Antisymmetric Mode Cancellation for High-Q Cavities in a Double-Disk.

Hong, Seung Hyeon; Lee, Young Jin; Hong, Seokhyeon; Kim, Youngsoo; Kwon, Soon-Hong

High-quality factor dielectric microcavities like whispering-gallery-mode resonators can be widely applied in fields such as laser, optical sensor, switch, and filter. We propose the whispering-gallery-mode double-disk cavity comprising dielectric disks apart along the face of the disk. The electric field of each disk with opposite phases was excited; the emitted radiation field was annihilated by destructive interference. We numerically achieved a 5.67-fold enhancement in quality factor at the double-disk cavity with a radius, thickness, and gap distance of 850 nm, 220 nm, and 220 nm, respectively, compared to a single dielectric disk with the same structural conditions.

QUALITY factor; WHISPERING gallery modes; OPTICAL sensors; ELECTRIC fields

Photonics, 2022, Vol 9, Issue 8, p572

2304-6732

Academic Journal

10.3390/photonics9080572