Dynamic process of free space excitation of asymmetry resonant microcavity

TL;DR

This paper numerically investigates the physics and dynamics of free space beam excitation in asymmetry resonant microcavities, revealing interference effects, excitation efficiencies, and dynamical tunneling phenomena.

Contribution

It provides a detailed numerical analysis of the excitation process in asymmetry resonant microcavities, including transmission spectra, efficiency dependence, and phase space dynamics.

Findings

Irregular Fano-type transmission spectra observed.

Excitation efficiency correlates with emission reversal.

Evidence of dynamical tunneling in excitation process.

Abstract

The underlying physics and detailed dynamical processes of the free space beam excitation to the asymmetry resonant microcavity are studied numerically. Taking the well-studied quadrupole deformed microcavity as an example, we use a Gaussian beam to excite the high-Q mode. The simulation provides a powerful platform to study the underlying physics. The transmission spectrum and intracavity energy can be obtained directly. Irregular transmission spectrum was observed, showing asymmetric Fano-type lineshapes which could be attributed to interference between the different light paths. Then excitation efficiencies about the aim distance of the incident Gaussian beam and the rotation angle of the cavity were studied, showing great consistence with the reversal of emission efficiencies. By projecting the position dependent excitation efficiency to the phase space, the correspondence between the excitation and emission was demonstrated. In addition, we compared the Husimi distributions of the excitation processes and provided more direct evidences of the dynamical tunneling process in the excitation process.