Giant Nonlinear Response at the Nanoscale Driven by Bound States in the Continuum

Carletti, Luca; Koshelev, Kirill; Angelis, C. De; Kivshar, Yuri S.

doi:10.1103/physrevlett.121.033903

Cited by 354 publications

(222 citation statements)

References 38 publications

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“…The study of nonlinear effects with isolated nanoparticles has been initiated only very recently, with the experimental demonstrations yet to come. Carletti et al [110] studied SHG from isolated subwavelength AlGaAs nanoparticles and predicted that nonlinear effects at the nanoscale can be boosted dramatically provided the resonator parameters are tuned to the BIC regime. They predicted a record-high conversion efficiency for nanoscale resonators that exceeds by two orders of magnitude the conversion efficiency observed at the magnetic dipole Mie resonance (see Fig.…”

Section: Nonlinear Harmonic Generationmentioning

confidence: 99%

Nonradiating photonics with resonant dielectric nanostructures

et al. 2019

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Nonradiating sources of energy have traditionally been studied in quantum mechanics and astrophysics, while receiving a 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 the light-matter interaction at the nanoscale. This review paper provides the 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: optical anapoles and photonic bound states in the continuum. We discuss a brief history of these states in optics, 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-resonances, nonlinear wave mixing and enhanced harmonic generation, as well as advanced concepts for lasing and optical neural networks. arXiv:1903.04756v1 [physics.optics]

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Section: Nonlinear Harmonic Generationmentioning

confidence: 99%

Nonradiating photonics with resonant dielectric nanostructures

et al. 2019

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“…Both superradiance and subradiance have been realized in various systems [10][11][12][13][14][15][16][17][18][19][20][21][22][23], and they provide novel opportunities to explore the interplay between collective excitations in materials and nonlinear effects in scattering of light [7,8]. Compared to superradiance, subradiance enables longer time for lightmatter interaction, and giant nonlinear response [24][25][26]. To the best of our knowledge, the enhancement of lightmatter interaction by subradiant modes has been explored mostly in classical optics.…”

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confidence: 99%

Inelastic Scattering of Photon Pairs in Qubit Arrays with Subradiant States

Poshakinskiy

Lee

et al. 2019

Phys. Rev. Lett.

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We develop a rigorous theoretical approach for analyzing inelastic scattering of photon pairs in arrays of two-level qubits embedded in a waveguide. Our analysis reveals strong enhancement of the scattering when the energy of incoming photons resonates with the double-excited subradiant states. We identify the role of different double-excited states in the scattering such as superradiant, subradiant, and twilight states, being a product of single-excitation bright and subradiant states. Importantly, the N -excitation subradiant states can be engineered only if the number of qubits exceeds 2N . Both the subradiant and twilight states can generate long-lived photon-photon correlations, paving the way to a storage and processing of quantum information.

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“…As it is shown, the SHG efficiency exhibits very dramatic growth in the vicinity of the supercavity mode, and it reaches its maximum exactly at the quasi-BIC condition. The predicted record-high value of the conversion efficiency for nanoscale resonators exceeds by two orders of magnitude the conversion efficiency observed at the magnetic dipole Mie resonance [60]. In addition, we also notice that high-Q factors at the nanoscale can boost not only the sum-frequency generation efficiency, but also other processes, in particular, the spontaneous parametric downconversion.…”

Section: Isolated Nanoparticlesmentioning

confidence: 58%

“…As a result, the processes of high-order harmonic generation can be boosted dramatically since they scale as (Q/V ) n , where n is the process order and V is the mode volume [59]. Therefore, the giant increase of the generation efficiency is expected in isolated subwavelength nanoantennas tuned to the BIC regime which was recently predicted for the case of the secondharmonic generation (SHG) in AlGaAs nanodisks [60]. Figure 2 outlines the results of our numerical analysis on the enhancement on the SHG efficiency for individual dielectric nanodisks in the supercavity regime.…”

Section: Isolated Nanoparticlesmentioning

confidence: 94%

Meta-optics and bound states in the continuum

2019

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We discuss the recent advances in meta-optics and nanophotonics associated with the physics of bound states in the continuum (BICs). Such resonant states appear due to a strong coupling between leaky modes in optical guiding structures being supported by subwavelength high-index dielectric Mie-resonant nanoantennas or alldielectric metasurfaces. First, we review briefly very recent developments in the BIC physics in application to isolated subwavelength particles. We pay a special attention to novel opportunities for nonlinear nanophotonics due to the large field enhancement inside the particle volume creating the resonant states with high-quality (high-Q) factors, the so-called quasi-BIC, that can be supported by the subwavelength particles. Second, we discuss novel applications of the BIC physics to all-dielectric optical metasurfaces with broken-symmetry metaatoms when tuning to the BIC conditions allows to enhance substantially the Q factor of the flat-optics dielectric structures. We also present the original results on nonlinear high-Q metasurfaces and predict that the frequency conversion efficiency can be boosted dramatically by smart engineering of the asymmetry parameter of dielectric metasurfaces in the vicinity of the quasi-BIC regime. arXiv:1810.08698v1 [physics.optics]

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Giant Nonlinear Response at the Nanoscale Driven by Bound States in the Continuum

Cited by 354 publications

References 38 publications

Nonradiating photonics with resonant dielectric nanostructures

Nonradiating photonics with resonant dielectric nanostructures

Inelastic Scattering of Photon Pairs in Qubit Arrays with Subradiant States

Meta-optics and bound states in the continuum

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