Abstract
The mid-infrared transmission through a 3.7 µm period, two-dimensional sub-wavelength Au metallic hole array integrated on a GaSb/InAs strained layer superlattice nBn photodetector is measured. The surface plasmon-polariton excitation on the Au film induces a peak transmission in the 200 K detector response at 4.2 µm. This transmission is enhanced threefold by the insertion of a SiNx layer between the Au film and the substrate for impedance matching analogous to antireflection coating.
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