研究目的
To present a general study of the Q-factor of the family of electric and magnetic PRs as well as whispering gallery mode (WGM) dielectric resonators, employing unified electrodynamic theory in order to show how the Q-factor is limited by medium and radiation losses. In addition, the impact of the finite size of the resonator on the resonance frequency and Q-factor is considered.
研究成果
The study shows that basic properties of spherical PRs and WGM resonators can be rigorously determined employing unified electrodynamic analysis. The Q-factor is limited by different kinds of losses depending on the resonator type and size. For PRs, radiation losses vary with frequency and size, while for WGM resonators, dielectric losses are dominant if the mode order is large enough.
研究不足
The quasi-static theory does not allow to determine the Q-factor of a plasmonic resonator and fails for larger samples. The Q-factor is limited by medium and radiation losses, and for very small samples, surface roughness also limits the Q-factor.
