Transformation cavities with a narrow refractive index profile
Abstract
Recently, gradient index cavities, or so-called transformation cavities, designed by conformal transformation optics have been studied to support resonant modes with both high Q-factors and emission directionality. We propose a new design method for transformation cavities to realize a narrower width of the refractive index profile, a great advantage in experimental implementations, without losing the benefits of conformal mapping. We study the resonant modes with both high Q-factor and directional emission in the newly designed transformation cavities, where the refractive index profile is 50 percent narrower than in previously proposed transformation cavities. By varying a system parameter with a fixed maximal value of the refractive index profile inside the cavity, the width of the refractive index profile narrows, the Q-factors become higher, and the near and far field patterns maintain their properties, namely conformal whispering gallery modes and bidirectional emission, respectively.
Cite
@article{arxiv.2102.09516,
title = {Transformation cavities with a narrow refractive index profile},
author = {Jung-Wan Ryu and Jinhang Cho},
journal= {arXiv preprint arXiv:2102.09516},
year = {2021}
}
Comments
13 pages, 4 figures