Nonlinear chiral response from linearly achiral membrane metasurfaces
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| Soggetti: | |
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| _version_ | 1866913996111609856 |
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| author | Tonkaev, Pavel Zhuang, Yeqi Kim, Donghwee Toftul, Ivan Yamaguchi, Takeshi Li, Kingfai Huang, Jiaming Wang, Heng Tanaka, Takuo Park, Hong-Gyu Li, Guixin Kivshar, Yuri |
| author_facet | Tonkaev, Pavel Zhuang, Yeqi Kim, Donghwee Toftul, Ivan Yamaguchi, Takeshi Li, Kingfai Huang, Jiaming Wang, Heng Tanaka, Takuo Park, Hong-Gyu Li, Guixin Kivshar, Yuri |
| contents | Chiral photonics aims to control and engineer light handedness for many applications in optical communications, biological and chemical sensing, and quantum technologies. While traditional approaches focus on engineering strong linear chiroptical response, nonlinear chiral phenomena remain largely unexplored. Here, we demonstrate experimentally a pronounced nonlinear chiral response in free-standing silicon membrane metasurfaces that are effectively achiral in the linear regime. By employing patterned membranes with both $C_4$-symmetry and intentionally broken in-plane symmetry, we reveal that strong nonlinear circular dichroism can be observed in third-harmonic generation. An unperturbed metasurface exhibits strong cross-polarized third-harmonic signal with nonlinear circular dichroism of the value $-0.83$, whereas in-plane symmetry breaking enables a co-polarized channel, and it reverses the sign of nonlinear circular dichroism that may be as large as the value $0.41$. Our findings suggest a novel approach for engineering nonlinear chiral responses in metasurfaces, complementing traditional approaches and paving the way towards advanced chiral metadevices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_12719 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Nonlinear chiral response from linearly achiral membrane metasurfaces Tonkaev, Pavel Zhuang, Yeqi Kim, Donghwee Toftul, Ivan Yamaguchi, Takeshi Li, Kingfai Huang, Jiaming Wang, Heng Tanaka, Takuo Park, Hong-Gyu Li, Guixin Kivshar, Yuri Optics Chiral photonics aims to control and engineer light handedness for many applications in optical communications, biological and chemical sensing, and quantum technologies. While traditional approaches focus on engineering strong linear chiroptical response, nonlinear chiral phenomena remain largely unexplored. Here, we demonstrate experimentally a pronounced nonlinear chiral response in free-standing silicon membrane metasurfaces that are effectively achiral in the linear regime. By employing patterned membranes with both $C_4$-symmetry and intentionally broken in-plane symmetry, we reveal that strong nonlinear circular dichroism can be observed in third-harmonic generation. An unperturbed metasurface exhibits strong cross-polarized third-harmonic signal with nonlinear circular dichroism of the value $-0.83$, whereas in-plane symmetry breaking enables a co-polarized channel, and it reverses the sign of nonlinear circular dichroism that may be as large as the value $0.41$. Our findings suggest a novel approach for engineering nonlinear chiral responses in metasurfaces, complementing traditional approaches and paving the way towards advanced chiral metadevices. |
| title | Nonlinear chiral response from linearly achiral membrane metasurfaces |
| topic | Optics |
| url | https://arxiv.org/abs/2508.12719 |