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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Third-Harmonic Generation in Photonic Topological Metasurfaces
Daria Smirnova1,2, Sergey Kruk1, Daniel Leykam3
1Nonlinear Physics Centre, Australian National University, Canberra ACT 2601, Australia.
Physical Review Letters
|October 2, 2019
Summary
We demonstrate robust photon generation and transport in topological photonic nanostructures using silicon nanoparticles. These dielectric metasurfaces enable tunable localization and unidirectional waveguiding of edge states, bypassing sharp corners.
Area of Science:
- Nanophotonics
- Topological Photonics
- Nonlinear Optics
Background:
- Two-dimensional photonic metasurfaces support topologically protected edge states.
- Optical nonlinearities in nanostructures are crucial for light generation.
- Mie resonances enhance light-matter interactions in nanoparticles.
Purpose of the Study:
- Investigate nonlinear effects in topological photonic metasurfaces.
- Explore third-harmonic generation mediated by multipolar Mie resonances.
- Demonstrate tunable localization and waveguiding of edge states.
Main Methods:
- Fabrication and characterization of silicon nanoparticle-based metasurfaces.
- Utilizing nonlinear optical microscopy and spectroscopy.
- Varying pump-beam wavelength for selective imaging of bulk and edge states.
Main Results:
- Observed strong third-harmonic generation boosted by multipolar Mie resonances.
- Achieved high-contrast imaging of bulk modes and spin-momentum-locked edge states.
- Demonstrated topology-driven tunable localization and pseudospin-dependent unidirectional waveguiding of edge states.
Conclusions:
- Dielectric metasurfaces are a promising platform for topological photonics.
- Robust generation and transport of photons in topological nanostructures are achievable.
- Metasurfaces enable novel functionalities for light manipulation at the nanoscale.
