title: Asymmetric photonic resonances in GaN slab waveguide for mid infrared selective filters.
abstract: We demonstrate a spectrally selective reflector that exploits asymmetric photonic resonances of a 1D photonic crystal. The proposed spectrally selective reflector has a very simple structure - essentially just a single high-index slab of GaN, properly perforated, and supported by a transparent sapphire substrate. With the proper 1D array design, nearly 100% reflection is achieved with a narrow spectral width between 10 cm⁻¹ - 18 cm⁻¹, while the background reflection remains low across the entire mid-IR range. The reflection peak can be tuned over a large wavelength span based on physical parameters. Resonant transmission dips in the experimentally measured spectra corroborate the device theory and simulation, exhibiting the narrowband low-background mid-IR reflection as predicted.
authors.forename: S R
authors.initials: SR
authors.lastname: Vangala
authors.forename: I
authors.initials: I
authors.lastname: Avrutsky
authors.forename: P
authors.initials: P
authors.lastname: Keiffer
authors.forename: N
authors.initials: N
authors.lastname: Nader
authors.forename: D
authors.initials: D
authors.lastname: Walker
authors.forename: J W
authors.initials: JW
authors.lastname: Cleary
authors.forename: J R
authors.initials: JR
authors.lastname: Hendrickson