Custom space-variant waveplates are space-variant retardance plates which enables tailored control of spatial polarization with retardance and predefined patterns of slow axis.
Production of custom space-variant waveplates for polarization conversion is based on unique laser nano-structuring technique developed by prof. Peter G. Kazansky group from Optoelectronics Research Centre at Southampton University.
Space-variant waveplates fabrication is based on inscription of self-organized nanogratings inside fused silica glass using a femtosecond laser. Rapid prototyping enables adaptation of every element to the specific needs of end user (slow axis and retardance distribution, structure clear aperture, substrate shape and thickness) without high additional development costs.
Current technology allows fabrication of SVW with retardance from R = 200 nm to R = 1000 nm. The wavelength range for which it is possible to fabricate λ/2 waveplates is λ = 400 nm to λ = 2 µm.
Beam intensity distribution after custom polarization converter at different incident polarization angles (left),polarization orientation in the beam (right)
Fig. 1 “Soft” aperture in cross polarized light
Fig. 4 Airy beam converter in cross polarized light
Fig. 2 Fresnel lens in cross polarized light
Fig. 3 Custom converter in cross polarized light
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