High-harmonic generation at the nanoscale boosted by bound states in the continuum

Year: 2019

Authors: Carletti L., Kruk SS., Bogdanov AA., De Angelis C., Kivshar Y.

Autors Affiliation: Univ Padua, Dept Informat Engn, I-35131 Padua, Italy; Australian Natl Univ, Nonlinear Phys Ctr, Canberra, ACT 2601, Australia; ITMO Univ, St Petersburg 197101, Russia; Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; Natl Inst Opt INO CNR, I-25123 Brescia, Italy.

Abstract: Recent progress in nanoscale optics is driven by the physics of electric and magnetic resonances supported by high-index dielectric nanoparticles. Here, we exploit optical bound states in the continuum in a subwavelength particle enhanced by an engineered substrate undergoing an epsilon-near-zero transition from an insulator to a conductor, and uncover how to boost dramatically high-order parametric nonlinear effects. Our strategy makes feasible an observation of a variety of multistep cascaded and multifrequency nonlinear effects in an individual subwavelength resonator. This would expand substantially the range of applications of Mie-resonant dielectric metaphotonics for highly efficient subwavelength optical circuitry, nonlinear metadevices, ultrasensitive hyperspectral sensing, and quantum nanophotonics.

Journal/Review: PHYSICAL REVIEW RESEARCH

Volume: 1 (2)      Pages from: 023016-1  to: 023016-7

More Information: S.K., A.B., and Y.K. acknowledge useful collaboration and discussions with K. Koshelev. L.C. acknowledges STARStG project PULSAR. C.D.A. acknowledges financial support from Consiglio Nazionale delle Ricerche (CNR) joint laboratory projects 2019-2021. A.A.B. acknowledges RSF (Grant No. 18-72-10140) and Foundation for the Advancement of Theoretical Physics and Mathematics BASIS. This work was supported by the Strategic Fund of the Australian National University. A.B. acknowledges support by the RFBR (19-0200419), the Grant of the President of the Russian Federation (MK-403.2018.2), and “BASIS” foundation.
KeyWords: ENHANCED 2ND-HARMONIC GENERATION; DIELECTRIC NANOPARTICLES; META-OPTICS; RESONANCES; FIELD; PEROVSKITE; SILICON; SI
DOI: 10.1103/PhysRevResearch.1.023016

Citations: 104
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