Forming radially and azimuthally polarized beams can be created by intereferometry, intra cavity summation of two beams or by using space-variant metal stripe gratings. However, all of these methods are either somewhat cumbersome, unstable or have low efficiency.
Computer-generated space-variant subwavelength dielectric gratings for the formation of radially and azimuthally polarized light were realized on GaAs substrates and produced beams with a polarization purity of 99.2% at a wavelength of 10.6 µ¬m.
By correctly determining the direction, period and depth of the grating, any desired continuous polarization can be obtained. Furthermore the continuity of our grating ensures the continuity of the transmitted field, thus suppressing diffraction effects that may rise from discontinuity. Our gratings are compact, lightweight, flexible in design and have high transmission efficiency.
- Polarization purity and continuity
- Compact, lightweight gratings
- Flexible design
Applications and Opportunities
- High-resolution microscopy
- Optical trapping
- Material processing