Free-space-coupled wavelength-scale disk resonators.

ABSTRACT: Optical microresonators with low quality factor ( Q ) can be efficiently excited by and scatter freely propagating optical waves, but those with high Q typically cannot. Here, we present a universal model for resonators interacting with freely propagating waves and show that the stored energy of a resonator excited by a plane wave is proportional to the product of its Q and directivity. Guided by this result, we devise a microdisk with periodic protrusions in its circumference that couples efficiently to normally incident plane waves. We experimentally demonstrate several microdisk designs, including one with a radius of 0.75 λ0 and Q of 15,000. Our observation of thermally-induced bistability in this resonator at input powers as low as 0.7 mW confirms strong excitation. Their small footpr

SUBMITTER: Mirzapourbeinekalaye B 

PROVIDER: S-EPMC11501722 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature