A Multi-Channel Tunable Tamm Plasma Perfect Absorber

Abstract

The invention discloses a multi-channel tunable Tamm plasma perfect absorber, comprising: MIM waveguide and metal-DBR-metal intercalation-DBR-metal structure in the waveguide, wherein metal-DBR-metal intercalation-DBR-metal The thickness of the metal on both sides of the structure is different, with the metal intercalation as the center, the period numbers of the DBRs on both sides are N1 and N2 respectively. The invention is a novel multi-channel tunable Tamm plasmon perfect absorber, TM polarized light is incident from the left side, through the MIM structure, the Gap-SPPs can be efficiently excited in the waveguide, and the metal-DBR in the waveguide ‑Metal intercalation‑DBR‑metal structure can excite multiple optical Tamm states, and couple with each other to form multiple split absorption peaks, realizing multi-channel narrow-band perfect absorption. The surface plasmon absorber of the invention has a compact structure, is easy to process and has high-quality preparation, and has good application prospects in the fields of dangerous substance detection, hyperspectral multi-frequency imaging, coherent thermal radiation and stealth technology.

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) are a kind of electromagnetic wave mode localized on the metal surface, which is based on the interaction between the incident electromagnetic radiation and the conduction electrons on the metal surface or metal nano-scale particles, which excite and couple the fluctuation of the charge density. Electromagnetic oscillation 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 cir...

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, Yang C 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 tuned, and the demand for more channels cannot be realized.

Images