The Experts below are selected from a list of 78969 Experts worldwide ranked by ideXlab platform
Jibing Liu - One of the best experts on this subject based on the ideXlab platform.
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Nonreciprocal Light Propagation in coupled microcavities system beyond weak-excitation approximation
Scientific reports, 2017Co-Authors: Anshou Zheng, Guangyong Zhang, T. Mei, Hongyun Chen, Jibing LiuAbstract:We propose a scheme for nonreciprocal Light Propagation in two coupled cavities system, in which a two-level quantum emitter is coupled to one of the optical microcavities. For the case of parity-time ([Formula: see text]) symmetric system (i.e., coupled active-passive cavities system), the cavity gain can significantly enhance the optical nonlinearity induced by the interaction between a quantum emitter and cavity field beyond weak-excitation approximation. The increased optical nonlinearity results in the non-lossy nonreciprocal Light Propagation with high isolation ratio in proper parameters range. In addition, our calculations show that nonreciprocal Light Propagation will not be affected by the unstable output field intensity caused by optical bistability, and we can even switch directions of nonreciprocal Light Propagation by appropriately adjusting the system parameters.
Anshou Zheng - One of the best experts on this subject based on the ideXlab platform.
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Nonreciprocal Light Propagation in coupled microcavities system beyond weak-excitation approximation
Scientific reports, 2017Co-Authors: Anshou Zheng, Guangyong Zhang, T. Mei, Hongyun Chen, Jibing LiuAbstract:We propose a scheme for nonreciprocal Light Propagation in two coupled cavities system, in which a two-level quantum emitter is coupled to one of the optical microcavities. For the case of parity-time ([Formula: see text]) symmetric system (i.e., coupled active-passive cavities system), the cavity gain can significantly enhance the optical nonlinearity induced by the interaction between a quantum emitter and cavity field beyond weak-excitation approximation. The increased optical nonlinearity results in the non-lossy nonreciprocal Light Propagation with high isolation ratio in proper parameters range. In addition, our calculations show that nonreciprocal Light Propagation will not be affected by the unstable output field intensity caused by optical bistability, and we can even switch directions of nonreciprocal Light Propagation by appropriately adjusting the system parameters.
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Nonreciprocity Light Propagation in coupled microcavities system beyond weak-excitation approximation
arXiv: Quantum Physics, 2016Co-Authors: Anshou Zheng, Guangyong Zhang, Hanwu Chen, T. Mei, Junye LiuAbstract:We propose an alternative scheme for nonreciprocal Light Propagation in two coupled cavities system, in which a two-level quantum emitter is coupled to one of the optical microcavities. For the case of parity-time (\textrm{PT}) system (i.e., active-passive coupled cavities system), the cavity gain can significantly enhance the optical nonlinearity induced by the interaction between a quantum emitter and cavity field beyond weak-excitation approximation. The giant optical nonlinearity results in the non-lossy nonreciprocal Light Propagation with high isolation ratio in proper parameters range. In addition, our calculations show that nonreciprocal Light Propagation will not be affected by the unstable output field intensity caused by optical bistability and we can even switch directions of nonreciprocal Light Propagation by appropriately adjusting the system parameters.
Robert W. Boyd - One of the best experts on this subject based on the ideXlab platform.
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Ultraslow and ultrafast Light Propagation in room-temperature solids
Frontiers in Optics 2004 Laser Science XXII Diffractive Optics and Micro-Optics Optical Fabrication and Testing, 2004Co-Authors: Robert W. Boyd, Matthew S. Bigelow, Nick N. Lepeshkin, Aaron Schweinsberg, Petros ZeromAbstract:We have observed ultraslow and ultrafast Light Propagation in several room-temperature solids as a consequence of the phenomenon of coherent population oscillations. Various new applications are enabled by the ability to exercise such control over the velocity of Light.
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Superluminal and Slow Light Propagation in a Room-Temperature Solid
Science (New York N.Y.), 2003Co-Authors: Matthew S. Bigelow, Nick N. Lepeshkin, Robert W. BoydAbstract:We have observed both superluminal and ultraslow Light Propagation in an alexandrite crystal at room temperature. Group velocities as slow as 91 meters per second to as fast as -800 meters per second were measured and attributed to the influence of coherent population oscillations involving chromium ions in either mirror or inversion sites within the crystal lattice. Namely, ions in mirror sites are inversely saturable and cause superluminal Light Propagation, whereas ions in inversion sites experience conventional saturable absorption and produce slow Light. This technique for producing large group indices is considerably easier than the existing methods to implement and is therefore suitable for diverse applications.
Alwin Kienle - One of the best experts on this subject based on the ideXlab platform.
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Light Propagation in dry and wet softwood
Optics express, 2008Co-Authors: Alwin Kienle, Cosimo D'andrea, Florian Foschum, Paola Taroni, Antonio PifferiAbstract:Light Propagation in dry and wet softwood (silver fir) was investigated experimentally and theoretically. The spatially and time resolved reflectance from softwood was measured. Light Propagation was modeled with Monte Carlo simulations considering the microstructure of softwood. By comparing the spatially resolved reflectance we found that all characteristics of the experimentally obtained iso-intensity contour lines were recovered by the theory. In addition, the reduced scattering and the absorption coefficients were determined in the time domain by fitting a solution of the diffusion equation to Monte Carlo simulations and to measurements. Good qualitative agreement was obtained between the experimentally and theoretically derived optical properties.
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Light Propagation in Biological Tissue: A Multiscale Approach
Biomedical Optics, 2008Co-Authors: Alwin Kienle, Jan Schäfer, René MichelsAbstract:Light Propagation in biological tissue is investigated in three scales. Maxwell equations are applied to consider the tissue's microstructure. Based on these results transport theory and diffusion theory are used to handle large tissue volumes.
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Modeling of Light Propagation in dentin
Photon Migration and Diffuse-Light Imaging, 2003Co-Authors: Florian K. Forster, Alwin Kienle, Raimund HibstAbstract:The knowledge of the scattering phase function, which describes the angular intensity distribution of the scattered Light, is important for modeling the Light Propagation in turbid media. This is especially true for structured media, where Light Propagation is anisotropic, leading to direction-dependent reflected or transmitted intensity profiles. We investigated scattering by combining analytical solutions and finite difference time domain (FDTD) simulations of the Maxwell equations with two-axes goniometric experiments. Using polystyrene spheres and cylindrical phantoms the methods were successfully validated. The phase functions of dentin slabs were measured and it is shown that the scattering of dentin tubuli resembles cylinder scattering.
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Light Propagation in dentin: influence of microstructure on anisotropy.
Physics in medicine and biology, 2002Co-Authors: Alwin Kienle, Florian K. Forster, Rolf Diebolder, Raimund HibstAbstract:We investigated the dependence of Light Propagation in human dentin on its microstructure. The main scatterers in dentin are the tubules, the shape of which can be approximated as long cylinders. We calculated the scattering of electromagnetic waves by an infinitely long cylinder and applied the results in a Monte Carlo code that simulates the Light Propagation in a dentin slab considering multi-scattering. The theory was compared with goniometric measurements. A pronounced anisotropic scattering pattern was found experimentally and theoretically. In addition, intensity peaks were measured which are shown to be caused by Light diffraction by the tubules.
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Multiscale Description of Light Propagation in Biological Tissue
Springer Proceedings in Physics, 1Co-Authors: Alwin Kienle, René Michels, Jan Schäfer, Oliver FuggerAbstract:A multiscale description of the Light Propagation in biological tissue is presented. The Maxwell’s equations, the transport equation, and the diffusion equation are applied for the description on the microscopic, mesoscopic, and macroscopic scale, respectively. The modus operandi of the multiscale approach is illustrated for the case of tendon tissue. It is shown that the aligned microstructure of tendon strongly influences the Light Propagation in the tissue.
Li You - One of the best experts on this subject based on the ideXlab platform.
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Slow Light Propagation in trapped atomic quantum gases
Physical Review A, 2001Co-Authors: Özgür E. Müstecaplıoğlu, Li YouAbstract:We study semiclassical slow Light Propagation in trapped two-level atomic quantum gases. The temperature-dependent behaviors of both group velocity and transmissions are compared for low-temperature Bose, Fermi, and Boltzman gases within the local-density approximation for their spatial density profile.
