Single-Shot Integrated Speckle Spectrometer with Ultrahigh Bandwidth-to-Resolution
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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_ | 1866912385431764992 |
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| author | Tian, Wenzhang Chen, Hao Zhang, Mingyuan Chen, Zengqi Tong, Yeyu |
| author_facet | Tian, Wenzhang Chen, Hao Zhang, Mingyuan Chen, Zengqi Tong, Yeyu |
| contents | Miniaturized spectrometers employing chip solutions are essential for a wide range of applications, such as wearable health monitoring, biochemical sensing, and portable optical coherence tomography. However, the development of integrated spectrometers is hampered by the inherent trade-off between bandwidth-to-resolution, footprint, sampling channels, and operation speed. Here, we demonstrate that an ultrahigh bandwidth-to-resolution reconstructive spectrometer can be easily implemented through a single image capture of the speckle pattern diffracted from a passive silicon photonic chip. By leveraging the high pixel count of an image sensor, we can instantly acquire a significant number of distinct spatial sampling channels. Those sampling channels are spatially decorrelated by using our passive optical network on chip including cascaded unbalanced Mach-Zehnder interferometers, random diffraction by an antenna array, and mutual interference in free space before being captured. Hence, each speckle pattern contains wavelength-specific information across its spatial distribution to enhance the effectiveness of the global sampling strategy. Experimentally, we achieve a spectral resolution of 10 pm and an operational bandwidth of 200 nm, with sampling channels up to 2730. Multiple unknown narrowband and broadband spectra can also be precisely obtained. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_15166 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Single-Shot Integrated Speckle Spectrometer with Ultrahigh Bandwidth-to-Resolution Tian, Wenzhang Chen, Hao Zhang, Mingyuan Chen, Zengqi Tong, Yeyu Optics Miniaturized spectrometers employing chip solutions are essential for a wide range of applications, such as wearable health monitoring, biochemical sensing, and portable optical coherence tomography. However, the development of integrated spectrometers is hampered by the inherent trade-off between bandwidth-to-resolution, footprint, sampling channels, and operation speed. Here, we demonstrate that an ultrahigh bandwidth-to-resolution reconstructive spectrometer can be easily implemented through a single image capture of the speckle pattern diffracted from a passive silicon photonic chip. By leveraging the high pixel count of an image sensor, we can instantly acquire a significant number of distinct spatial sampling channels. Those sampling channels are spatially decorrelated by using our passive optical network on chip including cascaded unbalanced Mach-Zehnder interferometers, random diffraction by an antenna array, and mutual interference in free space before being captured. Hence, each speckle pattern contains wavelength-specific information across its spatial distribution to enhance the effectiveness of the global sampling strategy. Experimentally, we achieve a spectral resolution of 10 pm and an operational bandwidth of 200 nm, with sampling channels up to 2730. Multiple unknown narrowband and broadband spectra can also be precisely obtained. |
| title | Single-Shot Integrated Speckle Spectrometer with Ultrahigh Bandwidth-to-Resolution |
| topic | Optics |
| url | https://arxiv.org/abs/2505.15166 |