Applied Physics A 2021, 127, 1 -7.
AMA StyleJiafu Zeng, Menghui He, Xian Zhang, Xiaosong Zhu, Yiwei Shi. Simulation methods and transmission characteristics of dielectric-coated metallic waveguides from mid-infrared to millimeter waves. Applied Physics A. 2021; 127 (7):1-7.
Chicago/Turabian StyleJiafu Zeng; Menghui He; Xian Zhang; Xiaosong Zhu; Yiwei Shi. 2021. "Simulation methods and transmission characteristics of dielectric-coated metallic waveguides from mid-infrared to millimeter waves." Applied Physics A 127, no. 7: 1-7.
A high-performance Bloch surface wave (BSW) sensor based on the hollow fiber (HF) inner coated with the one-dimensional photonic crystal (1DPC) consisting of TiO 2 and SiO 2 bilayers is proposed. Performances including sensitivity and figure of merit (FOM) of the sensor are investigated theoretically with the ray transmission model. Several structure parameters such as the center wavelength of 1DPC, the thickness of the cap layer and the bilayer period are optimized to obtain a best performance of the sensor. The results show that the proposed sensor has an ultra-high FOM over 1100 RIU-1, which is approximately two and one orders of magnitude higher than that of the HF surface plasmon resonance (SPR) sensor and HF long-range SPR sensor, respectively. Moreover, the proposed sensor has a much broader practical RI detection range, which makes it more useful in sensing applications. The performance of the proposed sensor applicated in temperature sensing is also estimated to prove its application potential.
Yi-Xiao Tang; Xian Zhang; Xiao-Song Zhu; Yi-Wei Shi. One-Dimensional Photonic Crystal Inner Coated Hollow Fiber Sensor Based on Bloch Surface Wave With Ultra-High Figure of Merit. IEEE Photonics Journal 2020, 13, 1 -10.
AMA StyleYi-Xiao Tang, Xian Zhang, Xiao-Song Zhu, Yi-Wei Shi. One-Dimensional Photonic Crystal Inner Coated Hollow Fiber Sensor Based on Bloch Surface Wave With Ultra-High Figure of Merit. IEEE Photonics Journal. 2020; 13 (1):1-10.
Chicago/Turabian StyleYi-Xiao Tang; Xian Zhang; Xiao-Song Zhu; Yi-Wei Shi. 2020. "One-Dimensional Photonic Crystal Inner Coated Hollow Fiber Sensor Based on Bloch Surface Wave With Ultra-High Figure of Merit." IEEE Photonics Journal 13, no. 1: 1-10.
The objective of this paper is to fabricate a flexible mid-infrared (IR) light delivery system with bioprobesince remarkable biological effect of mid-IR light and lack of corresponding technical devices. Hollow optical fiber with sealing window of different materials and shapes was fabricated and packaged within a metal tube for delivering mid-IR light and electrical signal. The thickness of the sealing window was optimized consideringmechanical strength, loss, and power density threshold. A bioprobe with a SMA connector was manufactured. A patch cord loaded with low-loss mid-IR hollow optical fiber was prepared and can be connected to the bioprobeby a standard SMA jointer. The loss of the bioprobe was 1.38 dB and 1.07 dB at the wavelength of 5.1 μm and 10.6 μm, respectively. The output beam of the bioprobe can be controlled by sealing windows of different shapes, which had a far-field half divergence angle of 0.03–0.44 rad. The system had a power density threshold of 382 mW/mm2 and a loss of 3.44 dB at 10.6 μm. A light delivery system with bioprobe was manufactured, which provided a photoelectric device for the application of mid-IR light in the field of neuroscience. The presented system is of high efficiency electro-optic transmission and of high power density threshold, and the applicable wavelength can be extended to far-IR and terahertz by changing the fabrication process of hollow optical fiber.
Chuandi Peng; Junzhe Zheng; Menghui He; Zeqiao Zhao; Xian Zhang; Xiao-Song Zhu; Chengbin Jing; Chao Chang; Yi-Wei Shi. Development of flexible mid-infrared light delivery system with bioprobe for beam control. Optics and Lasers in Engineering 2020, 134, 106261 .
AMA StyleChuandi Peng, Junzhe Zheng, Menghui He, Zeqiao Zhao, Xian Zhang, Xiao-Song Zhu, Chengbin Jing, Chao Chang, Yi-Wei Shi. Development of flexible mid-infrared light delivery system with bioprobe for beam control. Optics and Lasers in Engineering. 2020; 134 ():106261.
Chicago/Turabian StyleChuandi Peng; Junzhe Zheng; Menghui He; Zeqiao Zhao; Xian Zhang; Xiao-Song Zhu; Chengbin Jing; Chao Chang; Yi-Wei Shi. 2020. "Development of flexible mid-infrared light delivery system with bioprobe for beam control." Optics and Lasers in Engineering 134, no. : 106261.
A new gas absorption module, the substrate-embedded hollow waveguide (eHWG) model, is proposed. It consists of a substrate with a curved channel and a hollow waveguide. The hollow waveguide is curved into the channel and works as a gas absorption cell as well as a transmission medium for mid-infrared light. Owing to the low loss property of the hollow waveguide, the signal-to-noise ratio (SNR) was improved for the sensing system. A polycarbonate (PC) base tube was used to obtain flexibility in the fabrication of the hollow waveguide. A silver (Ag) layer and a silver iodide (AgI) layer were inner-coated to ensure a low loss property at the fingerprint wavelength of methane gas. A sensing system was established using a Fourier transform infrared spectrometer (FTIR), an external detector, and an eHWG. Experimental investigations were carried on the sensing performance of eHWGs with various channel shapes. Comparison studies were made on eHWGs embedded with Ag-coated or Ag- and AgI-coated hollow waveguides. The Ag- and AgI-coated hollow waveguides with inner diameters of 0.7, 1.4, and 2.0 mm were used in the eHWGs. The large bore waveguide had low loss but high bending additional loss. The large bore waveguide had a low detection limit due to high coupling efficiency with the light source. A limit of detection (LOD) as low as 2.7 ppm was attained for the system using the eHWG with the long and large bore waveguide.
Kewang Chen; Zeqiao Zhao; Xuewen Zhang; Xian Zhang; Xiaosong Zhu; Yiwei Shi. Characterization of Gas Absorption Modules Based on Flexible Mid-Infrared Hollow Waveguides. Sensors 2019, 19, 1698 .
AMA StyleKewang Chen, Zeqiao Zhao, Xuewen Zhang, Xian Zhang, Xiaosong Zhu, Yiwei Shi. Characterization of Gas Absorption Modules Based on Flexible Mid-Infrared Hollow Waveguides. Sensors. 2019; 19 (7):1698.
Chicago/Turabian StyleKewang Chen; Zeqiao Zhao; Xuewen Zhang; Xian Zhang; Xiaosong Zhu; Yiwei Shi. 2019. "Characterization of Gas Absorption Modules Based on Flexible Mid-Infrared Hollow Waveguides." Sensors 19, no. 7: 1698.
A high performance hollow fiber (HF) refractive index (RI) sensor utilizing Tamm plasmon polariton (TPP) is proposed. The structure of the sensor is a HF with the one dimensional photonic crystal (1DPC)/metal multi-films coated on the inner surface of supporting tube. Theoretical analysis based on a ray transmission model is carried out to evaluate the performance of the designed sensor. Because the lights transmitted in the HF have much larger incident angles than those in the prism based sensors, the center wavelength of the 1DPC should shift to longer wavelength. The origin of multiple resonance dips in the transmission spectrum is investigated by calculating the dispersion curve of TPP and the electric field distribution in the 1DPC/metal structure. The performance and the variation of the RI detection range of the sensor with different bilayer period is also analyzed theoretically. The optimal bilayer period of the sensor for achieving the highest figure of merit (FOM) at different sensed RI is obtained. Compared to the conventional HF surface plasmon resonance sensors which can only detect sensed medium with RI higher than that of the supporting tube material, the RI detection range of the proposed sensor is largely extended to 1.33-1.60 while the FOM is enhanced several times.
Xian Zhang; Xiao-Song Zhu; Yi-Wei Shi. Tamm Plasmon Polariton Based Hollow Fiber Refractive Index Sensor With One-Dimensional Photonic Crystal/Metal Structure. IEEE Sensors Journal 2018, 19, 2570 -2575.
AMA StyleXian Zhang, Xiao-Song Zhu, Yi-Wei Shi. Tamm Plasmon Polariton Based Hollow Fiber Refractive Index Sensor With One-Dimensional Photonic Crystal/Metal Structure. IEEE Sensors Journal. 2018; 19 (7):2570-2575.
Chicago/Turabian StyleXian Zhang; Xiao-Song Zhu; Yi-Wei Shi. 2018. "Tamm Plasmon Polariton Based Hollow Fiber Refractive Index Sensor With One-Dimensional Photonic Crystal/Metal Structure." IEEE Sensors Journal 19, no. 7: 2570-2575.
A high performance hollow fiber (HF) refractive index (RI) sensor utilizing Tamm plasmon polariton is proposed. The structure of the sensor is a HF with the one dimensional photonic crystal (1DPC)/metal multi-films coated on the inner surface of supporting tube. Theoretical analysis based on a ray transmission model is carried out to evaluate the performance of the designed sensor. Because the lights transmitted in the HF have much larger incident angles than those in the prism based sensors, the center wavelength of the 1DPC should shift to longer wavelength. The origin of multiple resonance dips in the transmission spectrum is investigated by calculating the electric field distribution in the 1DPC/metal structure. The variation of the RI detection range of the sensor with different bilayer period is also analyzed. The optimal bilayer period of the sensor for achieving the highest figure of merit (FOM) at different sensed RI is obtained. Compared to the convention HF surface plasmon resonance sensors which can only detect sensed medium with RI higher than that of the supporting tube material, the RI detection range of the proposed sensor is largely extended to 1.33-1.60 while the FOM is enhanced several times.
Xian Zhang; Xiao-Song Zhu; Yi-Wei Shi. One dimensional photonic crystal/metal structure hollow fiber refractive index sensor based on Tamm plasmon polariton. Tenth International Conference on Information Optics and Photonics 2018, 10964, 1096437 .
AMA StyleXian Zhang, Xiao-Song Zhu, Yi-Wei Shi. One dimensional photonic crystal/metal structure hollow fiber refractive index sensor based on Tamm plasmon polariton. Tenth International Conference on Information Optics and Photonics. 2018; 10964 ():1096437.
Chicago/Turabian StyleXian Zhang; Xiao-Song Zhu; Yi-Wei Shi. 2018. "One dimensional photonic crystal/metal structure hollow fiber refractive index sensor based on Tamm plasmon polariton." Tenth International Conference on Information Optics and Photonics 10964, no. : 1096437.
Big-bore, low-loss, and extremely flexible hollow waveguides were fabricated for mid-infrared spectroscopic gas sensing. The waveguide with inner/outer diameter of 1.4/2.0 mm can be curved with a bending radius as small as 1.4 cm A module of gas absorption cell for spectroscopic sensing was proposed with the hollow waveguide curved into a channeled substrate. Hollow waveguide with inner coatings of silver and silver iodide films attains low loss in the mid-infrared region for methane gas detection. Sensing properties for the module was experimentally discussed. Limit of detection of 6 ppm was obtained by using an FTIR (Fourier Transform infrared spectroscopy) system and DTGS (deuterated triglycine sulfate) detector. Comparisons were made to metallic hollow waveguide only with silver inner coating.
Kewang Chen; Xuewen Zhang; Zeqiao Zhao; Jingyi Wei; Xiaosong Zhu; Yiwei Shi. Big bore and extremely flexible mid-infrared hollow waveguide for gas absorption module. Sensors and Actuators A: Physical 2018, 285, 45 -49.
AMA StyleKewang Chen, Xuewen Zhang, Zeqiao Zhao, Jingyi Wei, Xiaosong Zhu, Yiwei Shi. Big bore and extremely flexible mid-infrared hollow waveguide for gas absorption module. Sensors and Actuators A: Physical. 2018; 285 ():45-49.
Chicago/Turabian StyleKewang Chen; Xuewen Zhang; Zeqiao Zhao; Jingyi Wei; Xiaosong Zhu; Yiwei Shi. 2018. "Big bore and extremely flexible mid-infrared hollow waveguide for gas absorption module." Sensors and Actuators A: Physical 285, no. : 45-49.
Ethylene-vinyl acetate (EVA) copolymer was adopted as the dielectric material to fabricate the dielectric/silver coated hollow fiber (HF) with a dynamic liquid-phase coating method. The corresponding EVA film thicknesses of the EVA/silver coated HFs fabricated with different coating velocities and concentrations of EVA solution were obtained by analyzing the measured loss spectra with theoretical calculations. The relationship between the thickness of EVA film and the fabrication parameters was concluded as a reference for the design and fabrication of such kind of HF. The material dispersion property of the EVA film coated inside the HF was also evaluated. Under the optimum fabrication condition we suggested, the EVA film showed high quality in smoothness and uniformity.
Xian Zhang; Xiao-Song Zhu; Yi-Wei Shi. Fabrication and performance investigation of the EVA/Ag coated hollow fiber. Optics & Laser Technology 2018, 111, 802 -809.
AMA StyleXian Zhang, Xiao-Song Zhu, Yi-Wei Shi. Fabrication and performance investigation of the EVA/Ag coated hollow fiber. Optics & Laser Technology. 2018; 111 ():802-809.
Chicago/Turabian StyleXian Zhang; Xiao-Song Zhu; Yi-Wei Shi. 2018. "Fabrication and performance investigation of the EVA/Ag coated hollow fiber." Optics & Laser Technology 111, no. : 802-809.
A novel high performance optical fiber refractive index (RI) sensor based on the hybrid transverse magnetic (TM) mode of Tamm plasmon polariton (TPP) and surface plasmon polariton (SPP) is proposed. The structure of the sensor is a multi-mode optical fiber with a one dimensional photonic crystal (1 DPC)/metal multi-films outer coated on its fiber core. A simulation study of the proposed sensor is carried out with the geometrical optical model to investigate the performance of the designed sensor with respect to the center wavelength, bilayer period and the thickness of silver layer. Because the lights transmitted in the fiber sensor have much larger incident angles than those in the prism based sensors, the center wavelength of the 1 DPC should shift to longer wavelength. When the coupling between TM-TPP and SPP is stronger, the sensor exhibits better performance because the electromagnetic field of the TPP-SPP hybrid mode is enhanced more in the analyte. Compared to most conventional fiber surface plasmon resonance sensors, the figure of merit of the proposed sensor is much higher while the sensitivity is comparable. The idea of utilizing TPP-SPP hybrid mode for RI sensing in the solid-core optical fiber structure presented in this paper could contribute to the study of the fiber RI sensor based on TPP.
Xian Zhang; Xiao-Song Zhu; Yi-Wei Shi. An Optical Fiber Refractive Index Sensor Based on the Hybrid Mode of Tamm and Surface Plasmon Polaritons. Sensors 2018, 18, 2129 .
AMA StyleXian Zhang, Xiao-Song Zhu, Yi-Wei Shi. An Optical Fiber Refractive Index Sensor Based on the Hybrid Mode of Tamm and Surface Plasmon Polaritons. Sensors. 2018; 18 (7):2129.
Chicago/Turabian StyleXian Zhang; Xiao-Song Zhu; Yi-Wei Shi. 2018. "An Optical Fiber Refractive Index Sensor Based on the Hybrid Mode of Tamm and Surface Plasmon Polaritons." Sensors 18, no. 7: 2129.
A method for fabricating robust and thin hollow-core optical fibers that carry mid-infrared light is proposed for use in endoscopic laser applications. The fiber is made of stainless steel tubing, eliminating the risk of scattering small glass fragments inside the body if the fiber breaks. To reduce the inner surface roughness of the tubing, a polymer base layer is formed prior to depositing silver and optical-polymer layers that confine light inside the hollow core. The surface roughness is greatly decreased by re-coating thin polymer base layers. Because of this smooth base layer surface, a uniform optical-polymer film can be formed around the core. As a result, clear interference peaks are observed in both the visible and mid-infrared regions. Transmission losses were also low for the carbon dioxide laser used for medical treatments as well as the visible laser diode used for an aiming beam. Measurements of bending losses for these lasers demonstrate the feasibility of the designed fiber for endoscopic applications.
Katsumasa Iwai; Hiroyuki Takaku; Mitsunobu Miyagi; Yi-Wei Shi; Yuji Matsuura. Fabrication of Shatter-Proof Metal Hollow-Core Optical Fibers for Endoscopic Mid-Infrared Laser Applications. Fibers 2018, 6, 24 .
AMA StyleKatsumasa Iwai, Hiroyuki Takaku, Mitsunobu Miyagi, Yi-Wei Shi, Yuji Matsuura. Fabrication of Shatter-Proof Metal Hollow-Core Optical Fibers for Endoscopic Mid-Infrared Laser Applications. Fibers. 2018; 6 (2):24.
Chicago/Turabian StyleKatsumasa Iwai; Hiroyuki Takaku; Mitsunobu Miyagi; Yi-Wei Shi; Yuji Matsuura. 2018. "Fabrication of Shatter-Proof Metal Hollow-Core Optical Fibers for Endoscopic Mid-Infrared Laser Applications." Fibers 6, no. 2: 24.
Stainless pipe is used as the supporting tube for the infrared hollow fiber to obtain high durability and strong mechanical strength. In order to reduce roughness of inner surface of stainless tubes which causes the additional transmission loss, an acrylic-silicon resin material is used as a buffer layer to the inner wall of stainless tube for a low-loss characteristic. For the dielectric inner-coating layer, cyclic olefin polymer (COP) is used to lower the transmission loss. The COP layer is formed by using liquid-phase coating method. The hollow fiber with optimized COP inner film thickness for CO2 laser light were fabricated and reasonable transmission loss was demonstrated.
Katsumasa Iwai; Hiroyuki Takaku; Mitsunobu Miyagi; Yi-Wei Shi; Xiao-Song Zhu; Yuji Matsuura. Transmission properties of dielectric-coated hollow optical fibers based on stainless tube. Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII 2018, 10488, 1048804 .
AMA StyleKatsumasa Iwai, Hiroyuki Takaku, Mitsunobu Miyagi, Yi-Wei Shi, Xiao-Song Zhu, Yuji Matsuura. Transmission properties of dielectric-coated hollow optical fibers based on stainless tube. Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII. 2018; 10488 ():1048804.
Chicago/Turabian StyleKatsumasa Iwai; Hiroyuki Takaku; Mitsunobu Miyagi; Yi-Wei Shi; Xiao-Song Zhu; Yuji Matsuura. 2018. "Transmission properties of dielectric-coated hollow optical fibers based on stainless tube." Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVIII 10488, no. : 1048804.
Flexible hollow fibers with 530-μm-bore size were developed for infrared laser delivery. Sturdy hollow fibers were fabricated by liquid-phase coating techniques. A silica glass capillary is used as the substrate. Acrylic silicone resin is used as a buffer layer and the buffer layer is firstly coated on the inner surface of the capillary to protect the glass tube from chemical damages due to the following silver plating process. A silver layer was inner-plated by using the conventional silver mirror-plating technique. To improve adhesion of catalyst to the buffer layer, a surface conditioner has been introduced in the method of silver mirror-plating technique. We discuss improvement of transmission properties of sturdy polymer-coated silver hollow fibers for the Er:YAG laser and red pilot beam delivery. © (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Katsumasa Iwai; Hiroyuki Takaku; Mitsunobu Miyagi; Yi-Wei Shi; Xiao-Song Zhu; Yuji Matsuura. Improvement of transmission properties of visible pilot beam for polymer-coated silver hollow fibers with acrylic silicone resin as buffer layer for sturdy structure. Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII 2017, 10058, 1005810 .
AMA StyleKatsumasa Iwai, Hiroyuki Takaku, Mitsunobu Miyagi, Yi-Wei Shi, Xiao-Song Zhu, Yuji Matsuura. Improvement of transmission properties of visible pilot beam for polymer-coated silver hollow fibers with acrylic silicone resin as buffer layer for sturdy structure. Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII. 2017; 10058 ():1005810.
Chicago/Turabian StyleKatsumasa Iwai; Hiroyuki Takaku; Mitsunobu Miyagi; Yi-Wei Shi; Xiao-Song Zhu; Yuji Matsuura. 2017. "Improvement of transmission properties of visible pilot beam for polymer-coated silver hollow fibers with acrylic silicone resin as buffer layer for sturdy structure." Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XVII 10058, no. : 1005810.
A new kind of hollow fiber surface plasmon resonance sensor (HF-SPRS) based on the silver-coated ethylene tetra-fluoro-ethylene (ETFE) hollow fiber (HF) is presented. The ETFE HF-SPRS is fabricated, and its performance is investigated experimentally by measuring the transmission spectra of the sensor when filled by liquid sensed media with different refractive indices (RIs). Theoretical analysis based on the ray transmission model is also taken to evaluate the sensor. Because the RI of ETFE is much lower than that of fused silica (FSG), the ETFE HF-SPRS can extend the lower limit of the detection range of the early reported FSG HF-SPRS from 1.5 to 1.42 approximately. This could greatly enhance the application potential of HF-SPRS. Moreover, the joint use of both ETFE and FSG HF-SPRSs can cover a wide detection range from 1.42 to 1.69 approximately with high sensitivities larger than 1000 nm/RIU.
Pan Chen; Yu-Jing He; Xiao-Song Zhu; Yi-Wei Shi. Surface Plasmon Resonance Sensor Based on Ethylene Tetra-Fluoro-Ethylene Hollow Fiber. Sensors 2015, 15, 27917 -27929.
AMA StylePan Chen, Yu-Jing He, Xiao-Song Zhu, Yi-Wei Shi. Surface Plasmon Resonance Sensor Based on Ethylene Tetra-Fluoro-Ethylene Hollow Fiber. Sensors. 2015; 15 (11):27917-27929.
Chicago/Turabian StylePan Chen; Yu-Jing He; Xiao-Song Zhu; Yi-Wei Shi. 2015. "Surface Plasmon Resonance Sensor Based on Ethylene Tetra-Fluoro-Ethylene Hollow Fiber." Sensors 15, no. 11: 27917-27929.
A Raman remote spectroscopy system was established by using flexible hollow fibers (HFs) as laser excitation fiber and signal collection fiber. Experimental evaluations with various optical fiber combinations were carried out. Experiments were conducted by using silver-coated HFs as both remote transmission fiber and sample cells for liquid sample detection. Good linearity for concentration detection of liquid was obtained with clean background and signal enhancement. Theoretical analysis was carried out to optimize the length of the liquid cell. Measured data show good agreement with the simulation result. HF has shown potentiality in applications for remote and noninvasive Raman detection.
Bing-Hong Liu; Yi-Wei Shi. Flexible silver-coated hollow fibers for remote Raman spectroscopic measurements. Applied Optics 2013, 52, 5165 -5170.
AMA StyleBing-Hong Liu, Yi-Wei Shi. Flexible silver-coated hollow fibers for remote Raman spectroscopic measurements. Applied Optics. 2013; 52 (21):5165-5170.
Chicago/Turabian StyleBing-Hong Liu; Yi-Wei Shi. 2013. "Flexible silver-coated hollow fibers for remote Raman spectroscopic measurements." Applied Optics 52, no. 21: 5165-5170.
Xuan Zeng; Bing-Hong Liu; Yu-Jing He; Bang-Shan Sun; Katsumasa Iwai; Mitsunobu Miyagi; Yi-Wei Shi. Fabrication and characterization of AgI/Ag hollow fibers for near-infrared lasers. Optics & Laser Technology 2013, 49, 209 -212.
AMA StyleXuan Zeng, Bing-Hong Liu, Yu-Jing He, Bang-Shan Sun, Katsumasa Iwai, Mitsunobu Miyagi, Yi-Wei Shi. Fabrication and characterization of AgI/Ag hollow fibers for near-infrared lasers. Optics & Laser Technology. 2013; 49 ():209-212.
Chicago/Turabian StyleXuan Zeng; Bing-Hong Liu; Yu-Jing He; Bang-Shan Sun; Katsumasa Iwai; Mitsunobu Miyagi; Yi-Wei Shi. 2013. "Fabrication and characterization of AgI/Ag hollow fibers for near-infrared lasers." Optics & Laser Technology 49, no. : 209-212.
Flexible and low-loss hollow waveguide has many advantages as an absorption cell for spectroscopic gas sensing. The characteristics of the sensing system are dependent on the parameters of the hollow waveguide cell. In this paper, a mathematical model was proposed to analyze the waveguide cell by considering waveguide loss, effective optical path length, and signal-to-noise ratio of the system. Simulation results show that the gas absorption intensity and system sensitivity are dependent not only on the waveguide length but also on the bore-diameter, signal-to-noise ratio, and the concentration of the target gases. The results provide optimizing methods for the sensing system and algorithms for error compensation. Preliminary experiments on concentration detection of methane gas were carried out and measured data showed good agreements with the simulation results.
Jia-Qi Zhou; Wei-Jia Lu; Zhang-Rui Yao; Yu-Qing Wei; Yi-Wei Shi. Optimization of Hollow Waveguides as Absorption Cells for Spectroscopic Gas Sensing. Applied Spectroscopy 2013, 67, 301 -306.
AMA StyleJia-Qi Zhou, Wei-Jia Lu, Zhang-Rui Yao, Yu-Qing Wei, Yi-Wei Shi. Optimization of Hollow Waveguides as Absorption Cells for Spectroscopic Gas Sensing. Applied Spectroscopy. 2013; 67 (3):301-306.
Chicago/Turabian StyleJia-Qi Zhou; Wei-Jia Lu; Zhang-Rui Yao; Yu-Qing Wei; Yi-Wei Shi. 2013. "Optimization of Hollow Waveguides as Absorption Cells for Spectroscopic Gas Sensing." Applied Spectroscopy 67, no. 3: 301-306.
A Raman remote spectroscopy system was realized using flexible hollow optical fiber as laser emittion and signal collection probes. A silver-coated hollow fiber has low-loss property and flat transmission characteristics in the visible wavelength regions. Compared with conventional silica optical fiber, little background fluorescence noise was observed with optical fiber as the probe, which would be of great advantages to the detection in low frequency Raman shift region. The complex filtering and focusing system was thus unnecessary. The Raman spectra of CaCO3 and PE were obtained by using the system and a reasonable signal to noise ratio was attained without any lens. Experiments with probes made of conventional silica optical fibers were also conducted for comparisons. Furthermore, a silver-coated hollow glass waveguide was used as sample cell to detect liquid phase sample. We used a 6 cm-long hollow fiber as the liquid cell and Butt-couplings with emitting and collecting fibers. Experiment results show that the system obtained high signal to noise ratio because of the longer optical length between sample and laser light. We also give the elementary theoretical analysis for the hollow fiber sample cell. The parameters of the fiber which would affect the system were discussed. Hollow fiber has shown to be a potential fiber probe or sample cell for Raman spectroscopy.
Bing-Hong Liu; Yi-Wei Shi. Raman spectroscopy system with hollow fiber probes. Photonics Asia 2012, 8552, 1 .
AMA StyleBing-Hong Liu, Yi-Wei Shi. Raman spectroscopy system with hollow fiber probes. Photonics Asia. 2012; 8552 ():1.
Chicago/Turabian StyleBing-Hong Liu; Yi-Wei Shi. 2012. "Raman spectroscopy system with hollow fiber probes." Photonics Asia 8552, no. : 1.
Dielectric-coated metallic hollow waveguides (DMHW) are drawing considerable attention for their application in terahertz (THz) waveguiding. This paper theoretically analyzes the multilayer structure to reduce the transmission and bending loss of DMHW. The efficiency of THz multilayer DMHW depends on a proper selection of dielectric materials and geometrical parameters. The low-loss properties are demonstrated by studying the multilayer gold waveguides with a stack of polypropylene (PP) and Si-doped polypropylene (PP(Si)). Comparisons are made with single-layer Au/PP and Au-only waveguides. The effect of dielectric absorption is discussed in detail. It is found that low index dielectric causes more additional loss than that of high index dielectric layers. Several design considerations for the THz multilayer DMHW are pointed out by studying the effects of multilayer structure parameters with a stack of polyethylene (PE) and TiO(2)-doped polyethylene (PE(TiO2)). We conclude that the inner radius of the waveguide and the refractive indices of the dielectrics tend to be larger in order to reduce the influence of material absorption. An optimal value exists for the total number of layers when the dielectrics are absorptive. The absorption tolerances are pointed out to guarantee a smaller loss for multilayer DMHW than that of metal-only waveguide. Finally, a fabrication method for THz multilayer DMHW Ag/PE/PE(TiO2) is proposed based on co-rolling technique.
Bang-Shan Sun; Xiao-Li Tang; Xuan Zeng; Yi-Wei Shi. Characterization of cylindrical terahertz metallic hollow waveguide with multiple dielectric layers. Applied Optics 2012, 51, 7276 -7285.
AMA StyleBang-Shan Sun, Xiao-Li Tang, Xuan Zeng, Yi-Wei Shi. Characterization of cylindrical terahertz metallic hollow waveguide with multiple dielectric layers. Applied Optics. 2012; 51 (30):7276-7285.
Chicago/Turabian StyleBang-Shan Sun; Xiao-Li Tang; Xuan Zeng; Yi-Wei Shi. 2012. "Characterization of cylindrical terahertz metallic hollow waveguide with multiple dielectric layers." Applied Optics 51, no. 30: 7276-7285.
An erratum is presented to correct the power coupling efficiencies of the incident beam to the fiber modes.
Xiao-Li Tang; Bang-Shan Sun; Yi-Wei Shi. Design and optimization of low-loss high-birefringence hollow fiber at terahertz frequency: erratum. Optics Express 2012, 20, 12212 .
AMA StyleXiao-Li Tang, Bang-Shan Sun, Yi-Wei Shi. Design and optimization of low-loss high-birefringence hollow fiber at terahertz frequency: erratum. Optics Express. 2012; 20 (11):12212.
Chicago/Turabian StyleXiao-Li Tang; Bang-Shan Sun; Yi-Wei Shi. 2012. "Design and optimization of low-loss high-birefringence hollow fiber at terahertz frequency: erratum." Optics Express 20, no. 11: 12212.
Wei Tan; Yu-Jing He; Cong-Hui Yang; Yi-Wei Shi. Remote measuring system for infrared spectral features using hollow fiber probe. Journal of Infrared and Millimeter Waves 2012, 31, 148 -152.
AMA StyleWei Tan, Yu-Jing He, Cong-Hui Yang, Yi-Wei Shi. Remote measuring system for infrared spectral features using hollow fiber probe. Journal of Infrared and Millimeter Waves. 2012; 31 (2):148-152.
Chicago/Turabian StyleWei Tan; Yu-Jing He; Cong-Hui Yang; Yi-Wei Shi. 2012. "Remote measuring system for infrared spectral features using hollow fiber probe." Journal of Infrared and Millimeter Waves 31, no. 2: 148-152.