Journal
ACS PHOTONICS
Volume 6, Issue 11, Pages 2671-2676Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b00024
Keywords
thermal emission; Fano resonance; parity-symmetric; metasurfaces; optical absorbers
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Funding
- National Natural Science Foundation of China [11321063, 61425018, 11374151]
- [2012CB933501]
- [2012CB921500]
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In this study, we designed a metasurface based on Al/SiN/Al nanosandwich optical absorbers. Parity-symmetric dark magnetic resonance modes, antisymmetric bright magnetic resonance modes, and surface lattice modes are established simultaneously in such a meta-surface. By changing the structural parameters, the wavelength of the dark mode can be tuned to overlap with the lattice mode. Fano resonance is introduced by coupling between the dark and the lattice modes. Angular-resolved thermal emission experiments showed that the thermal emission induced by the Fano resonance exhibited a narrow wavelength spectrum and directional radiation angle. Fano-type thermal emitters proposed in this work can possibly be used as coherent infrared light sources in the future.
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