Free-space-coupled wavelength-scale disk resonators
Abstract
Optical microresonators with low quality factor () can be efficiently excited by and scatter freely propagating optical waves, but those with high 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 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 and 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 footprints and mode volumes and the simplicity of their excitation and fabrication make wavelength-scale, free-space-coupled microdisks attractive for sensing, enhancing emission and nonlinearity, and as micro-laser cavities.
Keywords
Cite
@article{arxiv.2204.05816,
title = {Free-space-coupled wavelength-scale disk resonators},
author = {Babak Mirzapourbeinekalaye and Sarath Samudrala and Mahdad Mansouree and Andrew McClung and Amir Arbabi},
journal= {arXiv preprint arXiv:2204.05816},
year = {2022}
}