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Lett."],"published-print":{"date-parts":[[2026,7,15]]},"abstract":"<jats:p>This work proposes the Embedded Interferometric Vortex Polarimetry (E-IVP), a technique that breaks the \u2018generate-first, interfere-later\u2019 scheme in interference-based polarimetry. Its basic concept is to utilize the intrinsic spin-to-orbital angular momentum conversion of vortex retarders to generate orthogonal OAM channels in a single beam, forming a compact common-path self-reference vortex interferometer without an external reference beam or additional optical components. This scheme avoids mechanical rotation and simplifies alignment, enabling single-shot and simultaneous retrieval of polarization parameters. Birefringence experiments confirm its performance. 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