Tuning Leaky Nanocavity Resonances - Perturbation Treatment

TL;DR

This paper presents a first-order perturbation analysis of dielectric constant modulation effects on nanocavity resonances, providing semi-analytical expressions for frequency and Q-factor changes, validated by numerical results.

Contribution

It introduces a perturbative approach to predict how dielectric constant modulation influences nanocavity resonance frequency and quality factor.

Findings

Derived semi-analytical expressions for DCM-induced frequency shifts.

Validated analytical results with numerical calculations.

Demonstrated controllability of Q-factor through dielectric modulation.

Abstract

Adiabatic frequency tuning of finite-lifetime-nanocavity electromagnetic modes affects also their quality-factor (Q). Perturbative Q change resulting from (real) frequency tuning, is a controllable parameter. Here, the influence of dielectric constant modulation (DCM) on cavity resonances is presented, by first order perturbation analysis for a 3D cavity with radiation losses. Semi-analytical expressions for DCM induced cavity mode frequency and Q changes are derived. The obtained results are in good agreement with numerical calculations.