Summary
International Symposium on Antennas and Propagation
2012
Session Number:POS1
Session:
Number:POS1-40
Transmission Characteristics of a Thin Metal Film Sandwiched between Dielectric Gratings
Yuu Wakabayashi, Takato Fukui, Junji Yamauchi, Hisamatsu Nakano,
pp.-
Publication Date:2012/10/29
Online ISSN:2188-5079
Summary:
We analyze a polarizer consisting of a thin metal film sandwiched between dielectric gratings using the FDTD method with the periodic boundary condition. High transmissivities of this polarizer are based on the Fabry-Pérot resonance (FPR), surface plasmon resonance (SPR), and guided-mode resonance (GMR). It is revealed that the SPR and GMR depend on the periodicity, whereas the FPR depends on the thickness of the gratings. Therefore, the wavelengths corresponding to the GMR and SPR shift toward longer wavelengths as the periodicity is increased, while the high transmissivity based on the FPR is maintained at λ = 1.15 μm. This fact enables us to design the polarizer which operates at a required wavelength.