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In the recent past, optical tweezers incorporating a stratified medium havebeen exploited to generate complex translational and rotational dynamics inmesoscopic particles due to the coupling between the spin and orbital angularmomentum of the light, generated as a consequence of the tight focusing oflight by a high numerical aperture objective lens into the stratified medium.Here, we consider an optical tweezers system with a tilted stratified medium(direction of stratification at an angle with the axis of the incident beam),and show that for input circularly polarized Gaussian beams, the resultingspin-orbit interaction deeply influences the generation of transverse spinangular momentum (TSAM) and Belinfante momentum of light, and allows additionalcontrol on their magnitude. Importantly, the TSAM generated in our systemconsists of both the orthogonal components, which is in sharp contrast to thecase of evanescent waves and surface plasmons, where only one of the TSAMcomponents are generated. The broken symmetry due to the tilt ensures that,depending upon the helicity of the input beam, the magnitude of the mutuallyorthogonal components of the TSAM depend entirely on the tilt angle. This mayprove to be an effective handle in exotic spin-controlled manipulation ofparticles in experiments.

Manipulating the transverse spin angular momentum and Belinfante momentum of spin-polarized light by a tilted stratified medium in optical tweezers