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Imbert-Fedorov (IF) shift, which refers to a tiny transverse splittinginduced by spin-orbit interaction at a reflection/refraction interface, issensitive to the refractive index of a medium and momentum state of incidentlight. Most of studies have focused on the shift for an incident light beamwith a spin angular momentum (SAM) i.e., circular polarization. Compared toSAM, orbital angular momentum (OAM) has infinite dimensions in theory as a newdegree of freedom of light and plays an important role in light-mattercoupling. We demonstrate experimentally that the relative IF shifts of vortexbeams with large opposite OAMs are highly enhanced in resonant structures whenlight refracts through a double-prism structure (DPS), in which the thicknessand temperature of the air gap are precisely sensed via the observed relativeIF shifts. The thickness and temperature sensitivities increase as the absolutevalue of opposite OAMs increases. Our results offer a technological andpractical platform for applications in sensing of thickness and temperature,ingredients of environment gas, spatial displacement, chemical substances anddeformation structure.

Enhanced opposite Imbert-Fedorov shifts of vortex beams for precise sensing of temperature and thickness