Abstract
Metasurface thermal emitter, whose thermal radiation is tailored by surface micro-nano structures, has been used as a convenient, sensitive and spectrally-efficient radiative source in application of mid-infrared gas sensing. In this study, we numerically and experimentally demonstrate a metasurface thermal emitter based on Au-Al2O3-Au MIM structure which realizes the dual-band spatially-distinguishable emission spectrum. Two strong emission modes are excited in different ranges of emission angles, making it possible to distinguish them by means of their corresponding spatial locations without using optical filters. This emitter promotes a more compact sensing strategy and possibly paves a way to the miniaturization of infrared optical gas sensors.
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