title: Angle-independent plasmonic infrared band-stop reflective filter based on the Ag/SiO₂/Ag T-shaped array.
abstract: A plasmonic infrared (IR) filter assisted by localized surface plasmon polaritons (LSPPs) in a Ag/SiO₂/Ag T-shaped array was theoretically and experimentally investigated. By using a Fourier transform infrared (FTIR) spectrometer, an angle-independent LSPP resonant mode caused by a Fabry-Pérot resonance in the structure was observed in agreement with the prediction from the rigorous coupled-wave analysis (RCWA) simulation. The resonant wavelength of the mode can also be controlled by modifying the geometry of the T-shaped structure. Such LSPP property can be used as an IR reflection-type band-stop filter with a single spectral bandwidth and an ultrahigh immunity to incident angles.
authors.affiliation: Research Center for Applied Sciences (RCAS), Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Cheng-Wen
authors.initials: CW
authors.lastname: Cheng
authors.forename: Mohammed Nadhim
authors.initials: MN
authors.lastname: Abbas
authors.forename: Zi-Chang
authors.initials: ZC
authors.lastname: Chang
authors.forename: M H
authors.initials: MH
authors.lastname: Shih
authors.forename: Chih-Ming
authors.initials: CM
authors.lastname: Wang
authors.forename: M C
authors.initials: MC
authors.lastname: Wu
authors.forename: Yia-Chung
authors.initials: YC
authors.lastname: Chang