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Subwavelength dielectric resonators for nonlinear nanophotonics
Kirill Koshelev1,2, Sergey Kruk1, Elizaveta Melik-Gaykazyan1,3
1Nonlinear Physics Center, Australian National University, Canberra ACT 2601, Australia.
Science (New York, N.Y.)
|January 18, 2020
Summary
Researchers engineered special modes in nanoscale dielectric resonators to suppress light loss. This boosts nonlinear effects, enhancing light-matter interactions for applications in optics and photonics.
Area of Science:
- Photonics and Nanotechnology
- Nonlinear Optics
Background:
- Subwavelength optical resonators utilize high-index dielectric materials for nanoscale light manipulation.
- Mie-resonant dielectric structures exhibit low absorption, with radiative losses limiting functionality.
- Current methods struggle to overcome radiative losses in nanoscale resonators.
Purpose of the Study:
- To implement a novel physical mechanism for suppressing radiative losses in individual nanoscale resonators.
- To engineer special modes with high quality factors, specifically optical bound states in the continuum (BICs).
- To demonstrate enhanced nonlinear effects, such as second-harmonic generation, using BIC modes.
Main Methods:
- Fabrication of subwavelength dielectric resonators.
- Engineering of optical bound states in the continuum (BICs) within these resonators.
- Characterization of nonlinear optical responses, focusing on second-harmonic generation.
Main Results:
- Demonstrated suppression of radiative losses in individual nanoscale resonators.
- Successfully engineered BIC modes with high quality factors.
- Observed a significant boost in nonlinear effects, specifically second-harmonic generation efficiency.
Conclusions:
- Individual subwavelength dielectric resonators hosting BIC modes can enhance nonlinear effects.
- This approach offers a new route for strong light-matter interactions at the nanoscale.
- Potential applications include nonlinear optics, nanoscale lasers, quantum photonics, and sensors.
