Trace formula for dieletric cavities : I. General properties

TL;DR

This paper develops a trace formula for open dielectric cavities, linking resonances to classical periodic orbits and boundary reflections, with derived asymptotic terms and validation against numerical results.

Contribution

It introduces a trace formula for dielectric cavities incorporating boundary reflection effects, extending classical methods to open systems with new asymptotic insights.

Findings

Derived asymptotic resonance counting functions related to cavity area and perimeter.

Established the connection between cavity resonances and classical periodic orbits.

Validated formulas with numerical calculations for circular dielectric cavities.

Abstract

The construction of the trace formula for open dielectric cavities is examined in detail. Using the Krein formula it is shown that the sum over cavity resonances can be written as a sum over classical periodic orbits for the motion inside the cavity. The contribution of each periodic orbit is the product of the two factors. The first is the same as in the standard trace formula and the second is connected with the product of reflection coefficients for all points of reflection with the cavity boundary. Two asymptotic terms of the smooth resonance counting function related with the area and the perimeter of the cavity are derived. The coefficient of the perimeter term differs from the one for closed cavities due to unusual high-energy asymptotics of the $\mathbf{S}$-matrix for the scattering on the cavity. Corrections to the leading semi-classical formula are briefly discussed. Obtained formulas agree well with numerical calculations for circular dielectric cavities.