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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
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High-harmonic generation from a subwavelength dielectric resonator
Anastasiia Zalogina1,2, Luca Carletti3, Anton Rudenko4
1Nonlinear Physics Centre, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia.
Science Advances
|May 1, 2023
Summary
Scientists generated up to a seventh harmonic of light using a tiny, subwavelength AlGaAs resonator. This breakthrough miniaturizes high-harmonic generation sources to subwavelength volumes for advanced optical applications.
Area of Science:
- Nonlinear optics
- Nanophotonics
- Solid-state physics
Background:
- Higher-order optical harmonics are observed in nanostructured solids like gratings and metasurfaces.
- Subwavelength structuring enhances nonlinear processes and reduces source size.
Purpose of the Study:
- To demonstrate high-harmonic generation in a single subwavelength resonator.
- To miniaturize solid-state sources of high harmonics.
Main Methods:
- Fabrication of a subwavelength AlGaAs resonator (~0.1 λ³).
- Excitation of resonant modes using an azimuthally polarized, tightly focused beam at 3.7 μm.
- Analysis of perturbative and nonperturbative nonlinearities.
Main Results:
- Observed generation of up to the seventh harmonic.
- Resonator design supports a quasi-bound state in the continuum mode.
- Efficient harmonic generation achieved in a compact volume.
Conclusions:
- Subwavelength resonators can efficiently generate higher-order optical harmonics.
- Miniaturized solid-state high-harmonic sources are feasible.
- Quasi-bound states in the continuum are key for enhanced nonlinearities.
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