ArticleNanophotonics (Berlin, Germany)2022
Nonlinear response of Q-boosting metasurfaces beyond the time-bandwidth limit.
Article in Nanophotonics (Berlin, Germany), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Ultrafast Q-boosting in semiconductor metasurfaces.Nanophotonics (Berlin, Germany) · 2024Article
- Enhancing second harmonic generation by Q-boosting lossless cavities beyond the time bandwidth limit.Nanophotonics (Berlin, Germany) · 2024Article
- Advances in nonlinear metasurfaces for imaging, quantum, and sensing applications.Nanophotonics (Berlin, Germany) · 2023Review
- Tunable nanophotonics.Nanophotonics (Berlin, Germany) · 2022Article
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Authors and funding
4 authors.
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Abstract
Resonant nanostructures, such as photonic metasurfaces, have created an unprecedented case for enhanced light-matter interactions through local field engineering. However, the presence of resonances fundamentally limits the bandwidth of such interactions. Here, we report on amending the nonlinear optical response of a semiconducting metasurface through Q-boosting, where the Q-factor of a metasurface rapidly increases with time. The coupled-mode theory reveals overcoming the bandwidth limit by coupling a broadband signal to a bandwidth-matched resonance and Q-boosting at a timescale faster than a resonator lifetime. A control-excitation experiment simulation using a tailored Q-boosting silicon-germanium metasurface predicts the third-harmonic enhancement by factors of 8 (peak) and 4.5 (integrated) against the best-case static metasurface. An analysis of free-carrier losses based on experimental data shows robustness to nonradiative losses and offers a viable pathway to increasing the light-matter interactions beyond the bandwidth limit, with implications in nonlinear and quantum optics, sensing, and telecommunication technologies.
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