Radial bound states in the continuum for polarization-invariant nanophotonics

All-dielectric nanophotonics underpinned by the physics of bound states in the continuum (BICs) have demonstrated breakthrough applications in nanoscale light manipulation, frequency conversion and optical sensing. Leading BIC implementations range from isolated nanoantennas with localized electroma...

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Bibliographic Details
Published in:Nature communications 2022-08, Vol.13 (1), p.4992-4992, Article 4992
Main Authors: Kühner, Lucca, Sortino, Luca, Berté, Rodrigo, Wang, Juan, Ren, Haoran, Maier, Stefan A., Kivshar, Yuri, Tittl, Andreas
Format: Article
Language:English
Subjects:
142/126
639/624/400/1021
639/925/357/1015
Asymmetry
Electromagnetic fields
Fabrication
Humanities and Social Sciences
Invariants
multidisciplinary
Optics
Polarization
Resonance
Science
Science (multidisciplinary)
Second harmonic generation
Transition metal compounds
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Summary:All-dielectric nanophotonics underpinned by the physics of bound states in the continuum (BICs) have demonstrated breakthrough applications in nanoscale light manipulation, frequency conversion and optical sensing. Leading BIC implementations range from isolated nanoantennas with localized electromagnetic fields to symmetry-protected metasurfaces with controllable resonance quality (Q) factors. However, they either require structured light illumination with complex beam-shaping optics or large, fabrication-intense arrays of polarization-sensitive unit cells, hindering tailored nanophotonic applications and on-chip integration. Here, we introduce radial quasi-bound states in the continuum (radial BICs) as a new class of radially distributed electromagnetic modes controlled by structural asymmetry in a ring of dielectric rod pair resonators. The radial BIC platform provides polarization-invariant and tunable high-Q resonances with strongly enhanced near fields in an ultracompact footprint as low as 2 µm 2 . We demonstrate radial BIC realizations in the visible for sensitive biomolecular detection and enhanced second-harmonic generation from monolayers of transition metal dichalcogenides, opening new perspectives for compact, spectrally selective, and polarization-invariant metadevices for multi-functional light-matter coupling, multiplexed sensing, and high-density on-chip photonics. In their work on radial BICs, the authors realize a nanophotonic platform with high resonance Q factors and drastically reduced spatial footprint ideally suited for enhanced on-chip biomolecular sensing and nonlinear light generation.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-32697-z