Long-wavelength mid-infrared reflectors using guided-mode resonance

Abstract

We have proposed and fabricated a new mid-infrared reflector using the guided-mode resonance (GMR). The GMR reflector consists of subwavelength Ge grating on GaAs substrate with a low-refractive-index ${\mathrm{SiO}}_x$ layer in between. With a total thickness of about 2 μm, a near-100% reflectivity at 8 μm has been obtained both theoretically and experimentally.

© 2013 Optical Society of America

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