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

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.

Automated summary

The article introduces a whispering-gallery-mode double-disk cavity that enhances the quality factor through destructive interference. Under specific structural conditions, the quality factor of the double-disk cavity is 5.67 times higher than that of a single dielectric disk.