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27 April 2016 Light transmission channels in random scattering media (Conference Presentation)
Hui Cao
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Proceedings Volume 9717, Adaptive Optics and Wavefront Control for Biological Systems II; 97170L (2016) https://doi.org/10.1117/12.2208090
Event: SPIE BiOS, 2016, San Francisco, California, United States
Abstract
Recently it has been shown that shaping the wavefront of an incident laser beam can significantly enhance the total transmission of light through strong scattering media [1]. This is done by coupling light to high transmission channels. However, optical absorption would modify such transmission channels. In a disordered system with uniform absorption, the maximal transmission channel changes from diffusive to ballistic-like transport [2]. This ballistic-like transport may enable new modes of imaging in absorbing media. If the absorption is distributed non-uniformly in space, the high transmission channels redirect the energy flows to circumvent the absorbing regions to minimize loss. Thus the attenuation of high transmission channels by inhomogeneous absorption becomes lower than that by homogeneous absorption [3]. Since the maximum transmission channel is the most efficient in bypassing the absorbing region, the ratio of its transmittance to the average transmittance increases with absorption, eventually exceeds the ratio without absorption. The finding that inhomogeneous absorption may have a weaker impact on open channels than homogeneous absorption is promising for practical applications. [1] S. M. Popoff, A. Goetschy, S. F. Liew, A. D. Stone, and H. Cao. Phys. Rev. Lett. 112, 133903 (2014). [2] S. F. Liew, S. M. Popoff, A. P. Mosk, W. L. Vos, and H. Cao. Phys. Rev. B 89, 224202 (2014). [3] S. F. Liew and H. Cao. Opt. Express 23, 11043 (2015).
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Hui Cao "Light transmission channels in random scattering media (Conference Presentation)", Proc. SPIE 9717, Adaptive Optics and Wavefront Control for Biological Systems II, 97170L (27 April 2016); https://doi.org/10.1117/12.2208090
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KEYWORDS
Absorption
Scattering media
Transmittance
Wavefronts
Channel projecting optics
Control systems
Light scattering
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