Optical nanoresonators

Abstract

The review presents the analysis and generalization of classical and most modern approaches to the description and development of the principles of operation of open optical nanoresonators, that is, resonators, all sizes of which are smaller than the resonant wavelength of radiation in vacuum. Particular attention is paid to the physics of such phenomena as bound states in a continuum, anapole states, supercavity modes, and perfect nonradiating modes with extremely high-quality factors and localizations of electromagnetic fields. The analysis of the optical properties of natural oscillations in nanoresonators made of metamaterials is also presented in the review. The effects considered in this review are not purely fundamental, but can also find applications in the development of optical nanoantennas, nanolasers, biosensors, photovoltaic devices, and nonlinear nanophotonics.

Quality Factor of Dielectric Spherical Resonators

“…12 These results have recently been extended to show that the quadrupolar and octupolar electric modes grow as n 7 and n 9 for the same n → ∞ limit. 13 However, none of these articles deal with optical losses. Establishing a general relation for the Q factor of a dielectric sphere with any complex RI would be an important guide towards the design of dielectric resonators with optimized performance.…”