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 SiOx 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.