We investigate the joint spectral-spatial dispersion effects on the spin-orbit interaction of light. The effect arises due to propagation of weakly focused linearly-polarized light beam through an elliptically birefringent quartz crystal plate (XP). We demonstrate via simulation and experiment a continuous and full rotation of the two-lobe intensity pattern around a phase singular point in the parameter space as a function of the incident beam wavelength (λ) and the fast-axis orientation (ϕ) of the XP. The joint spectral-spatial dispersion effect on the spin-orbit interaction of light further enhances our understanding of light-matter interaction and the emergence of topological behavior from a single crystal plate.
We explore phase and polarization singularity characteristics including the formation spiral and saddle pattern around V-singularity, due to propagation of converging-diverging beam of light through a tilted-rotated quartz half-waveplate. Such a system modifies the output beam characteristics significantly via coupled linear-circular birefringence experienced by a beam of light due to shape of the path – wave vector dependent Pancharatnam-Berry type geometric phase. Topological characteristics of the output beam for different input beam and waveplate orientation conditions are characterized using spatially-resolved Stokes parameter and weak measurement methods. Understanding the formation and manipulation of topologically structured optical beam using a single piece of optical component can pave the way to its widespread application.
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