Journal
ACS PHOTONICS
Volume 9, Issue 2, Pages 567-574Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.1c01511
Keywords
all-dielectric nanophotonics; optical resonances; mid-IR range; nonlinear optics
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Funding
- Australian Research Council [DP200101168, DP210101292]
- US Army International Office [FA520921P0034]
- Federal Ministry of Education and Research (BMBF) by the German Academic Exchange Service (DAAD) [57427209]
- German Research Foundation DFG [CRC 1375 NOA]
- Russian Science Foundation [18-72-10140]
- Priority 2030 grant
- Russian Science Foundation [21-72-03022] Funding Source: Russian Science Foundation
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This study introduces the concept of BICs to the field of high-harmonic generation and uses resonant dielectric metasurfaces to efficiently generate optical harmonics up to the 11th order, including the observation of a transition to the nonlinear regime. This research bridges the fields of perturbative and nonperturbative nonlinear optics at the subwavelength scale.
Optical bound states in the continuum (BICs) underpin the existence of strongly localized waves embedded into the radiation spectrum. Here we bring the concept of BICs to the field of high-harmonic generation and employ resonant dielectric metasurfaces to generate efficiently optical harmonics up to the 11th order. We design BIC-resonant metasurfaces with a broken in-plane symmetry for the lower harmonics and then observe a transition to the nonlinear regime for higher harmonics. Our approach bridges the fields of perturbative and nonperturbative nonlinear optics on the subwavelength scale.
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