Abstract
AbstractNonradiating sources of energy have traditionally been studied in quantum mechanics and astrophysics but have received very little attention in the photonics community. This situation has changed recently due to a number of pioneering theoretical studies and remarkable experimental demonstrations of the exotic states of light in dielectric resonant photonic structures and metasurfaces, with the possibility to localize efficiently the electromagnetic fields of high intensities within small volumes of matter. These recent advances underpin novel concepts in nanophotonics and provide a promising pathway to overcome the problem of losses usually associated with metals and plasmonic materials for the efficient control of light-matter interaction at the nanoscale. This review paper provides a general background and several snapshots of the recent results in this young yet prominent research field, focusing on two types of nonradiating states of light that both have been recently at the center of many studies in all-dielectric resonant meta-optics and metasurfaces: opticalanapolesand photonicbound states in the continuum. We discuss a brief history of these states in optics, as well as their underlying physics and manifestations, and also emphasize their differences and similarities. We also review some applications of such novel photonic states in both linear and nonlinear optics for the nanoscale field enhancement, a design of novel dielectric structures with high-Qresonances, nonlinear wave mixing, and enhanced harmonic generation, as well as advanced concepts for lasing and optical neural networks.
Highlights
Nonradiating sources are defined as particular electromagnetic states that do not emit energy in the farfield region
Theoretical and experimental studies revealed that the complex interaction of multimode and multipolar resonances in Mie-resonant dielectric structures can support a different class of nonradiating electromagnetic states characterized by no energy leakage and spatially localized profiles. These states are characterized by the resonant frequencies lying in the continuum spectrum of radiating modes of the structure, and they are known as bound states in the continuum (BIC) from the earlier days of quantum mechanics [24]
1 0 System parameters we summarize the central points of the work by Hsu and others [48], which reviewed the properties of different classes of BICs in details
Summary
Nonradiating sources are defined as particular electromagnetic states that do not emit energy in the farfield region. Theoretical and experimental studies revealed that the complex interaction of multimode and multipolar resonances in Mie-resonant dielectric structures can support a different class of nonradiating electromagnetic states characterized by no energy leakage and spatially localized profiles. These states are characterized by the resonant frequencies lying in the continuum spectrum of radiating modes of the structure, and they are known as bound states in the continuum (BIC) from the earlier days of quantum mechanics [24]. The aim of this review is to highlight some of the recent results in this new, recently emerged research area, providing an up-to-date overview of the recent applications and possible future perspectives
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