Small dosage of holographic exposure via a He-Ne laser to fabricate tunable liquid crystal phase gratings operated with low electric voltages

Chien, Chun Yu; Sheu, Chia Rong

doi:10.1080/02678292.2016.1247475

Cited by 5 publications

(2 citation statements)

References 35 publications

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“…Furthermore, NVP was also considered as the photocurable monomer and varied percentages with respect to RM257 to improve electro-optical performance of PNLC cells. Except E7, the chemical structures of all other ingredients are shown in [22]. Figure 1a illustrates the setup for processing holographic exposure, where a red He-Ne laser beam (λ = 632.8 nm, LASOS, Jena, Germany) serially passed through the attenuator, polarizer, and beam expander to achieve an s-polarization light beam with controllable intensity and optical quality.…”

Section: Methodsmentioning

confidence: 99%

Doping Liquid Crystal Cells with Photocurable Monomer via Holographic Exposure to Realize Optical-Scattering-Free Infrared Phase Modulators with Fast Response Time

Chien

Sheu

2017

Crystals

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Photocurable monomer-doped liquid crystal (LC) cells were processed via holographic exposure using a low-power He-Ne laser to generate holographic polymer networks. The polymer network LC (PNLC) cells are used to fabricate infrared phase modulators at 1550 nm wavelength possessing favorable electro-optical performance. Compared with our previous work, the percentages of ingredients in the LC mixture filled in PNLC cells underwent a slight change. The 2 wt% concentration of anisotropic monomer RM257 were in place of isotropic monomer N-vinyl-2-pyrrolidinone (NVP). As a result, the fabricated phase modulators also maintained well homogeneous LC alignments and optical-scattering-free characteristics. Furthermore, NVP dopant successfully reduced the operating voltages from 95 V rms to 79 V rms to prevent polymer network deformation when electrically operating with higher voltages. The fabricated infrared phase modulators had a good average response time (i.e., rising time of 0.88 ms and falling time of 0.40 ms).

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Section: Methodsmentioning

confidence: 99%

Doping Liquid Crystal Cells with Photocurable Monomer via Holographic Exposure to Realize Optical-Scattering-Free Infrared Phase Modulators with Fast Response Time

Chien

Sheu

2017

Crystals

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“…Apart from the improved response time, some research studies have emphasized that the optical performance of fabricated devices is dependent on the type of monomer structures used and the fabrication process [ 14 , 15 , 16 , 17 , 18 , 19 ]. By using isotropic monomers to fabricate polymer dispersed LC (PDLC) cells for applications such as light shutters and switchable windows [ 18 , 19 ], it is usually shown that they possess optical polarization-independence.…”

Section: Introductionmentioning

confidence: 99%

Photo-Polymerization in Chiral Dopant Liquid Crystal Cells via Holographic Exposure to Fabricate Polarization-Independent Phase Modulator with Fast Optical Response

2018

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Small liquid crystal domains with random director distributions were obtained to show novel optical isotropy using a holographic exposure processes to treat chiral dopant liquid crystal cells in the isotropic phase (i.e., polymer-stabilized isotropic liquid crystal cells). The cells used to fabricate phase modulators showed unique performances, including low light scattering, polarization-independence, and fast optical response. Furthermore, an extra fluoro-surfactant dopant in cells showed that the phase modulators retained their performance but with considerable reduction of operating voltages, from 180 V rms to 100 V rms .

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Morphology, electro-optical and dielectric properties of polymer network liquid crystals in visible wavelengths

Hsu

et al. 2018

Liquid Crystals

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Small dosage of holographic exposure via a He-Ne laser to fabricate tunable liquid crystal phase gratings operated with low electric voltages

Cited by 5 publications

References 35 publications

Doping Liquid Crystal Cells with Photocurable Monomer via Holographic Exposure to Realize Optical-Scattering-Free Infrared Phase Modulators with Fast Response Time

Doping Liquid Crystal Cells with Photocurable Monomer via Holographic Exposure to Realize Optical-Scattering-Free Infrared Phase Modulators with Fast Response Time

Photo-Polymerization in Chiral Dopant Liquid Crystal Cells via Holographic Exposure to Fabricate Polarization-Independent Phase Modulator with Fast Optical Response

Morphology, electro-optical and dielectric properties of polymer network liquid crystals in visible wavelengths

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