MUMBAI, India, May 29 -- Intellectual Property India has published a patent application (202641042216 A) filed by Cvr College Of Engineering, Hyderabad, Telangana, on April 2, for 'phase shift enabled refractive index sensing with vector vortex beams using conjugate mode interferometer.'
Inventor(s) include Dr. C. Hari Krishna.
The application for the patent was published on May 29, under issue no. 22/2026.
According to the abstract released by the Intellectual Property India: "This invention presents a refractive index sensor that converts minute phase changes due to the sample into corresponding modifications in the spatial polarization structure of a vector vortex beam. A conjugate mode interferometer is used to generate vortex beams with opposite-topological-charge, orthogonally polarization. The sensing arm contains the sample material with tiltable arrangement. Refractive index of sample is determined by tilting and observing changes in the output vector beam's polarization distribution, which are quantified via spatially resolved Stokes polarimetry and global polarization parameters. The novelty of this method lies in directly exploiting the non-separable nature of spatial polarization structure of vector vortex beams, rather than scalar interference fringes, for refractometry. This approach offers robustness in intensity fluctuations, tunable sensitivity, compactness and waveplate-free implementation, and compatibility with the integrated or fiber platforms. Potential applications of this method include chemical and biochemical sensing, lab-on-chip diagnostics, and communication systems using structured light."
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