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Published on: July 29, 2013
Broadband Coherent Enhancement of Transmission and Absorption in Disordered Media
Chia Wei Hsu1, Arthur Goetschy2, Yaron Bromberg1
1Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
Abstract:
Spatial modulation of the incident wave front has become a powerful method for controlling the diffusive transport of light in disordered media; however, such interference-based control is intrinsically sensitive to frequency detuning. Here, we show analytically and numerically that certain wave fronts can exhibit strongly enhanced total transmission or absorption across bandwidths that are orders of magnitude broader than the spectral correlation width of the speckles. Such broadband enhancement is possible due to long-range correlations in coherent diffusion, which cause the spectral degrees of freedom to scale as the square root of the bandwidth rather than the bandwidth itself.
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