Lenslet-array-based snapshot hyperspectral imaging polarimeter using opposite spectral modulation

Abstract

We present a lenslet-array-based snapshot hyperspectral imaging polarimeter (LSHIP) that integrates spectral polarization modulation (SPM) into integral field imaging spectrometry. The LSHIP can simultaneously acquire three-dimensional spatial and spectral data-cubes for linear Stokes parameters in a single snapshot without any moving parts. The dual-scan technique is achieved through a custom-fabricated Wollaston prism that can simultaneously generate pairs of micro-spectra with opposite spectral modulations, maintaining the system's intrinsic spectral resolution during intensity spectrum reconstruction. We describe the principle and experimental setup of the LSHIP, as well as the system calibration and validation using measurements of polarized color blocks and a sphere made of polytetrafluoroethylene material. The prototype can cover the spectral range of 450–650 nm with 157 sample points, capturing approximately 3700 SPM micro-spectra spatially distributed on the detector in a single integration time. These results demonstrate the potential of the LSHIP for various applications, including remote sensing and biomedical diagnosis.