Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-27-6-8596
Timestamp: 2019-04-20 16:35:29+00:00

Document:
We propose theoretically and verify experimentally a method of using electrically tunable liquid crystal q-plate and wave plate for generating arbitrary vector vortex beams on a hybrid-order Poincaré sphere (HyOPS). The generated vector vortex beam is verified and shows decent agreement with the prediction. This method brings many advantages, such as high conversion efficiency, good electrical controllability, and integration. This system can provide fundamental optical system support for various structured beam applications.
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Fig. 1 Schematic illustration of the HyOPS.
Fig. 2 (a). The system to generate arbitrary vector vortex beams. (b). The system to measure the relationship between retardation and the voltage across the cell.
Fig. 3 The relationship between the parameter and the voltage. Cell information: spacer: 4 μm, photoalignment material: 0.5% SD1, LC material: 5CB.
Fig. 4 Experiment setup for the patterned photo-alignment.
Fig. 5 Polarization and intensity distribution of the theoretical and experimental results of vector vortex beams (The left pictures of each points are theoretical results).
Table 1 Applied voltages and spherical coordinates in the HyOPS of each case shown in Fig. 5.
(6) |ψ〉= 2 2 ( e ^ x +iσ e ^ y )exp( ilφ ).
(8) |ψ〉=cos δ 2 2 2 ( e ^ x +iσ e ^ y )exp( ilφ )+sin δ 2 ( e ^ x −iσ e ^ y ) ×exp( imφ )exp[ i( 2σ α 0 − π 2 ) ]exp(iΓ) .
(11) s 3 = I( −45°,0° )−I( 45°,0° ) I( −45°,0° )+I( 45°,0° ) .
Applied voltages and spherical coordinates in the HyOPS of each case shown in Fig. 5.

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