Air-mode photonic crystal ring resonator on silicon-on-insulator

作者：Ge Gao, Yong Zhang, He Zhang, Yi Wang, Qingzhong Huang, Jinsong Xia · 发表于：Scientific Reports · 年份：2016 · DOI：10.1038/srep19999 · 被引用次数：44 · 研究领域：Photonic and Optical Devices、Photonic Crystals and Applications、Optical Coatings and Gratings

In this report, we propose and demonstrate an air-mode photonic crystal ring resonator (PhCRR) on silicon-on-insulator platform. Air mode is utilized to confine the optical field into photonic crystal (PhC) air holes, which is confirmed by the three-dimensional finite-difference time-domain simulation. PhCRR structure is employed to enhance the light-matter interaction through combining the whispering-gallery mode resonance of ring resonator with the slow-light effect in PhC waveguide. In the simulated and measured transmission spectra of air-mode PhCRR, nonuniform free spectral ranges are observed near the Brillouin zone edge of PhC, indicating the presence of the slow-light effect. A maximum group index of 27.3 and a highest quality factor of 14600 are experimentally obtained near the band edge. Benefiting from the strong optical confinement in the PhC holes and enhanced light-matter interaction in the resonator, the demonstrated air-mode PhCRR is expected to have potential applications in refractive index sensing, on-chip light emitting and nonlinear optics by integration with functional materials.