Abstract
Intense light-matter interaction is critical for enabling high-sensitivity refractive index sensors, high-efficiency light sources, and high-performance nonlinear devices. A bowtie-hole photonic crystal micro-ring resonator is proposed and numerically demonstrated to enhance the light-matter interaction effectively through achieving strong spatial and temporal light confinement, simultaneously. Through engineering the photonic crystal unit cell, the bowtie-hole photonic crystal is proved to possess the ability to localize light with a highly tight spatial confinement. By optimizing the bowtie-hole radius and the bowtie angle, the Q factor of the air mode in the resonator is improved to 1.42 × 105, which denotes an excellent temporal confinement. With the advantages addressed, the refractive index sensing based on the high-Q air mode in the bowtie-hole photonic crystal micro-ring resonator is investigated. For the air mode in the bowtie-hole photonic crystal micro-ring resonator, the Q factor is comparable with that in the reported research, meanwhile the sensing sensitivity has a 2-fold enhancement.
Highlights
Micro-ring resonators (MRRs) are excellent transducers for sensing due to their simple structure, compact footprint and easy integration
Since the optical field of the resonant air mode is concentrated in the bowtie-holes, the dimensions of the bowtie-hole can affect the optical field distributions and the Q factor of the resonant air mode in the Bowtie-PhC-MRR
It should be noted that only the resonant air mode possessing the highest Q factor is discussed here
Summary
Micro-ring resonators (MRRs) are excellent transducers for sensing due to their simple structure, compact footprint and easy integration. Some schemes have been proposed from the view of enhancing the light-matter interaction, including operating in transverse magnetic (TM) mode [10] or constructing a MRR with ultra-thin (
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