Giant two-photon absorption response from a silicon quasi-BIC metasurface
We propose an amorphous silicon (a-Si) metasurface based on a quasi-bound state in the continuum (q-BIC) with a theoretical Q-factor up to 930, which consists of Π-like nanostructures with symmetrical defects. The influences of slot offset parameter and the size of added symmetric defect on the near...
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| Veröffentlicht in: | Applied physics letters 2023-11, Vol.123 (21) |
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| container_title | Applied physics letters |
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| creator | Xie, Hailun Gui, Lili Liu, Yiwen Lin, Fengbin Zhang, Zhongshan Xu, Kun |
| description | We propose an amorphous silicon (a-Si) metasurface based on a quasi-bound state in the continuum (q-BIC) with a theoretical Q-factor up to 930, which consists of Π-like nanostructures with symmetrical defects. The influences of slot offset parameter and the size of added symmetric defect on the near- and far-field characteristics of the metasurface have been analyzed. Due to local near-field enhancement by the tailored high-Q quasi-BIC resonance, our designed metasurface exhibits significantly enhanced two-photon absorption (TPA) response in the experiment, i.e., the TPA coefficient β0 = 173.2 cm/MW (3–4 orders of magnitude larger than a-Si film) and the TPA saturation intensity Isat = 93.0 MW/cm2. Our work offers a promising alternative scheme to improve nonlinear optical effects at the nanoscale. |
| doi_str_mv | 10.1063/5.0159139 |
| format | Article |
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The influences of slot offset parameter and the size of added symmetric defect on the near- and far-field characteristics of the metasurface have been analyzed. Due to local near-field enhancement by the tailored high-Q quasi-BIC resonance, our designed metasurface exhibits significantly enhanced two-photon absorption (TPA) response in the experiment, i.e., the TPA coefficient β0 = 173.2 cm/MW (3–4 orders of magnitude larger than a-Si film) and the TPA saturation intensity Isat = 93.0 MW/cm2. 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| fulltext | fulltext |
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| ispartof | Applied physics letters, 2023-11, Vol.123 (21) |
| issn | 0003-6951 1077-3118 |
| language | eng |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Amorphous silicon Applied physics Defects Far fields Metasurfaces Nonlinear optics Photon absorption Photons Silicon films |
| title | Giant two-photon absorption response from a silicon quasi-BIC metasurface |
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