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In this study, we designed a metasurface based on Al/SiN/Al nano-sandwichoptical absorbers. Parity-symmetric dark magnetic resonance modes,anti-symmetric bright magnetic resonance modes, and surface lattice modes areestablished simultaneously in such a meta-surface. By changing the structuralparameters, the wavelength of the dark mode can be tuned to overlap with thelattice mode. Fano resonance is introduced by coupling between the dark andlattice modes. Angular-resolved thermal emission experiments showed that thethermal emission induced by Fano resonance exhibited a narrow wavelengthspectrum and directional radiation angle. Fano-type thermal emitters proposedin this work can possibly be used as coherent infrared light sources in thefuture.

Controlling Thermal Emission by Parity-symmetric Fano Resonance of Optical Absorbers in Metasurfaces