Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-15-25-16645
Timestamp: 2019-04-19 04:22:00+00:00

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A computer-generated hologram designed to generate an optical vortex was recorded in a cell filled with polymer-dispersed liquid crystal material under a collimated Ar+laser beam operating at 514.5 nm. Owing to the photopolymerization-induced phase separation between the polymer and the liquid crystal, an index modulation was formed between the polymer-rich and liquid crystal-rich regions. A good optical vortex beam with high fidelity was reconstructed using a collimated He-Ne laser beam. The diffraction efficiency is estimated to be about 13%–17%. With a suitable voltage applied, the reconstructed optical vortex beam can be switched owing to the index change between the polymer and the liquid crystal.
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Fig. 1. Binary transparency masks fabricated with the topological charge of (a) m=1, (b) m=2, and (c) m=3, respectively. Inset in (a) shows the resolution in the magnified image of (a).
Fig. 2. Optical setup to reconstruct the image from PDLC OVs.
Fig. 3. Central optical microscopic images of CGH masks and PDLC CGH for (a) and (b) where m=1, (c) and (d) where m=2, and (e) and (f) where m=3, respectively.
Fig. 4. Photographs of the reconstructed OV without voltage applied for (a) m=1, (b) m=2,and (c) m=3, respectively.
Fig. 5. Photographs of the reconstructed OV at (a) V=0, and (b) V=70 Vrms, respectively.

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