Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.103901
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Funding
- Strategic Fund of the Australian National University
- US Air Force Office of Scientific Research [FA2386-16-1-0002]
- Australian Research Council [DE190100430]
- Institute for Basic Science [IBS-R024-Y1]
- Russian Foundation for Basic Research [18-02-00381]
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We study nonlinear effects in two-dimensional photonic metasurfaces supporting topologically protected helical edge states at the nanoscale. We observe strong third-harmonic generation mediated by optical nonlinearities boosted by multipolar Mie resonances of silicon nanoparticles. Variation of the pump-beam wavelength enables independent high-contrast imaging of either bulk modes or spinmomentum-locked edge states. We demonstrate topology-driven tunable localization of the generated harmonic fields and map the pseudospin-dependent unidirectional waveguiding of the edge states bypassing sharp corners. Our observations establish dielectric metasurfaces as a promising platform for the robust generation and transport of photons in topological photonic nanostructures.
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