Complex Fourier demodulation approach for a partial and complete Stokes polarimeter

Le résumé fourni par la source

The detection of the Stokes vector is fundamental for understanding the polarization state of light, with applications in remote sensing, material characterization, and biomedical imaging. This work introduces a Fourier-based demodulation algorithm to calculate both partial and complete Stokes vectors using five distinct configurations composed of rotating analyzers and retarders. The algorithm leverages the theoretical Fourier transform of the detected intensity signal, where specific complex coefficients are mapped to individual Stokes parameters. To ensure accurate polarization state reconstruction, a robust calibration process was developed, accounting for angular misalignments and deviations in optical retardance. Experimental validation was performed using an RGB LED source, evaluating the detected intensity, the angle of linear polarization (AoLP), and the variation of the S3 parameter. RMS error values were computed to quantify the agreement between experimental and theoretical models. Results show that the polarimeter is composed of a rotating polarizer and the polarimeter rotating a quarter wave plate and a fixed polarizer exhibit the best performance in terms of intensity fitting and AoLP reconstruction. These findings demonstrate the viability of the proposed method for compact, precise, and flexible polarimetric analysis in practical systems.

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