Abstract

We present a new class of coherent perfect absorbers based on guided-mode resonance in thin semiconductor films. Using particle-swarm optimization methods, we design a thin-film amorphous silicon grating that maximizes coherent modulation of the absorbance. The optimized device exhibits a maximum scattering power of 94% and a power absorption limit approaching 100% at the 1550-nm wavelength.

© 2014 Optical Society of America

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