Multi-channel tunable Tamm plasma perfect absorber

Abstract

The invention discloses a multi-channel tunable Tamm plasma perfect absorber, which comprises an MIM waveguide and a metal-DBR-metal intercalation-DBR-metal structure in the waveguide, wherein metals at two sides of the metal-DBR-metal intercalation-DBR-metal structure are different in thickness; and with the metal intercalation as the center, the cycle numbers of the DBRs at two sides are N1 and N2 respectively. The multi-channel tunable Tamm plasma perfect absorber is a novel multi-channel tunable Tamm plasma perfect absorber; a TM polarized light normally enters from the left side, passes through the MIM structure and can efficiently stimulate Gap-SPPs within the waveguide; the metal-DBR-metal intercalation-DBR-metal structure in the waveguide can stimulate multiple optical Tamm states; and the multiple optical Tamm states are coupled to one another to form multiple split absorption peaks, so that multi-channel narrow-band perfect absorption is achieved. The surface plasma resonance absorber disclosed by the invention is compact in structure and easy to process and prepare with high quality, and has a relatively good application prospect in the fields of dangerous substance detection, hyperspectral multi-frequency imaging, coherent thermal radiation, a stealth technology and the like.

Description

technical field [0001] The invention relates to the field of nanophotonics, in particular to a multi-channel tunable Tamm plasma perfect absorber. Background technique [0002] Surface plasmon polaritons (Surface Plasmon Polaritons, SPPs) is an electromagnetic wave mode localized on the metal surface, which is based on the interaction of incident electromagnetic radiation with conduction electrons or metal nanoscale particles on the metal surface, exciting and coupling electromagnetic oscillations of charge density fluctuations , has the characteristics of near-field enhancement, surface confinement, and short wavelength. Because it can confine and modulate electromagnetic waves on a sub-wavelength scale, it has gradually become the most potential information carrier in the hot field of nanophotonics. Various nanophotonic devices based on SPPs are considered to be the most promising basis for the realization of nanoscale all-optical integrated circuits. [0003] When SPPs a...

AI Technical Summary

Problems solved by technology

However, it can only achieve single-channel absorption, and cannot be used in areas requiring narrow-band multi-channel absorption, such as hazardous substance detection and hyperspectral multi-frequency imaging.

In 2014, YangC et al. proposed a three-channel narrow-band absorber for the first time based on a subwavelength grating structure, which opened up a path for multi-channel perfect absorption, but the absorption rate is not perfect, and the number of channels cannot be adjusted, and the demand for more channels cannot be realized.

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