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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
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Meta-optics and bound states in the continuum.
Kirill Koshelev1, Andrey Bogdanov2, Yuri Kivshar1
1Nonlinear Physics Centre, Australian National University, Canberra ACT 2601, Australia; ITMO University, St. Petersburg 197101, Russia.
Science Bulletin
|January 20, 2023
Summary
Recent advances in meta-optics leverage bound states in the continuum (BICs) for enhanced light-matter interactions. This research explores quasi-BICs in dielectric nanoparticles and metasurfaces for novel nonlinear nanophotonics applications.
Area of Science:
- Meta-optics
- Nanophotonics
- Condensed Matter Physics
Background:
- Bound states in the continuum (BICs) are resonant states arising from strong coupling in optical guiding structures.
- Subwavelength high-index dielectric nanoantennas and all-dielectric metasurfaces support these resonant states.
- BICs offer unique opportunities for enhancing light-matter interactions at the nanoscale.
Purpose of the Study:
- To review recent developments in BIC physics applied to isolated subwavelength particles.
- To explore novel applications of BIC physics in all-dielectric optical metasurfaces.
- To investigate nonlinear nanophotonics opportunities enabled by high-quality factor (high-Q) resonant states.
Main Methods:
- Review of recent advancements in BIC physics.
- Analysis of field enhancement in dielectric nanoparticles supporting quasi-BICs.
- Investigation of broken-symmetry meta-atoms in all-dielectric metasurfaces tuned to BIC conditions.
- Experimental and theoretical study of nonlinear high-Q metasurfaces.
Main Results:
- Isolated subwavelength particles can support quasi-BICs with high-Q factors, enabling nonlinear nanophotonics.
- All-dielectric metasurfaces with broken-symmetry meta-atoms exhibit substantially enhanced Q factors near BIC conditions.
- Original results demonstrate nonlinear high-Q metasurfaces with potential for boosted frequency conversion efficiency.
Conclusions:
- Engineering asymmetry in dielectric metasurfaces near the quasi-BIC regime can dramatically enhance frequency conversion efficiency.
- The physics of BICs provides a powerful platform for developing advanced meta-optics and nanophotonics devices.
- High-Q resonant states in dielectric nanostructures open new avenues for nonlinear optical applications.
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