Generation of arbitrary vector beams with liquid crystal polarization converters and vector-photoaligned q-plates

• DOI: 10.1063/1.4937592
• Publication Date: 2015-12-14T18:00:57Z
• Authors: Peng Chen; Wei Ji; Bing-Yan Wei; Wei Hu; Vladimir Chigrinov; Yan-Qing Lu
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Arbitrary vector beams (VBs) are realized by the designed polarization converters and corresponding vector-photoaligned q-plates. The polarization converter is a specific twisted nematic cell with one substrate homogeneously aligned and the other space-variantly aligned. By combining a polarization-sensitive alignment agent with a dynamic micro-lithography system, various categories of liquid crystal polarization converters are demonstrated. Besides, traditional radially/azimuthally polarized light, high-order and multi-ringed VBs, and a VB array with different orders are generated. The obtained converters are further utilized as polarization masks to implement vector-photoaligning. The technique facilitates both the volume duplication of these converters and the generation of another promising optical element, the q-plate, which is suitable for the generation of VBs for coherent lasers. The combination of proposed polarization converters and correspondingly fabricated q-plates would drastically enhance the capability of polarization control and may bring more possibilities for the design of photonic devices.