Open AccessAsymmetric photonic resonances in GaN slab waveguide for mid infrared selective filters
Author(s) -
Shiva Vangala,
Ivan Avrutsky,
Patrick Keiffer,
Nader D. Nader,
Dennis E. Walker,
Justin W. Cleary,
Joshua R. Hendrickson
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.024742
Subject(s) - optics , photonic crystal , materials science , reflection (computer programming) , reflector (photography) , optoelectronics , narrowband , photonics , refractive index , coupled mode theory , slab , wavelength , guided mode resonance , sapphire , laser , diffraction grating , physics , light source , geophysics , computer science , programming language
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.