Coherent Perfect Absorbers: Time-reversed Lasers - Physics > OpticsReport as inadecuate

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Abstract: We show that an arbitrary body or aggregate can be made perfectly absorbingat discrete frequencies if a precise amount of dissipation is added underspecific conditions of coherent monochromatic illumination. This effect arisesfrom the interaction of optical absorption and wave interference, andcorresponds to moving a zero of the elastic S-matrix onto the real wavevectoraxis. It is thus the time-reversed process of lasing at threshold. The effectis demonstrated in a simple Si slab geometry illuminated in the 500-900 nmrange. Coherent perfect absorbers are novel linear optical elements, absorptiveinterferometers, which may be useful for controlled optical energy transfer.

Author: Y. D. Chong, Li Ge, Hui Cao, A. D. Stone


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