Even-order optical harmonics generated from centrosymmetric-material metasurfaces
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917705021390848 |
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| author | Tonkaev, Pavel Lai, Fangxing Kruk, Sergey Song, Qinghai Scalora, Michael Koshelev, Kirill Kivshar, Yuri |
| author_facet | Tonkaev, Pavel Lai, Fangxing Kruk, Sergey Song, Qinghai Scalora, Michael Koshelev, Kirill Kivshar, Yuri |
| contents | Generation of even-order optical harmonics requires noncentrosymmetric structures being conventionally observed in crystals lacking the center of inversion. In centrosymmetric systems, even-order harmonics may arise, e.g., at surfaces but such effects are usually very weak. Here we observe optical harmonics up to 4-th order generated under the normal incidence from centrosymmetric dielectric metasurfaces empowered by resonances. We design silicon metasurfaces supporting optical quasibound states in the continuum and guided-mode resonances, and demonstrate the enhancement of second-harmonic signals by over three orders of magnitude compared to nonresonant thin films. Under the optimal conditions, the brightness of the second harmonic approaches that of the third harmonic, and the 4th-order harmonic becomes detectable. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_19385 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Even-order optical harmonics generated from centrosymmetric-material metasurfaces Tonkaev, Pavel Lai, Fangxing Kruk, Sergey Song, Qinghai Scalora, Michael Koshelev, Kirill Kivshar, Yuri Optics Generation of even-order optical harmonics requires noncentrosymmetric structures being conventionally observed in crystals lacking the center of inversion. In centrosymmetric systems, even-order harmonics may arise, e.g., at surfaces but such effects are usually very weak. Here we observe optical harmonics up to 4-th order generated under the normal incidence from centrosymmetric dielectric metasurfaces empowered by resonances. We design silicon metasurfaces supporting optical quasibound states in the continuum and guided-mode resonances, and demonstrate the enhancement of second-harmonic signals by over three orders of magnitude compared to nonresonant thin films. Under the optimal conditions, the brightness of the second harmonic approaches that of the third harmonic, and the 4th-order harmonic becomes detectable. |
| title | Even-order optical harmonics generated from centrosymmetric-material metasurfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2403.19385 |