Semicylindrical microresonator: excitation, modal structure, and Q factor

TL;DR

This paper investigates a semicylindrical microresonator formed on a dielectric/metal/dielectric structure, analyzing its excitation, modal structure, and high Q-factor potential through theoretical and numerical methods.

Contribution

It introduces a novel semicylindrical microresonator design that combines features of Fabry-Perot and Whispering gallery modes, with analysis of excitation and Q-factor.

Findings

Q-factor up to 10^4 achieved

Efficient excitation with plane wave demonstrated

Radiation losses depend on radius and material properties

Abstract

The semicylindrical microresonator with relatively simple excitation with a plane wave is studied. The resonator is formed on the base of the dielectric/metal/dielectric structure, where the wave energy penetrates into resonator through a thin metal layer and stored in a semicylindrical dielectric with high permittivity. The proposed microresonator combines features of Fabry-Perot and Whispering gallery mode resonators. Dependence of radiation losses on the radius and materials are estimated by theoretical analysis, while excitation by a plane wave is shown via numerical analysis. The quality Q-factor of the resonator can achieve up to 104, at a radius of a semicylinder of several microns.