Abstract
We have studied theoretically the spin–orbit interaction of light for a nonparaxial light beam generated upon focusing a well defined polarized Gaussian beam using microscope objective lens of high numerical aperture (NA). A detailed theoretical analysis of field spectrum containing nonparaxial rays was done by incorporating the Debye–Wolf approximation in the diffraction integral of focused field. The electric field vector in the real space incorporating the nonparaxial rays given by Debye integral was calculated for the beams of input polarizations - TM, TE, linear ±45°, right and left circular, in the focused plane of lens. Then the spin–orbit interaction was studied by numerically simulating the intensity distribution and analysing the Stokes parameters for polarization modulation using the derived electric vector components.
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