Narrowband filter in a heterostructured multilayer containing ultrathin metallic films

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Abstract

A narrowband reflection and/or transmission filter made of heterostructured multilayer with two different ultrathin metallic films is proposed. The multilayer structure is a cascaded system that is formed by using two narrowband reflection-and-transmission filters. Each individual filter is made of an ultrathin metal film in front of a planar Fabry-Perot resonator. Using the transfer matrix method in a stratified system, the optical filtering properties are theoretically investigated and analyzed. It is found that the reflection peak at the design wavelength in the original individual filter becomes a dip in the heterostructured filter. The role played by the stack number of Bragg reflector in the design of narrowband filter is also clearly elucidated.

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Liu, C. C., Chang, Y. H., Yang, T. J., & Wu, C. J. (2009). Narrowband filter in a heterostructured multilayer containing ultrathin metallic films. Progress in Electromagnetics Research, 96, 329–346. https://doi.org/10.2528/PIER09090704

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