用超薄衍射元件实现高精度光谱偏振成像,体积小且性能优。
Integrated diffractive full-Stokes spectro-polarimetric imaging
- 设计可端到端训练的衍射偏振光谱元件,融合深度网络重建数据立方体。
- 在400-700nm波段实现10nm分辨率、2252×2252像素高空间分辨率。
- 系统厚度仅2毫米,光谱保真度超98.9%,适合便携式光学检测应用。
光谱偏振成像能获取多维光学信息,具有广泛应用潜力。现有系统普遍存在体积大、设计复杂、成本高或需替换标准组件的问题。为此,我们提出一种集成衍射全斯托克斯光谱偏振成像框架,将端到端设计的衍射偏振光谱元件(DPSE)与SPMSA-Net结合,实现高性能成像。DPSE对场景调制并生成携带相位编码和偏振信息的调制图像,输入SPMSA-Net以重建光谱偏振数据立方体。该框架相比现有最优算法,平均提升0.78 dB PSNR和0.012 SSIM。基于此框架的原型系统可同时捕获400–700 nm波段、10 nm光谱分辨率的全斯托克斯参数(S0, S1, S2, S3),空间分辨率达2252×2252像素。实验表明,系统实现超过98.9%保真度的高保真光谱成像与精确偏振表征,整体架构紧凑,调制部件厚度仅2毫米。
原文摘要 · Abstract (English)
Spectro-polarimetric imaging provides multidimensional optical information acquisition capabilities, offering significant potential for diverse applications. Current spectro-polarimetric imaging systems typically suffer from large physical footprints, high design complexity, elevated costs, or the drawback of requiring replacement of standard components with polarization optics. To address these issues, we propose an integrated diffractive full-Stokes spectro-polarimetric imaging framework that synergistically combines end-to-end designed diffractive polarization spectral element (DPSE) with SPMSA-Net to demonstrate high-performance spectro-polarimetric imaging. The DPSE modulates scene and generates modulated images carrying phase-encoding and polarization information. The modulated images are the input of the SPMSA-NET for the reconstruction of the spectro-polarimetric data cube. The framework achieves an average improvement of 0.78 dB in PSNR and 0.012 in SSIM over existing state-of-the-art algorithms. Based on this framework, our prototype system can simultaneously capture spectral information (400-700 nm) with 10 nm spectral resolution and full-Stokes parameters (S0,S1,S2,S3). Meanwhile, the system provides high spatial resolution of 2252*2252 pixels. Experimental results demonstrate that our system achieves high-fidelity spectral imaging (over 98.9% fidelity) and precise polarization characterization, with a compact architecture (modulation component of merely 2-mm thickness).
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