Infrared Frequency-Tunable Coherent Thermal Sources

Abstract

In this work, we numerically demonstrate an infrared frequency-tunable selective thermal emitter made of graphene covered SiC deep gratings. Full-wave simulation shows temporally-coherent emission peak associated with magnetic polariton, whose resonance frequency can be dynamically tuned within the phonon absorption band of SiC by varying graphene chemical potential. An analytical inductor-capacitor circuit model is introduced to quantitatively predict the resonance frequency and further elucidate the mechanism for the tunable emission peak. Moreover, by depositing multiple layers of graphene sheets onto the SiC deep gratings, a large tunability of 8.5% in peak frequency can be obtained to yield the coherent emission covering a broad frequency range from 820 1/cm to 890 1/cm. The novel tunable met-amaterial could pave the way to a new class of tunable thermal sources in the infrared region.

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Cited by in corpus (4)

• Spectrally enhancing near-field radiative transfer between gold gratings by exciting magnetic polariton in nanometric vacuum gaps
• Spectrally enhancing near-field radiative heat transfer by exciting magnetic polariton in SiC gratings
• Active control of thermal emission by graphene-nanowire coupled plasmonic metasurfaces
• Design rules for active control of narrowband thermal emission using phase-change materials