Analysis, design and simulation of MIM plasmonic filters with different geometries for technical parameters improvement  

作　　者：Sara Gholinezhad Shafagh Hassan Kaatuzian Mohammad Danaie 

机构地区：[1]Photonics Research Laboratory(PRL),Electrical Engineering Department,Amirkabir University of Technology,Tehran,Iran [2]Electrical and Computer Engineering Faculty,Semnan University,Semnan,Iran

出　　处：《Communications in Theoretical Physics》2020年第8期134-147,共14页理论物理通讯（英文版）

摘　　要：In this paper, four optical filter topologies based on metal–insulator–metal waveguides are proposed and the designed structures are investigated numerically using finite-difference timedomain method. Triangular-shaped adjunctions have been added to the filter structures to improve their transmission spectrum. These improved structures consist of air as the insulator and silver as the metal. The relative permittivity of metal has been described via the Drude,Drude–Lorentz, and Palik models. The first filter’s transmission spectrum shows an acceptable transmittance. In the second optimized filter, the transmission spectrum has been improved. The transmittance spectrum can be tuned through adjusting the edge of the triangle in these four optimized filters. As a result, the bandwidths of resonance spectra can be adjusted. The theory of such tapered structures will be investigated by the tapered transmission line and will be solved with the transfer matrix method. This method shows a better performance and higher transmission efficiency in comparison with the basic structures. On the other hand, the final filter has been chosen as the best one because of its hexagonal resonator. The main reason for having a better result is due to a longer interaction length in comparison with the circular resonator. This in turn creates much better energy coupling and results in higher transmission.

关 键 词：PLASMONICS surface plasmon polariton(SPP) optical filter metal–insulator–metal(MIM)waveguide Drude model 

分 类 号：O53[理学—等离子体物理] TN713[理学—物理]