The Experts below are selected from a list of 61122 Experts worldwide ranked by ideXlab platform
Guilhem Gallot - One of the best experts on this subject based on the ideXlab platform.
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Achromatic polarizing elements for pulsed THz waves
2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present two polarizing elements designed to produce Linear and circular polarization for broadband, pulsed THz waves. The Linear Polarizer is made out silicon wafers arranged at Brewster's angle and the circular Polarizer is made out of a silicon prism using total internal reflection differential phase-shift effect.
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brewster s angle silicon wafer terahertz Linear Polarizer
Optics Express, 2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present a new cost-effective terahertz Linear Polarizer made from a stack of silicon wafers at Brewster's angle, andevaluate its performances. We show that this Polarizer is wide-band, has a high extinction ratio (> 6 × 10(3)) and very small insertion losses (< 1%). We provide measurements of the temporal waveforms after Linearly polarizing the THz beam and show that there is no distortion of the pulse. We compare its performances with a commercial wire-grid Polarizer, and show that the Brewster's angle Polarizer can conveniently be used to control the power of a terahertz beam.
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Brewster’s angle silicon wafer terahertz Linear Polarizer
Optics express, 2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present a new cost-effective terahertz Linear Polarizer made from a stack of silicon wafers at Brewster's angle, andevaluate its performances. We show that this Polarizer is wide-band, has a high extinction ratio (> 6 × 10(3)) and very small insertion losses (< 1%). We provide measurements of the temporal waveforms after Linearly polarizing the THz beam and show that there is no distortion of the pulse. We compare its performances with a commercial wire-grid Polarizer, and show that the Brewster's angle Polarizer can conveniently be used to control the power of a terahertz beam.
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Brewster's angle silicon wafer terahertz Linear Polarizer
Optics Express, 2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present a new cost-effective terahertz Linear Polarizer made from a stack of silicon wafers at Brewster's angle, andevaluate its performances. We show that this Polarizer is wide-band, has a high extinction ratio (> 6 × 103) and very small insertion losses (inf 1%). We provide measurements of the temporal waveforms after Linearly polarizing the THz beam and show that there is no distortion of the pulse. We compare its performances with a commercial wire-grid Polarizer, and show that the Brewster's angle Polarizer can conveniently be used to control the power of a terahertz beam. Cop. 2011 Optical Society of America.
Antoine Wojdyla - One of the best experts on this subject based on the ideXlab platform.
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Achromatic polarizing elements for pulsed THz waves
2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present two polarizing elements designed to produce Linear and circular polarization for broadband, pulsed THz waves. The Linear Polarizer is made out silicon wafers arranged at Brewster's angle and the circular Polarizer is made out of a silicon prism using total internal reflection differential phase-shift effect.
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brewster s angle silicon wafer terahertz Linear Polarizer
Optics Express, 2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present a new cost-effective terahertz Linear Polarizer made from a stack of silicon wafers at Brewster's angle, andevaluate its performances. We show that this Polarizer is wide-band, has a high extinction ratio (> 6 × 10(3)) and very small insertion losses (< 1%). We provide measurements of the temporal waveforms after Linearly polarizing the THz beam and show that there is no distortion of the pulse. We compare its performances with a commercial wire-grid Polarizer, and show that the Brewster's angle Polarizer can conveniently be used to control the power of a terahertz beam.
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Brewster’s angle silicon wafer terahertz Linear Polarizer
Optics express, 2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present a new cost-effective terahertz Linear Polarizer made from a stack of silicon wafers at Brewster's angle, andevaluate its performances. We show that this Polarizer is wide-band, has a high extinction ratio (> 6 × 10(3)) and very small insertion losses (< 1%). We provide measurements of the temporal waveforms after Linearly polarizing the THz beam and show that there is no distortion of the pulse. We compare its performances with a commercial wire-grid Polarizer, and show that the Brewster's angle Polarizer can conveniently be used to control the power of a terahertz beam.
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Brewster's angle silicon wafer terahertz Linear Polarizer
Optics Express, 2011Co-Authors: Antoine Wojdyla, Guilhem GallotAbstract:We present a new cost-effective terahertz Linear Polarizer made from a stack of silicon wafers at Brewster's angle, andevaluate its performances. We show that this Polarizer is wide-band, has a high extinction ratio (> 6 × 103) and very small insertion losses (inf 1%). We provide measurements of the temporal waveforms after Linearly polarizing the THz beam and show that there is no distortion of the pulse. We compare its performances with a commercial wire-grid Polarizer, and show that the Brewster's angle Polarizer can conveniently be used to control the power of a terahertz beam. Cop. 2011 Optical Society of America.
Kyung Hyun Park - One of the best experts on this subject based on the ideXlab platform.
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metal vo2 hybrid grating structure for a terahertz active switchable Linear Polarizer
Nanotechnology, 2015Co-Authors: Junhwan Shin, Kiwon Moon, Eui Su Lee, Ilmin Lee, Kyung Hyun ParkAbstract:An active terahertz (THz) wave hybrid grating structure of Au/Ti metallic grating on VO2/Al2O3 (0001) was fabricated and evaluated. In our structure, it is shown that the metallic gratings on the VO2 layer strengthen the metallic characteristics to enhance the contrast of the metallic and dielectric phases of a VO2-based device. Especially, the metal grating-induced optical conductivity of the device is greatly enhanced, three times more than that of a metallic phase of bare VO2 films in the 0.1–2.0 THz spectral range. As an illustrative example, we fabricated an actively on/off switchable THz Linear Polarizer. The fabricated device has shown commercially comparable values in degree of polarization (DOP) and extinction ratio (ER). A high value of 0.89 in the modulation depth (MD) for the transmission field amplitude, superior to other THz wave modulators, is achieved. The experimental results show that the fabricated device can be highly useful in many applications, including active THz Linear Polarizers, THz wave modulators and variable THz attenuators.
Nori F. - One of the best experts on this subject based on the ideXlab platform.
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Spin-Hall effect of light at a tilted Polarizer
'The Optical Society', 2019Co-Authors: Bliokh K. Y., Prajapati C., Samlan C. T., Viswanathan N. K., Nori F.Abstract:We describe the spin-Hall effect of light (as well as the angular Goos-H\"{a}nchen effect) at a tilted Linear-dichroic plate, such as a usual Linear Polarizer. Although the spin-Hall effect at a tilted Polarizer was previous associated with the geometric spin-Hall effect of light (which was contrasted to the regular spin-Hall effect) [J. Korger et al., Phys. Rev. Lett. 112, 113902 (2014)], we show that the effect is actually an example of the regular spin-Hall effect that occurs at tilted anisotropic plates [K. Y. Bliokh et al., Optica 3, 1039 (2016)]. Moreover, our approach reveals the angular spin-Hall shift, which is absent in the "geometric" approach. We verify our theory experimentally using the method of quantum weak measurements.Comment: 4 pages, 3 figures, to appear in Opt. Let
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Spin-Hall effect of light at a tilted Polarizer
'The Optical Society', 2019Co-Authors: Bliokh Konstantin, Samlan C. T., Viswanathan N. K., Prajapati Chandravati, Nori F.Abstract:We describe the spin-Hall effect of light (as well as the angular Goos-Hänchen effect) at a tilted Linear-dichroic plate, such as a usual Linear Polarizer. Although the spin-Hall effect at a tilted Polarizer was previously associated with the geometric spin-Hall effect of light (which was contrasted to the regular spin-Hall effect) [Phys. Rev. Lett. 112, 113902 (2014)], we show that the effect is actually an example of the regular spin-Hall effect that occurs at tilted anisotropic plates [Optica 3, 1039 (2016)]. Moreover, our approach reveals the angular spin-Hall shift, which is absent in the “geometric” approach. We verify our theory experimentally using the method of quantum weak measurements.Air Force Office of Scientific Research (FA9550- 14-1-0040); Army Research Office (W911NF-18-1-0358); Core Research for Evolutional Science and Technology (JPMJCR1676); Japan Science and Technology Agency (QLEAP); Japan Society for the Promotion of Science (VS.059.18N); John Templeton Foundation; Science and Engineering Research Board (TAR/2018/000552); Australian Research Council; Science and Engineering Research Board (SERB), India; Asian Office of Aerospace Research and Development (AOARD) (FA2386-18-1-4045)
Bob Gravelle - One of the best experts on this subject based on the ideXlab platform.
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sensor modulation transfer function measurement using band limited laser speckle
Optics Express, 2008Co-Authors: Xi Chen, Nicholas George, Gennadiy Agranov, Bob GravelleAbstract:A new methodology for image sensor modulation transfer function measurement using band-limited laser speckle is presented. We use a circular opal milk glass diffuser illuminated by a 5mW He-Ne laser and a Linear Polarizer to generate band-limited speckle on the sensor. The power spectral density cut-off frequency of the speckle is chosen to be twice that of the sensor Nyquist frequency by placing the sensor at the specific Z location along the optical axis. For the speckle input, we calculate the power spectral density at the sensor using the Rayleigh-Sommerfeld integral and then measure the output power spectral density for the speckle pattern captured by the sensor. With these data, the two-dimensional image sensor modulation transfer function (MTF) is calculated.