Air and dielectric bands photonic crystal microringresonator for refractive index sensing

作者：Darius Urbonas, Armandas Balčytis, Konstantinas Vaškevičius, Martynas Gabalis, Raimondas Petruškevičius · 发表于：Optics Letters · 年份：2016 · DOI：10.1364/ol.41.003655 · 被引用次数：46 · 研究领域：Photonic and Optical Devices、Photonic Crystals and Applications、Optical Coatings and Gratings

We present the experimental and numerical analysis of a microring resonator with an integrated one-dimensional photonic crystal fabricated on a silicon-on-insulator platform and show its applicability in bulk refractive index sensing. The photonic crystal is formed by periodically patterned, partially etched cylindrical perforations, whose induced photonic bandgap is narrower than the range of measurable wavelengths (1520-1620 nm). Of particular interest is that the microring operates in both air and dielectric bands, and the sensitivities of the resonances on both edges of the bandgap were investigated. We showed that a higher field localization inside the volume of the perforations for the air band mode leads to an increase in sensitivity.