The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Sylvain Gigan - One of the best experts on this subject based on the ideXlab platform.
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Single-photon entanglement generation by wavefront shaping in a multiple-Scattering Medium
Optics letters, 2014Co-Authors: Hugo Defienne, Marco Barbieri, Benoit Chalopin, Béatrice Chatel, Ian A. Walmsley, Brian J. Smith, Sylvain GiganAbstract:We demonstrate the control of entanglement of a single photon between several spatial modes propagating through a strongly Scattering Medium. Measurement of the Scattering matrix allows the wavefront of the photon to be shaped to compensate the distortions induced by multiple Scattering events. The photon can thus be directed coherently to a single or multi-mode output. Using this approach we show how entanglement across different modes can be manipulated despite the enormous wavefront disturbance caused by the Scattering Medium.
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Spatio-temporal focusing of an ultrafast pulse through a multiply Scattering Medium.
Nature communications, 2011Co-Authors: David J. Mccabe, Ian A. Walmsley, Sylvain Gigan, Ayhan Tajalli, Dane R. Austin, Pierre Bondareff, Béatrice ChatelAbstract:Pulses of light propagating through multiply Scattering media undergo complex spatial and temporal distortions to form the familiar speckle pattern. There is much current interest in both the fundamental properties of speckles and the challenge of spatially and temporally refocusing behind Scattering media. Here we report on the spatially and temporally resolved measurement of a speckle field produced by the propagation of an ultrafast optical pulse through a thick strongly Scattering Medium. By shaping the temporal profile of the pulse using a spectral phase filter, we demonstrate the spatially localized temporal recompression of the output speckle to the Fourier-limit duration, offering an optical analogue to time-reversal experiments in the acoustic regime. This approach shows that a multiply Scattering Medium can be put to profit for light manipulation at the femtosecond scale, and has a diverse range of potential applications that includes quantum control, biological imaging and photonics.
He-ping Tan - One of the best experts on this subject based on the ideXlab platform.
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Transient/time-dependent radiative transfer in a two-dimensional Scattering Medium considering the polarization effect.
Optics express, 2017Co-Authors: Cun-hai Wang, Yong Zhang, Yan-yan Feng, He-ping TanAbstract:Transient/time-dependent radiative transfer in a two-dimensional Scattering Medium is numerically solved by the discontinuous finite element method (DFEM). The time-dependent term of the transient vector radiative transfer equation is discretized by the second-order central difference scheme and the space domain is discretized into non-overlapping quadrilateral elements by using the discontinuous finite element approach. The accuracy of the transient DFEM model for the radiative transfer equation considering the polarization effect is verified by comparing the time-resolved Stokes vector component distributions against the steady solutions for a polarized radiative transfer problem in a two-dimensional rectangular enclosure filled with a Scattering Medium. The transient polarized radiative transfer problems in a Scattering Medium exposed to an external beam and in an irregular emitting Medium are solved. The distributions of the time-resolved Stokes vector components are presented and discussed.
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Polarized radiative transfer in two-dimensional Scattering Medium with complex geometries by natural element method
Journal of Quantitative Spectroscopy and Radiative Transfer, 2016Co-Authors: Yong Zhang, Ming Xie, Yong-jun Kim, He-ping TanAbstract:Abstract The natural element method (NEM) is extended to solve the polarized radiative transfer problem in a two-dimensional Scattering Medium with complex geometries, in which the angular space is discretized by the discrete-ordinates approach, and the spatial discretization is conducted by the Galerkin weighted residuals approach. The Laplace interpolation scheme is adopted to obtain the shape functions used in the Galerkin weighted residuals approach. The NEM solution to the vector radiative transfer in a square enclosure filled with a Mie Scattering Medium is first examined to validate our program. We then study the polarized radiative transfer in two kinds of geometries filled with Scattering Medium which is equivalent to a suspension of latex spheres in water. Three sizes of spheres are considered. The results for non-dimensional polarized radiative flux along the boundaries and the angular distributions of the Stokes vector at specific positions are presented and discussed. For the complex geometry bounded by the square and circular object, numerical solutions are presented for the cases both with Lambertian (diffuse) reflection and with Fresnel reflection. Some interesting phenomenon are found and analyzed.
Kevin J. Webb - One of the best experts on this subject based on the ideXlab platform.
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fourier magnitude of the field incident on a random Scattering Medium from spatial speckle intensity correlations
Optics Letters, 2012Co-Authors: Jason A Newman, Kevin J. WebbAbstract:Spatial speckle intensity correlations are used to determine the spatial Fourier magnitude of a field incident on a random Scattering Medium. The patterned beam is scanned across the Scattering Medium, and the speckle pattern on the opposite side is imaged at each beam position. A theory based on a Green's function representation is used to reconstruct the spatial Fourier magnitude of the patterned incident field.
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Interferometry from a Scattering Medium.
Optics letters, 2007Co-Authors: Z. Wang, Andrew M. Weiner, Kevin J. WebbAbstract:A two-beam random interferometer is demonstrated where coupling is facilitated by a Scattering Medium. A modulation observed in the normalized second-order intensity frequency correlation of the transmitted light is attributed to the relative temporal delay of the two beams and is insensitive to beam alignment and spacing.
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Quantitative Raman spectroscopic study of acetonitrile in a Scattering Medium
1996Co-Authors: Jeffery S. Reynolds, Charles A. Thompson, Fred Laplant, Kevin J. Webb, Dor Ben-amotzAbstract:In this paper we demonstrate the use of Raman spectroscopy to determine the concentration of acetonitrile (CH3CN) dispersed in a water/Intralipid Scattering Medium. We compare techniques for extracting quantitative information from Raman spectra taken in highly Scattering media. This technique has potential for use in noninvasive, in vivo biomedical sensing.
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Detection of heterogeneities within a Scattering Medium using Raman spectroscopy
Proceedings of SPIE, 1995Co-Authors: Charles A. Thompson, Fred Laplant, Jeffery S. Reynolds, Dor Ben-amotz, Kevin J. WebbAbstract:A micro-Raman apparatus was used to detect an object embedded within a Scattering Medium. The Raman vibrational frequency of diamond in an intralipid Scattering Medium was detected at different radial distances from the diamond. Scanned images of a single diamond, two diamonds, and a diamond through an aperture are presented. This experiment shows that Raman spectroscopy can be a useful tool in locating and characterizing heterogeneities contained within a Scattering Medium.
Béatrice Chatel - One of the best experts on this subject based on the ideXlab platform.
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Single-photon entanglement generation by wavefront shaping in a multiple-Scattering Medium
Optics letters, 2014Co-Authors: Hugo Defienne, Marco Barbieri, Benoit Chalopin, Béatrice Chatel, Ian A. Walmsley, Brian J. Smith, Sylvain GiganAbstract:We demonstrate the control of entanglement of a single photon between several spatial modes propagating through a strongly Scattering Medium. Measurement of the Scattering matrix allows the wavefront of the photon to be shaped to compensate the distortions induced by multiple Scattering events. The photon can thus be directed coherently to a single or multi-mode output. Using this approach we show how entanglement across different modes can be manipulated despite the enormous wavefront disturbance caused by the Scattering Medium.
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Spatio-temporal focusing of an ultrafast pulse through a multiply Scattering Medium.
Nature communications, 2011Co-Authors: David J. Mccabe, Ian A. Walmsley, Sylvain Gigan, Ayhan Tajalli, Dane R. Austin, Pierre Bondareff, Béatrice ChatelAbstract:Pulses of light propagating through multiply Scattering media undergo complex spatial and temporal distortions to form the familiar speckle pattern. There is much current interest in both the fundamental properties of speckles and the challenge of spatially and temporally refocusing behind Scattering media. Here we report on the spatially and temporally resolved measurement of a speckle field produced by the propagation of an ultrafast optical pulse through a thick strongly Scattering Medium. By shaping the temporal profile of the pulse using a spectral phase filter, we demonstrate the spatially localized temporal recompression of the output speckle to the Fourier-limit duration, offering an optical analogue to time-reversal experiments in the acoustic regime. This approach shows that a multiply Scattering Medium can be put to profit for light manipulation at the femtosecond scale, and has a diverse range of potential applications that includes quantum control, biological imaging and photonics.
Yong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Transient/time-dependent radiative transfer in a two-dimensional Scattering Medium considering the polarization effect.
Optics express, 2017Co-Authors: Cun-hai Wang, Yong Zhang, Yan-yan Feng, He-ping TanAbstract:Transient/time-dependent radiative transfer in a two-dimensional Scattering Medium is numerically solved by the discontinuous finite element method (DFEM). The time-dependent term of the transient vector radiative transfer equation is discretized by the second-order central difference scheme and the space domain is discretized into non-overlapping quadrilateral elements by using the discontinuous finite element approach. The accuracy of the transient DFEM model for the radiative transfer equation considering the polarization effect is verified by comparing the time-resolved Stokes vector component distributions against the steady solutions for a polarized radiative transfer problem in a two-dimensional rectangular enclosure filled with a Scattering Medium. The transient polarized radiative transfer problems in a Scattering Medium exposed to an external beam and in an irregular emitting Medium are solved. The distributions of the time-resolved Stokes vector components are presented and discussed.
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Analysis of polarized pulse propagation through one-dimensional Scattering Medium
Journal of Quantitative Spectroscopy and Radiative Transfer, 2017Co-Authors: Yong Zhang, Feng-ju Yao, Ming XieAbstract:Abstract This paper analyzes the polarized light propagation in a one-dimensional Scattering Medium with the upper surface subjected to an oblique incident short-pulsed laser beam using the natural element method (NEM). The NEM discretization scheme for the transient vector radiative transfer equation (TVRTE) is presented in detail. The accuracy of the natural element method for transient vector radiative transfer in the Scattering Medium is assessed. Numerical results show that the NEM is accurate, and effective in solving transient polarized radiative problems. We examine a square short-pulsed laser transport firstly in the atmosphere with Mie Scattering and then within aerosol Scattering Medium. We then investigate the transient polarized radiative transfer problem in the atmosphere-ocean system. The time-resolved signals and the polarization state of the Stokes vector are presented and analyzed. It is found that the Scattering types of the Medium make greatly influence on the transient transportation of the polarized light. Critically, the polarization states of the backward and forward scattered photons show significantly different time varying trends. For the two-layer system with dissimilar refractive index distributions, due to the total-reflection effect, the existence of a Fresnel interface significantly changes the polarization state of the light, and discontinuous distribution features are observed on the interface.
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Polarized radiative transfer in two-dimensional Scattering Medium with complex geometries by natural element method
Journal of Quantitative Spectroscopy and Radiative Transfer, 2016Co-Authors: Yong Zhang, Ming Xie, Yong-jun Kim, He-ping TanAbstract:Abstract The natural element method (NEM) is extended to solve the polarized radiative transfer problem in a two-dimensional Scattering Medium with complex geometries, in which the angular space is discretized by the discrete-ordinates approach, and the spatial discretization is conducted by the Galerkin weighted residuals approach. The Laplace interpolation scheme is adopted to obtain the shape functions used in the Galerkin weighted residuals approach. The NEM solution to the vector radiative transfer in a square enclosure filled with a Mie Scattering Medium is first examined to validate our program. We then study the polarized radiative transfer in two kinds of geometries filled with Scattering Medium which is equivalent to a suspension of latex spheres in water. Three sizes of spheres are considered. The results for non-dimensional polarized radiative flux along the boundaries and the angular distributions of the Stokes vector at specific positions are presented and discussed. For the complex geometry bounded by the square and circular object, numerical solutions are presented for the cases both with Lambertian (diffuse) reflection and with Fresnel reflection. Some interesting phenomenon are found and analyzed.
