High- Q Dielectric Mie-Resonant Nanostructures (Brief Review)
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High-Q Dielectric Mie-resonant Nanostructures (Mini-review) P. Tonkaev+1) , Y. Kivshar+∗ 1) + ITMO ∗ Nonlinear
University, 197101 St. Petersburg, Russia
Physics Centre, Australian National University, Canberra ACT 2601, Australia Submitted 14 October 2020 Resubmitted 19 October 2020 Accepted 19 October 2020
Future technologies underpinning high-performance optical communications, ultrafast computations and compact biosensing will rely on densely packed reconfigurable optical circuitry based on nanophotonics. For many years, plasmonics was considered as the only available platform for nanoscale optics, but the recently emerged novel field of Mie resonant metaphotonics provides more practical alternatives for nanoscale optics by employing resonances in high-index dielectric nanoparticles and structures. In this mini-review we highlight some recent trends in the physics of dielectric Mie-resonant nanostructures with high quality factor (Q factor) for efficient spatial and temporal control of light by employing multipolar resonances and the bound states in the continuum. We discuss a few applications of these concepts to nonlinear optics, nanolasers, subwavelength waveguiding, and sensing. DOI: 10.1134/S0021364020220038
Introduction. Nanophotonics is considered often as a special branch of optics that studies the behaviour of light on the nanometer scales including interaction of subwavelength objects with light. For many applications and for creating compact optical circuits and networks, it is highly desirable to miniaturize photonic components, and traditionally nanophotonics was based on metallic components which transport and focus light via surface plasmon polaritons which allow to overcome the diffraction limit [1]. However, plasmonic components are known to suffer from strong dissipative losses and heating. Recently, we have observed the emergence of a new field of all-dielectric resonant metaphotonics [2] (also called “Mie-tronics” [3]) aiming at the manipulation of strong optically-induced electric and magnetic Mie-type resonances in dielectric nanostructures with high refractive index. Unique advantages of such dielectric resonant nanostructures over their metallic counterparts are low dissipative losses combined with the strong enhancement of both electric and magnetic fields, thus providing competitive alternatives for plasmonics including optical nanoantennas, biosensors, and metasurfaces. High-index dielectric nanoantennas supporting multipolar Mie resonances represents a novel type of building blocks of metamaterials for generating, manipulat-
ing, and modulating light. By combing both electric and magnetic multipolar modes, one can not only modify far-field radiation patterns but also localized the electromagnetic energy in open resonators by employing the physics of bound states in the continuum (BICs) to achieve destructive interference of two (or more) leaky modes [4, 5]. Optical Mie resonances in nanoantennas can be characterized the average lifetime of trapped light being quantified by the value of the
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