Optimized simultaneous generation of dual-wavelength phase and polarization singularities

Optical singularities have gained significant importance for their unique phase and polarization properties, leading to their versatile applications in optical communication, imaging, and information processing. Most of the reported techniques for the generation of singularities use a single wavelength of light, which limits their applications for multi-spectral scenarios. As a solution, the present study demonstrates a technique to create optical singularities at multiple wavelengths of light simultaneously. The technique requires optimization of a liquid crystal spatial light modulator for phase modulation of light at multiple wavelengths through a single encoded gray-scale pattern. Simultaneous generation of phase and polarization singularities at wavelengths of 532 nm and 635 nm has been demonstrated to verify the technique.