Nonlinear Metasurfaces Governed by Bound States in the Continuum

By K. Koshelev, Yutao Tang, K. Li, D. Choi, Guixin Li, Yuri Kivshar. ACS Photonics, 2019

474 citations recorded by the source corpus.

Nonlinear nanostructured surfaces provide a paradigm shift in nonlinear optics with new ways to control and manipulate frequency conversion processes at the nanoscale, also offering novel opportunities for applications in photonics, chemistry, material science, and biosensing. Here, we develop a general approach to employ sharp resonances in metasurfaces originated from the physics of bound states in the continuum for both engineering and enhancing the nonlinear response. We study experimentally the third-harmonic generation from metasurfaces composed of symmetry-broken silicon meta-atoms and reveal that the harmonic generation intensity depends critically on the asymmetry parameter. We employ the concept of the critical coupling of light to the metasurface resonances to uncover the effect of radiative and nonradiative losses on the nonlinear conversion efficiency.

Subfields: Biomedical Engineering, Civil and Structural Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/d68e2069c3e093fb1bfa42b1e328039b7b0d8efc

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In Biomedical Engineering

1. C. T. Chan
2. Meng Kang
3. M. Xiao
4. Tao Liu
5. Chin-teh Sun
6. H. H. Huang
7. Ankit Srivastava

In Electronic, Optical and Magnetic Materials

1. M. Xiao
2. Meng Kang
3. Tao Liu
4. C. T. Chan
5. Ankit Srivastava
6. Douglas H. Werner
7. Do-Hoon Kwon

Citations in the corpus

• Applications of bound states in the continuum in photonics (2023, methodology): “Increasing Q dis by reducing material loss can further increase the field enhancement achieved at the critical-coupling condition 66,67 .”