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提出了基于光学Tamm态耦合的多通道表面等离激元吸收器。通过在金属-电介质-金属波导中引入光子晶体-金属异质结构设计了单向吸收器。对处于带隙范围内正向入射的电磁波,当满足阻抗匹配时产生光学Tamm态,吸收率高达0.988。表面等离激元波导内光子晶体/金属异质结构的非对称性导致单向阻抗匹配和吸收。当波导中引入多个光子晶体/金属异质结构时,由于多重光学Tamm态耦合产生多个劈裂的吸收峰。吸收峰的频率可以通过改变光学Tamm态之间的耦合强度来调节。所提出的多通道单向表面等离激元吸收器将在光学集成电路及太阳能电池等领域具有潜在的应用。
A multi-channel surface plasmon absorber based on optical Tamm-state coupling is proposed. One-way absorbers were designed by introducing photonic crystal-metal heterostructures into metal-dielectric-metal waveguides. For electromagnetic waves that are positively incident in the bandgap range, an optical Tamm state results when the impedance matching is satisfied, with absorption up to 0.988. Asymmetric photonic crystal / metal heterostructures in surface plasmon waveguides result in unidirectional impedance matching and absorption. When multiple photonic crystal / metal heterostructures are introduced into a waveguide, multiple cleaved absorption peaks result from the multiple optical Tamm-state coupling. The frequency of the absorption peak can be adjusted by changing the coupling strength between optical Tamm states. The proposed multi-channel unidirectional surface plasmon absorber will have potential applications in the fields of optical integrated circuits and solar cells.