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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2406.13970 |
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| _version_ | 1866910499979919360 |
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| author | Shao, Yifan Guo, Shuhan Chen, Rui Dang, Yongdi Zhou, Yi Wang, Yubo Zhan, Junjie Yu, Jiaqi Ju, Bing-Feng Ma, Yungui |
| author_facet | Shao, Yifan Guo, Shuhan Chen, Rui Dang, Yongdi Zhou, Yi Wang, Yubo Zhan, Junjie Yu, Jiaqi Ju, Bing-Feng Ma, Yungui |
| contents | The out-of-band energy loss caused by in-built color filters significantly degrades the signal-to-noise ratio and the dynamic range of conventional image sensors, which has restricted the attempt to develop ultrahigh-density imaging devices by merely shrinking the pixel size. This issue will be more serious for security cameras which need to collect visible (VIS) light and near-infrared (NIR) photons as well. The existing solutions mostly explore complex photonic nanostructures, which are often too complicated for production. In this work, we demonstrate a pixel-scale spectral router utilizing two-dimensional (2D) Si3N4 Mie scattering metagratings that can spatially divide NIR (850 nm) and VIS (400-700 nm) light to different pixels at high efficiencies. It has a minimum feature size larger than 360 nm, highly promising for massive production. Compared with the traditional filter design, our router can gain about 42% and 30% signal enhancement for NIR and VIS band, respectively. We show that it also has good polarization insensitivity and incident angle tolerance. The NIR-VIS simultaneous imaging is inspected without any complex reconstruction algorithm. Mode analysis indicates that the multipolar scattering of our Mie-type metagratings provides the necessary degrees of freedom to spatially optimize the routing functions for broadband photons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_13970 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Pixel-scale NIR-VIS Spectral Routers Based on 2D Mie-type Metagratings Shao, Yifan Guo, Shuhan Chen, Rui Dang, Yongdi Zhou, Yi Wang, Yubo Zhan, Junjie Yu, Jiaqi Ju, Bing-Feng Ma, Yungui Optics The out-of-band energy loss caused by in-built color filters significantly degrades the signal-to-noise ratio and the dynamic range of conventional image sensors, which has restricted the attempt to develop ultrahigh-density imaging devices by merely shrinking the pixel size. This issue will be more serious for security cameras which need to collect visible (VIS) light and near-infrared (NIR) photons as well. The existing solutions mostly explore complex photonic nanostructures, which are often too complicated for production. In this work, we demonstrate a pixel-scale spectral router utilizing two-dimensional (2D) Si3N4 Mie scattering metagratings that can spatially divide NIR (850 nm) and VIS (400-700 nm) light to different pixels at high efficiencies. It has a minimum feature size larger than 360 nm, highly promising for massive production. Compared with the traditional filter design, our router can gain about 42% and 30% signal enhancement for NIR and VIS band, respectively. We show that it also has good polarization insensitivity and incident angle tolerance. The NIR-VIS simultaneous imaging is inspected without any complex reconstruction algorithm. Mode analysis indicates that the multipolar scattering of our Mie-type metagratings provides the necessary degrees of freedom to spatially optimize the routing functions for broadband photons. |
| title | Pixel-scale NIR-VIS Spectral Routers Based on 2D Mie-type Metagratings |
| topic | Optics |
| url | https://arxiv.org/abs/2406.13970 |