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Boosting third-harmonic generation by a mirror-enhanced anapole resonator.
Lei Xu1, Mohsen Rahmani2, Khosro Zangeneh Kamali2
11School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600 Australia.
Light, Science & Applications
|March 7, 2019
Summary
A novel dielectric anapole resonator on a metallic mirror significantly enhances third harmonic generation by two orders of magnitude. This breakthrough boosts nonlinear emission efficiency to 0.01% through resonant mode overlap and mirror-induced effects.
Area of Science:
- Photonics and Nanophotonics
- Nonlinear Optics
- Plasmonics
Background:
- Anapole resonators typically enhance nonlinear optical processes.
- Previous designs on insulating substrates showed limited efficiency.
- Off-resonant interference of electric and toroidal modes hindered performance.
Purpose of the Study:
- To demonstrate a dielectric anapole resonator on a metallic mirror for enhanced third harmonic generation.
- To investigate the role of resonant mode overlap in enhancing nonlinear emission.
- To explore the contribution of mirror-induced effects to nonlinear signal amplification.
Main Methods:
- Fabrication of a silicon nanodisk on a gold mirror.
- Excitation of the anapole mode with resonant Cartesian electric and toroidal dipole modes.
- Characterization of third harmonic emission enhancement.
- Analysis of near-field enhancement and mirror-induced effects.
Main Results:
- Achieved a two-orders-of-magnitude enhancement in third harmonic emission compared to traditional anapole resonators.
- Observed significant near-field enhancement due to resonant mode overlap.
- Demonstrated boosted nonlinear emission from free-charge oscillations at the mirror interface.
- Experimentally obtained an unprecedented nonlinear conversion efficiency of 0.01%.
Conclusions:
- Dielectric anapole resonators on metallic mirrors offer superior performance for nonlinear harmonic generation.
- Resonant excitation and mirror-induced effects are crucial for maximizing nonlinear emission.
- This approach represents a significant advancement in achieving high-efficiency nonlinear light sources.
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