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Francois Blanchard
Département de génie électrique, École de Technologie Superieure (ÉTS), Montréal, Canada

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Journal article
Published: 17 June 2021 in Optics Express
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The engineering of optomechanical systems has exploded over the past decades, with many geometries and applications arising from the coupling of light with mechanical motion. The modulation of electromagnetic radiation in the terahertz (THz) frequency range through optomechanical systems is no exception to this research effort. However, some fundamental modulation capabilities for THz communications and/or high-speed data processing applications are yet to be established. Here, we demonstrate a THz time-domain derivative spectrometer based on a piezoelectric micromachined (PM) device. Insertion of the PM device into the THz beam path provides reference modulation for the lock-in detection unit, which in turn provides access to the nth-order derivative information of the incoming THz signal. Strikingly, the integration of the recorded derived signal leads to a recovered reference signal with an equivalent or even better signal-to-noise ratio, opening the door to a new type of highly sensitive THz measurements in the time domain.

ACS Style

Fatemeh Amirkhan; Mathieu Gratuze; Xavier Ropagnol; Tsuneyuki Ozaki; Frédéric Nabki; Francois Blanchard. Terahertz time-domain derivative spectrometer using a large-aperture piezoelectric micromachined device. Optics Express 2021, 29, 22096 -22107.

AMA Style

Fatemeh Amirkhan, Mathieu Gratuze, Xavier Ropagnol, Tsuneyuki Ozaki, Frédéric Nabki, Francois Blanchard. Terahertz time-domain derivative spectrometer using a large-aperture piezoelectric micromachined device. Optics Express. 2021; 29 (14):22096-22107.

Chicago/Turabian Style

Fatemeh Amirkhan; Mathieu Gratuze; Xavier Ropagnol; Tsuneyuki Ozaki; Frédéric Nabki; Francois Blanchard. 2021. "Terahertz time-domain derivative spectrometer using a large-aperture piezoelectric micromachined device." Optics Express 29, no. 14: 22096-22107.

Journal article
Published: 04 April 2020 in Fibers
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The stable propagation of orbital angular momentum and cylindrical vector beams in a newly designed annular core photonic crystal fiber (AC-PCF) tailored for the broadband single-radial order beam transmission (within the so-called “endlessly mono-radial” guiding regime) is demonstrated for the first time. It is shown that the vector-vortex beams can maintain high mode purities above 18 dB after propagation in the fiber under test over all of the wavelength range from 805 to 845 nm (over 17 THz bandwidth) investigated with the help of a tunable laser and an S-plate for the generation of singular beams in free space. Our results confirm that the AC-PCF is a promising design for the broadband transmission of vector-vortex beams that have potential applications in space-division multiplexing, quantum communications, optical sensing and trapping.

ACS Style

Manish Sharma; Fatemeh Amirkhan; Satyendra K. Mishra; Dipankar Sengupta; Younès Messaddeq; François Blanchard; Bora Ung. Transmission of Orbital Angular Momentum and Cylindrical Vector Beams in a Large-Bandwidth Annular Core Photonic Crystal Fiber. Fibers 2020, 8, 22 .

AMA Style

Manish Sharma, Fatemeh Amirkhan, Satyendra K. Mishra, Dipankar Sengupta, Younès Messaddeq, François Blanchard, Bora Ung. Transmission of Orbital Angular Momentum and Cylindrical Vector Beams in a Large-Bandwidth Annular Core Photonic Crystal Fiber. Fibers. 2020; 8 (4):22.

Chicago/Turabian Style

Manish Sharma; Fatemeh Amirkhan; Satyendra K. Mishra; Dipankar Sengupta; Younès Messaddeq; François Blanchard; Bora Ung. 2020. "Transmission of Orbital Angular Momentum and Cylindrical Vector Beams in a Large-Bandwidth Annular Core Photonic Crystal Fiber." Fibers 8, no. 4: 22.

Conference paper
Published: 01 January 2020 in OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF)
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We report on the electro-optical (EO) detection of subpicosecond terahertz (THz) pulses using a cut non-centrosymmetryc crystal of zinc sulphide (ZnS). Its EO efficiency, using the second harmonic generation (SHG) of an Ytterbium (Yb) laser (514 nm,) is compared to the EO efficiency using a cut crystal of cadmium telluride (CdTe) at the fundamental wavelength of the laser (1028 nm).

ACS Style

Joel Edouard Nkeck; Xavier Ropagnol; Riad Nechache; François Blanchard. Electro-optic detection of terahertz radiation using a zinc sulfide crystal probed by the second harmonic of an Ytterbium laser. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) 2020, NpM4D.2 .

AMA Style

Joel Edouard Nkeck, Xavier Ropagnol, Riad Nechache, François Blanchard. Electro-optic detection of terahertz radiation using a zinc sulfide crystal probed by the second harmonic of an Ytterbium laser. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF). 2020; ():NpM4D.2.

Chicago/Turabian Style

Joel Edouard Nkeck; Xavier Ropagnol; Riad Nechache; François Blanchard. 2020. "Electro-optic detection of terahertz radiation using a zinc sulfide crystal probed by the second harmonic of an Ytterbium laser." OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) , no. : NpM4D.2.

Conference paper
Published: 01 January 2020 in OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF)
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We report on low frequency terahertz near-field imaging using a wide field of view electro-optical sampling method. The sample consists of a printed metal checkerboard and is resolved with a spatial resolution of λ/35 at 220 GHz.

ACS Style

L. Guiramand; M. Zhuldybina; T. Arikawa; K. Tanaka; F. Blanchard. Near-field THz imaging of a printed metallic checkerboard pattern. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) 2020, NpTu4D.16 .

AMA Style

L. Guiramand, M. Zhuldybina, T. Arikawa, K. Tanaka, F. Blanchard. Near-field THz imaging of a printed metallic checkerboard pattern. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF). 2020; ():NpTu4D.16.

Chicago/Turabian Style

L. Guiramand; M. Zhuldybina; T. Arikawa; K. Tanaka; F. Blanchard. 2020. "Near-field THz imaging of a printed metallic checkerboard pattern." OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) , no. : NpTu4D.16.

Conference paper
Published: 01 January 2020 in OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF)
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We propose a simple method to differentiate a THz pulse using a piezoelectric micromachined ultrasonic transducer (PMUT). We demonstrate with simulations that the modulated THz signal after PMUT is proportional to the first-order derivative of the THz pulse.

ACS Style

F. Amirkhan; A. Robichaud; X. Ropagnol; M. Gratuze; T. Ozaki; F. Nabki; F. Blanchard. Simulation study of a piezoelectric micromachined ultrasonic transducer as terahertz differentiator. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) 2020, NoM4C.5 .

AMA Style

F. Amirkhan, A. Robichaud, X. Ropagnol, M. Gratuze, T. Ozaki, F. Nabki, F. Blanchard. Simulation study of a piezoelectric micromachined ultrasonic transducer as terahertz differentiator. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF). 2020; ():NoM4C.5.

Chicago/Turabian Style

F. Amirkhan; A. Robichaud; X. Ropagnol; M. Gratuze; T. Ozaki; F. Nabki; F. Blanchard. 2020. "Simulation study of a piezoelectric micromachined ultrasonic transducer as terahertz differentiator." OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) , no. : NoM4C.5.

Conference paper
Published: 01 January 2020 in OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF)
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We evaluated an analysis technique based on the uses of two THz frequency bands for the quality control of printed electronics. Our analysis does not depend on the phase information and could be coupled with compact continuous wave THz sources. After a proper calibration, this method can be implemented as a simple technique for industrial environment purpose.

ACS Style

M. Zhuldybina; X. Ropagnol; C. Bois; R. J. Zednik; F. Blanchard. Perspectives of Using Two Terahertz Frequencies for Industrial Quality Control of Printable Electronics. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) 2020, NoM4C.2 .

AMA Style

M. Zhuldybina, X. Ropagnol, C. Bois, R. J. Zednik, F. Blanchard. Perspectives of Using Two Terahertz Frequencies for Industrial Quality Control of Printable Electronics. OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF). 2020; ():NoM4C.2.

Chicago/Turabian Style

M. Zhuldybina; X. Ropagnol; C. Bois; R. J. Zednik; F. Blanchard. 2020. "Perspectives of Using Two Terahertz Frequencies for Industrial Quality Control of Printable Electronics." OSA Advanced Photonics Congress (AP) 2020 (IPR, NP, NOMA, Networks, PVLED, PSC, SPPCom, SOF) , no. : NoM4C.2.

Journal article
Published: 29 August 2019 in Journal of the Optical Society of America B
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We present a new method to characterize thin-film electro-optic materials. The method is based on resolving the electric and/or magnetic field distributions in the near-field region of a split-ring resonator (SRR) designed for the terahertz (THz) frequency range. We experimentally validate our simulations by THz near-field imaging of SRRs directly patterned in contact with a thin-film lithium niobate crystal as a sensor. Furthermore, we analytically study the effect of the different applied electric field polarizations and calculate the sensitivity of the sensor via various polarizations of probe beams.

ACS Style

F. Amirkhan; R. Sakata; K. Takiguchi; T. Arikawa; T. Ozaki; K. Tanaka; F. Blanchard. Characterization of thin-film optical properties by THz near-field imaging method. Journal of the Optical Society of America B 2019, 36, 2593 -2601.

AMA Style

F. Amirkhan, R. Sakata, K. Takiguchi, T. Arikawa, T. Ozaki, K. Tanaka, F. Blanchard. Characterization of thin-film optical properties by THz near-field imaging method. Journal of the Optical Society of America B. 2019; 36 (9):2593-2601.

Chicago/Turabian Style

F. Amirkhan; R. Sakata; K. Takiguchi; T. Arikawa; T. Ozaki; K. Tanaka; F. Blanchard. 2019. "Characterization of thin-film optical properties by THz near-field imaging method." Journal of the Optical Society of America B 36, no. 9: 2593-2601.

Communication
Published: 21 June 2019 in Applied Sciences
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Cost effective imaging is required for a wide range of scientific and engineering applications. For electromagnetic waves in the terahertz (THz) frequency range, a key missing element that has prevented widespread applications in this spectral range is an inexpensive and efficient imaging device. In recent years, vanadium oxide based thermal sensors have rapidly entered the market for night vision capability. At the same time, sensors based on this technology have been applied to the THz domain, but with two orders of magnitude larger pricing range. Here we show that, with a simple modification, a commercially available thermal imaging camera can function as a THz imaging device. By comparing a commercially available THz camera and this low-cost device, we identify the main sensitivity difference is not attributed to anything intrinsic to the devices, but rather to the analog-to-digital converter and dynamic background subtraction capability. This demonstration of a low-cost THz camera may aid in the rapid development of affordable THz imaging solutions for industrial and scientific applications.

ACS Style

François Blanchard; Joel Edouard Nkeck; Dominique Matte; Riad Nechache; David G. Cooke. A Low-Cost Terahertz Camera. Applied Sciences 2019, 9, 2531 .

AMA Style

François Blanchard, Joel Edouard Nkeck, Dominique Matte, Riad Nechache, David G. Cooke. A Low-Cost Terahertz Camera. Applied Sciences. 2019; 9 (12):2531.

Chicago/Turabian Style

François Blanchard; Joel Edouard Nkeck; Dominique Matte; Riad Nechache; David G. Cooke. 2019. "A Low-Cost Terahertz Camera." Applied Sciences 9, no. 12: 2531.

Preprint
Published: 28 January 2019
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Printed electronic devices are attracting significant interest due to their versatility and low cost; however, quality control during manufacturing is a significant challenge, preventing the widespread adoption of this promising technology. We show that terahertz (THz) radiation can be used for the in situ inspection of printed electronic devices, as confirmed through a comparison with conventional electrical conductivity methods. Our in situ method consists of printing a simple test pattern exhibiting a distinct signature in the THz range that enables the precise characterization of {the static} electrical conductivities of the printed ink. We demonstrate that contactless dual-wavelength THz spectroscopy analysis, which requires only a single THz measurement, is more precise and repeatable than the conventional four-point probe conductivity measurement method. Our results open the door to a simple strategy for performing contactless quality control in real time of printed electronic devices at any stage of its production line.

ACS Style

Mariia Zhuldybina; Xavier Ropagnol; Charles Trudeau; Martin Bolduc; Ricardo J. Zednik; François Blanchard. Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy. 2019, 1 .

AMA Style

Mariia Zhuldybina, Xavier Ropagnol, Charles Trudeau, Martin Bolduc, Ricardo J. Zednik, François Blanchard. Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy. . 2019; ():1.

Chicago/Turabian Style

Mariia Zhuldybina; Xavier Ropagnol; Charles Trudeau; Martin Bolduc; Ricardo J. Zednik; François Blanchard. 2019. "Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy." , no. : 1.

Journal article
Published: 22 January 2019 in Sensors
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Printed electronic devices are attracting significant interest due to their versatility and low cost; however, quality control during manufacturing is a significant challenge, preventing the widespread adoption of this promising technology. We show that terahertz (THz) radiation can be used for the in situ inspection of printed electronic devices, as confirmed through a comparison with conventional electrical conductivity methods. Our in situ method consists of printing a simple test pattern exhibiting a distinct signature in the THz range that enables the precise characterization of the static electrical conductivities of the printed ink. We demonstrate that contactless dual-wavelength THz spectroscopy analysis, which requires only a single THz measurement, is more precise and repeatable than the conventional four-point probe conductivity measurement method. Our results open the door to a simple strategy for performing contactless quality control in real time of printed electronic devices at any stage of its production line.

ACS Style

Mariia Zhuldybina; Xavier Ropagnol; Charles Trudeau; Martin Bolduc; Ricardo J. Zednik; François Blanchard. Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy. Sensors 2019, 19, 444 .

AMA Style

Mariia Zhuldybina, Xavier Ropagnol, Charles Trudeau, Martin Bolduc, Ricardo J. Zednik, François Blanchard. Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy. Sensors. 2019; 19 (3):444.

Chicago/Turabian Style

Mariia Zhuldybina; Xavier Ropagnol; Charles Trudeau; Martin Bolduc; Ricardo J. Zednik; François Blanchard. 2019. "Contactless In Situ Electrical Characterization Method of Printed Electronic Devices with Terahertz Spectroscopy." Sensors 19, no. 3: 444.

Journal article
Published: 09 October 2018 in Optics Letters
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Terahertz (THz) imaging is currently based on linear effects, but there is great interest on how nonlinear effects induced by terahertz radiation could be exploited to provide extra information that is unobtainable by conventional imaging schemes. In particular, at field strengths on the order of 100 kV cm−1 to 1 MV cm−1, transmission properties inside semiconductor materials are largely affected at the picosecond time-scale, which raise the prospect of interesting nonlinear imaging applications at THz frequencies. Here, we experimentally investigate a method to map the two-dimensional nonlinear near-field distribution of an intense THz pulse passing through a thin film-doped semiconductor. By inserting a metamaterial structure between the electro-optic sensor and the doped film, the nonlinear near-field dynamics shows a different and enhanced contrast of the sample when compared to its linear counterpart.

ACS Style

François Blanchard; Xin Chai; Tomoko Tanaka; Takashi Arikawa; Tsuneyuki Ozaki; Roberto Morandotti; Koichiro Tanaka. Terahertz microscopy assisted by semiconductor nonlinearities. Optics Letters 2018, 43, 4997 -5000.

AMA Style

François Blanchard, Xin Chai, Tomoko Tanaka, Takashi Arikawa, Tsuneyuki Ozaki, Roberto Morandotti, Koichiro Tanaka. Terahertz microscopy assisted by semiconductor nonlinearities. Optics Letters. 2018; 43 (20):4997-5000.

Chicago/Turabian Style

François Blanchard; Xin Chai; Tomoko Tanaka; Takashi Arikawa; Tsuneyuki Ozaki; Roberto Morandotti; Koichiro Tanaka. 2018. "Terahertz microscopy assisted by semiconductor nonlinearities." Optics Letters 43, no. 20: 4997-5000.

Journal article
Published: 25 April 2018 in Optics Letters
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We report a new method to temporally and spatially manipulate the pulse front tilt (PFT) intensity profile of an ultrashort optical pulse using a commercial microelectromechanical system, also known as a digital micromirror device (DMD). For our demonstration, we show terahertz generation in a lithium niobate crystal using the PFT pumping scheme derived from a DMD chip. The adaptive functionality of the DMD could be a convenient alternative to the more conventional grating required to generate a laser beam with a PFT intensity profile that is typically used for efficient optical rectification in noncollinear phase-matching conditions. In contrast to a grating, PFT using DMD does not suffer from wavelength dispersion, and exhibits overlap properties between grating and a stair-step echelon mirror.

ACS Style

Kosuke Murate; Mehraveh Javan Roshtkhari; Xavier Ropagnol; François Blanchard. Adaptive spatiotemporal optical pulse front tilt using a digital micromirror deviceand its terahertz application. Optics Letters 2018, 43, 2090 -2093.

AMA Style

Kosuke Murate, Mehraveh Javan Roshtkhari, Xavier Ropagnol, François Blanchard. Adaptive spatiotemporal optical pulse front tilt using a digital micromirror deviceand its terahertz application. Optics Letters. 2018; 43 (9):2090-2093.

Chicago/Turabian Style

Kosuke Murate; Mehraveh Javan Roshtkhari; Xavier Ropagnol; François Blanchard. 2018. "Adaptive spatiotemporal optical pulse front tilt using a digital micromirror deviceand its terahertz application." Optics Letters 43, no. 9: 2090-2093.

Conference paper
Published: 01 January 2018 in Conference on Lasers and Electro-Optics
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We performed time-resolved terahertz near-field imaging of a gold disk with sub-wavelength periodic grooves and successfully observed spoof localized surface plasmons. A selective excitation method is also demonstrated with orbital angular momentum of light.

ACS Style

Takashi Arikawa; Shohei Morimoto; Tomoki Hiraoka; François Blanchard; Kyosuke Sakai; Keiji Sasaki; Koichiro Tanaka. Control of Spoof Localized Surface Plasmons Using Terahertz Near-field Microscope. Conference on Lasers and Electro-Optics 2018, SW3D.6 .

AMA Style

Takashi Arikawa, Shohei Morimoto, Tomoki Hiraoka, François Blanchard, Kyosuke Sakai, Keiji Sasaki, Koichiro Tanaka. Control of Spoof Localized Surface Plasmons Using Terahertz Near-field Microscope. Conference on Lasers and Electro-Optics. 2018; ():SW3D.6.

Chicago/Turabian Style

Takashi Arikawa; Shohei Morimoto; Tomoki Hiraoka; François Blanchard; Kyosuke Sakai; Keiji Sasaki; Koichiro Tanaka. 2018. "Control of Spoof Localized Surface Plasmons Using Terahertz Near-field Microscope." Conference on Lasers and Electro-Optics , no. : SW3D.6.

Journal article
Published: 03 October 2016 in Optics Letters
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In this Letter, we present a significant improvement to time and space resolutions in electro-optic sampling (EO) for two-dimensional terahertz (THz) near-field imaging. Using a THz microscope, we readapt a recent EO sampling scheme based on optical probe spectrum filtering. Combined with an ultra-thin EO crystal, we achieve record broadband video-rate THz near-field imaging. Particularly, this new scheme improves the THz bandwidth, the imaging contrast, and the spatial resolution. To validate our method, we show THz near-field images ranging from 100 GHz to 4 THz with a spatial resolution up to λ/600 at 100 GHz. This demonstration positively affects the detection of intense THz pulses derived from the tilted-pulse-front excitation of lithium niobate and will accelerate our understanding of the interaction processes between electromagnetic waves and the conducting electrons of metallic interfaces.

ACS Style

François Blanchard; Koichiro Tanaka. Improving time and space resolution in electro-optic sampling for near-field terahertz imaging. Optics Letters 2016, 41, 4645 .

AMA Style

François Blanchard, Koichiro Tanaka. Improving time and space resolution in electro-optic sampling for near-field terahertz imaging. Optics Letters. 2016; 41 (20):4645.

Chicago/Turabian Style

François Blanchard; Koichiro Tanaka. 2016. "Improving time and space resolution in electro-optic sampling for near-field terahertz imaging." Optics Letters 41, no. 20: 4645.

Article
Published: 16 January 2015 in Physical Review B
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We report nonlinear terahertz (THz) field transmission through photoexcited monolayer epitaxial graphene via differential transmission measurements enabled by optical-pump/intense-terahertz-probe (OPITP) spectroscopy. After photoexcitation of graphene, a transmission enhancement, defined by a positive differential transmission of the intense terahertz probe pulse, is observed. This is due to suppression of the graphene photoconductivity arising from an increased carrier scattering rate due to the increase in the carrier density and the extra energy from the photoexcited hot carriers. Thus, the transient enhancement in transmission increases as the optical pump fluence increased. Most interestingly, we observe that the transmission enhancement after photoexcitation decreases as the THz field strength is increased, which we attribute to the combined effects of the intense THz electric field and the optical pump fluence on the carrier scattering rate. We model the carrier dynamics in the graphene using the length gauge interaction Hamiltonian with the inclusion of short-range scattering by neutral impurities and the interaction of the carriers with optical phonons. Comparing the experimental and simulated transmission results, we extract the nonequilibrium effective lattice temperature of graphene as a function of the optical pump fluence and THz field strength.

ACS Style

Hassan A. Hafez; Ibraheem Al-Naib; Marc M. Dignam; Yoshiaki Sekine; Katsuya Oguri; François Blanchard; David G. Cooke; Satoru Tanaka; Fumio Komori; Hiroki Hibino; Tsuneyuki Ozaki. Nonlinear terahertz field-induced carrier dynamics in photoexcited epitaxial monolayer graphene. Physical Review B 2015, 91, 035422 .

AMA Style

Hassan A. Hafez, Ibraheem Al-Naib, Marc M. Dignam, Yoshiaki Sekine, Katsuya Oguri, François Blanchard, David G. Cooke, Satoru Tanaka, Fumio Komori, Hiroki Hibino, Tsuneyuki Ozaki. Nonlinear terahertz field-induced carrier dynamics in photoexcited epitaxial monolayer graphene. Physical Review B. 2015; 91 (3):035422.

Chicago/Turabian Style

Hassan A. Hafez; Ibraheem Al-Naib; Marc M. Dignam; Yoshiaki Sekine; Katsuya Oguri; François Blanchard; David G. Cooke; Satoru Tanaka; Fumio Komori; Hiroki Hibino; Tsuneyuki Ozaki. 2015. "Nonlinear terahertz field-induced carrier dynamics in photoexcited epitaxial monolayer graphene." Physical Review B 91, no. 3: 035422.

Conference paper
Published: 01 January 2014 in Conference on Lasers and Electro-Optics
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We investigate the terahertz generation efficiency dependence as function of the pulse width durations at 800 nm. Our results confirmed conversion efficiency of 0.35% with saturation at 240 fs of pulse width duration.

ACS Style

François Blanchard; Hadi Razavipour; Hassan Hafez; Xavier Ropagnol; Martin Bolduc; Roberto Morandotti; Tsuneyuki Ozaki; David G. Cooke. Scaling up of intense terahertz pulses pumped with 800 nm light pulse. Conference on Lasers and Electro-Optics 2014, SW1F.4 .

AMA Style

François Blanchard, Hadi Razavipour, Hassan Hafez, Xavier Ropagnol, Martin Bolduc, Roberto Morandotti, Tsuneyuki Ozaki, David G. Cooke. Scaling up of intense terahertz pulses pumped with 800 nm light pulse. Conference on Lasers and Electro-Optics. 2014; ():SW1F.4.

Chicago/Turabian Style

François Blanchard; Hadi Razavipour; Hassan Hafez; Xavier Ropagnol; Martin Bolduc; Roberto Morandotti; Tsuneyuki Ozaki; David G. Cooke. 2014. "Scaling up of intense terahertz pulses pumped with 800 nm light pulse." Conference on Lasers and Electro-Optics , no. : SW1F.4.

Conference paper
Published: 01 January 2014 in Conference on Lasers and Electro-Optics
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We probe porous metal-organic framework materials (MOFs) using broadband terahertz (THz) pulses. Water molecules that are absorbed by the pores of the material display intermolecular dynamics differing from those of free water.

ACS Style

Christian Wolpert; Kenji Sumida; François Blanchard; Koichiro Tanaka. Probing Hydration Dynamics of Metal-Organic Frameworks by Broadband THz Pulses. Conference on Lasers and Electro-Optics 2014, SF1F.1 .

AMA Style

Christian Wolpert, Kenji Sumida, François Blanchard, Koichiro Tanaka. Probing Hydration Dynamics of Metal-Organic Frameworks by Broadband THz Pulses. Conference on Lasers and Electro-Optics. 2014; ():SF1F.1.

Chicago/Turabian Style

Christian Wolpert; Kenji Sumida; François Blanchard; Koichiro Tanaka. 2014. "Probing Hydration Dynamics of Metal-Organic Frameworks by Broadband THz Pulses." Conference on Lasers and Electro-Optics , no. : SF1F.1.

Article
Published: 17 October 2012 in Physical Review Letters
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We investigated ultrafast carrier dynamics in graphene with near-infrared transient absorption measurement after intense half-cycle terahertz pulse excitation. The terahertz electric field efficiently drives the carriers, inducing large transparency in the near-infrared region. Theoretical calculations using the Boltzmann transport equation quantitatively reproduce the experimental findings. This good agreement suggests that the intense terahertz field should promote a remarkable impact ionization process and increase the carrier density. DOI: http://dx.doi.org/10.1103/PhysRevLett.109.166603 © 2012 American Physical Society

ACS Style

Shuntaro Tani; François Blanchard; Koichiro Tanaka. Ultrafast Carrier Dynamics in Graphene under a High Electric Field. Physical Review Letters 2012, 109, 166603 .

AMA Style

Shuntaro Tani, François Blanchard, Koichiro Tanaka. Ultrafast Carrier Dynamics in Graphene under a High Electric Field. Physical Review Letters. 2012; 109 (16):166603.

Chicago/Turabian Style

Shuntaro Tani; François Blanchard; Koichiro Tanaka. 2012. "Ultrafast Carrier Dynamics in Graphene under a High Electric Field." Physical Review Letters 109, no. 16: 166603.

Preprint
Published: 07 June 2012
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We investigated ultrafast carrier dynamics in graphene with near-infrared transient absorption measurement after intense half-cycle terahertz pulse excitation. The terahertz electric field efficiently drives the carriers, inducing large transparency in the near-infrared region. Theoretical calculations using the Boltzmann transport equation quantitatively reproduce the experimental findings. This good agreement suggests that the intense terahertz field should promote remarkable impact ioniza- tion process, which leads to suppression of optical phonon emission and results in efficient carrier transport in graphene.

ACS Style

Shuntaro Tani; Francois Blanchard; Koichiro Tanaka. Terahertz radiation induced ballistic electron transport in graphene. 2012, 1 .

AMA Style

Shuntaro Tani, Francois Blanchard, Koichiro Tanaka. Terahertz radiation induced ballistic electron transport in graphene. . 2012; ():1.

Chicago/Turabian Style

Shuntaro Tani; Francois Blanchard; Koichiro Tanaka. 2012. "Terahertz radiation induced ballistic electron transport in graphene." , no. : 1.

Conference paper
Published: 01 January 2010 in Conference on Lasers and Electro-Optics
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We study ultrafast hot electron transport in n-doped InGaAs using polarization-sensitive nonlinear THz-pump/THz-probe spectroscopy. We observe an anisotropic effective mass for hot electrons due to the nonparabolicity of the conduction band.

ACS Style

François Blanchard; F. H. Su; Luca Razzari; Gargi Sharma; Roberto Morandotti; Tsuneyuki Ozaki; Matt Reid; F. A. Hegmann. Anisotropy of hot electron effective mass in n-doped InGaAs revealed by nonlinear THz-pump/THz-probe spectroscopy. Conference on Lasers and Electro-Optics 2010, CMP6 .

AMA Style

François Blanchard, F. H. Su, Luca Razzari, Gargi Sharma, Roberto Morandotti, Tsuneyuki Ozaki, Matt Reid, F. A. Hegmann. Anisotropy of hot electron effective mass in n-doped InGaAs revealed by nonlinear THz-pump/THz-probe spectroscopy. Conference on Lasers and Electro-Optics. 2010; ():CMP6.

Chicago/Turabian Style

François Blanchard; F. H. Su; Luca Razzari; Gargi Sharma; Roberto Morandotti; Tsuneyuki Ozaki; Matt Reid; F. A. Hegmann. 2010. "Anisotropy of hot electron effective mass in n-doped InGaAs revealed by nonlinear THz-pump/THz-probe spectroscopy." Conference on Lasers and Electro-Optics , no. : CMP6.