Broadband Angular-selective Mid-infrared Photodetector
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910921430925312 |
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| author | Fan, Ziwei Hwang, Taeseung Chen, Yixin Wong, Zi Jing |
| author_facet | Fan, Ziwei Hwang, Taeseung Chen, Yixin Wong, Zi Jing |
| contents | Mid-infrared photodetectors are susceptible to background noise since every object in the surroundings emits thermal radiation from different directions. To reduce this background noise and enhance signal-to-noise ratio of mid-infrared sensing, different strategies to achieve angular-selective filtering have been proposed. However, these methods are either wavelength- and polarization-dependent, or require bulky lens or mirror systems. The former compromises the photodetector sensitivity, and the latter makes it difficult to integrate with wearable or on-chip devices. In this study, we present a novel angular-selective microstructure array that can seamlessly integrate onto a mid-infrared photodetector. Our compact device leverages the conservation of etendue to attain high angular selectivity over a broad range of mid-infrared wavelengths. Radiation from unwanted angles is substantially filtered, which leads to a markedly enhanced photodetection signal-to-noise ratio. Furthermore, the device's photoresponse is shown to be polarization- and wavelength-insensitive, avoiding signal losses associated with narrow spectral ranges or polarization dependence, and therefore circumventing degradation in photodetector sensitivity. Our broadband angular-selective mid-infrared photodetector holds great promise for wearable devices, medical diagnostics and space applications. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_13927 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Broadband Angular-selective Mid-infrared Photodetector Fan, Ziwei Hwang, Taeseung Chen, Yixin Wong, Zi Jing Optics Applied Physics Mid-infrared photodetectors are susceptible to background noise since every object in the surroundings emits thermal radiation from different directions. To reduce this background noise and enhance signal-to-noise ratio of mid-infrared sensing, different strategies to achieve angular-selective filtering have been proposed. However, these methods are either wavelength- and polarization-dependent, or require bulky lens or mirror systems. The former compromises the photodetector sensitivity, and the latter makes it difficult to integrate with wearable or on-chip devices. In this study, we present a novel angular-selective microstructure array that can seamlessly integrate onto a mid-infrared photodetector. Our compact device leverages the conservation of etendue to attain high angular selectivity over a broad range of mid-infrared wavelengths. Radiation from unwanted angles is substantially filtered, which leads to a markedly enhanced photodetection signal-to-noise ratio. Furthermore, the device's photoresponse is shown to be polarization- and wavelength-insensitive, avoiding signal losses associated with narrow spectral ranges or polarization dependence, and therefore circumventing degradation in photodetector sensitivity. Our broadband angular-selective mid-infrared photodetector holds great promise for wearable devices, medical diagnostics and space applications. |
| title | Broadband Angular-selective Mid-infrared Photodetector |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2503.13927 |