Coherent Perfect Absorbers: Time-reversed Lasers

Details Coherent Perfect Absorbers: Time-reversed Lasers Coherent Perfect Absorbers: Time-reversed Lasers

2010-03-25

arxiv.org/abs/1003.4968v1

Phys. Rev. Lett. 105, 053901 (2010)

Physics

Optics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.105.053901

We show that an arbitrary body or aggregate can be made perfectly absorbing at discrete frequencies if a precise amount of dissipation is added under specific conditions of coherent monochromatic illumination. This effect arises from the interaction of optical absorption and wave interference, and corresponds to moving a zero of the elastic S-matrix onto the real wavevector axis. It is thus the time-reversed process of lasing at threshold. The effect is demonstrated in a simple Si slab geometry illuminated in the 500-900 nm range. Coherent perfect absorbers are novel linear optical elements, absorptive interferometers, which may be useful for controlled optical energy transfer.

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