Kerr modulators based on polymer-dispersed liquid crystal complexes

Nizioł, Jacek; Węgłowski, Rafał; Kłosowicz, Stanisław J.; Majchrowski, A.; Rakus, P.; Wojciechowski, A.; Kityk, I.V.; Tkaczyk, S.; Gondek, E.

doi:10.1007/s10854-010-0056-4

Cited by 11 publications

(9 citation statements)

References 17 publications

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“…1(b). When the voltage is applied to both devices, the LC molecules reorient along the field direction due to either the Kerr effect [11,12] or molecular orientations [13], so that an optical birefringence is induced, resulting in a bright state. However, we expect a slight increase in an operating voltage in the twisted-OILC because an additional electrical energy to unwind twisted LC is required.…”

Section: Experiments and Resultsmentioning

confidence: 99%

P‐142: High Performance Optically Isotropic Liquid Crystal Display using Twisted Liquid Crystals for Flexible LCDs

Song

Yoo

Lee

et al. 2018

Symp Digest of Tech Papers

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Optically isotropic polymer/liquid crystal (OILC) composite film in which nano-sized liquid crystal droplets are embedded in a polymer matrix with minimal scattering is proposed for flexible LCDs with high contrast ratio, fast response time and wideviewing-angle. Feeble light scattering in conventional OILC is overcome utilizing cholesteric LC but limiting its pitch larger than LC droplets, giving rise to higher contrast ratio. In this paper, we reports on electro-optic studies of OILC cells having various pitch sizes, exhibiting an outstanding dark state and improved transmittance.

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Section: Experiments and Resultsmentioning

confidence: 99%

P‐142: High Performance Optically Isotropic Liquid Crystal Display using Twisted Liquid Crystals for Flexible LCDs

Song

Yoo

Lee

et al. 2018

Symp Digest of Tech Papers

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“…They obtained a higher value of the two-photon absorption (TPA) coefficients than those of BiBO crystals [23,24]. They observed substantial influence of the single-laser phototreatment on the behavior of the photoinduced changes in the nanocrystallites of LCB incorporated into the liquid crystallines [26]. In 2010, Miedzinski et al studied the optically induced changes in absorption in polymer-dispersed liquid crystals doped with LCB nanocrystallites.…”

Section: Other Applications Of Lcbmentioning

confidence: 99%

“…In 2007, the ab initio calculations were performed on LCB, and the energy band structure, DOS, and frequency-dependent linear and nonlinear optical responses were obtained [25]. This effect may be used for operation by the principal parameters of the LC containing electrooptical cells, especially for nonlinear optics [26]. They observed substantial influence of the single-laser phototreatment on the behavior of the photoinduced changes in the nanocrystallites of LCB incorporated into the liquid crystallines [26].…”

Section: Other Applications Of Lcbmentioning

confidence: 99%

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Other Borate Crystals

Chen

Sasaki

et al. 2012

Nonlinear Optical Borate Crystals

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A series of mixed borates of rare-earth elements and calcium with the composition R 2 CaB 10 O 19 (RCB) (R: rare-earth element) were synthesized by Wu et al., from the system of R 2 O 3 -CaO-B 2 O 3 in 1998 [1]. In 2001, the growth and structure of La 2 CaB 10 O 19 (LCB), one member of the RCB family, was reported [2]. LCB crystallizes in the monoclinic system and belongs to the C2 space group with two formula units per cell (Figure 4.1). Its lattice parameters were measured to be a ¼ 11.043 (3) The structure contains B 5 O 12 groups as the basic units. B 5 O 12 groups are linked together to form an infinite two-dimensional double layer by sharing O atoms with one another. The layer runs almost perpendicular to the caxis of the crystal. The La atoms are located in layers, while the Ca atoms are located between two layers. LCB crystal has a high transparency from ultraviolet (UV) to infrared range. The birefringence of LCB crystal at 1064 nm is 0.053, which allows to perform SHG and THG in LCB. The damage threshold was measured to be about 11.5 GW/cm 2 . An effective nonlinear optical coefficient d eff of LCB was measured to be 1.05 pm/V. In addition, LCB can be doped with other rare earth (RE) elements because of the existence of the La 3þ ions in LCB. So LCB is a promising nonlinear optical (NLO) and self-frequency doubling (SFD) crystal. Synthesis and Crystal Growth of LCB and RE:LCBIn 1998, a series of compounds with the composition R 2 CaB 10 O 19 (R: rare earth) including the LCB crystals were synthesized from the stoichiometric melt. In 2000, the Nd 3þ -doped LCB (Nd:LCB) with a size of 20 Â 17 Â 7 mm 3 was grown from the Nonlinear Optical Borate Crystals: Principles and Applications, First Edition. Nd 3þ was used to replace the La 3þ in LCB using different Nd concentrations to form Nd:LCB. For LCB RE:LCB crystal growth, flux method is convenient because the crystal decomposes above 900 C before melting at 1200 C. In 2002, pure LCB was grown from its stoichiometric melt by the top-seeded pulling method (TSSG, topseeded solution growth) by Xu et al. [4]. The morphology of LCB grown by TSSG method was then studied [5]. In 2003, Wu et al. studied the phase diagram of the binary system LaB 3 O 6 -CaB 4 O 7 by X-ray powder diffraction and differential thermal (DSC) analysis, and they found that LCB phase exists between lanthanum borate and calcium borate, and melts congruently with a melting point of 1065 C [6]. Thereafter, a series of rare earth-doped LCB such as Er:LCB [7,8], Ce:LCB [9], Nd,Yb:LCB [10], and Pr:LCB [11,12] were successfully grown by flux and TSSG method. To further enlarge the size and improve the optical quality of LCB crystals, people made more efforts to improve the crystal growth equipment and the growth conditions. For example, in 2005, Jing et al. made efforts to search for the new flux to grow LCB crystals and successfully grew the LCB with size of 30 Â 25 Â 9 mm from a new flux CaO-Li 2 O-B 2 O 3 [13]. It was also found that the morphological faces are most effected by the direction of ...

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“…The optical phase of PDLC, in general, belongs to one of an optically isotropic liquid crystal (OILC) phase modulations as long as PDLC is operated in the pure optical phase region as the voltage is larger than certain bias voltage (V b ). Recently, Niziol reported the Kerr effect of PDLC which means the birefringence of PDLC can be induced under external electric fields, not just orientational birefringence [29]. Therefore, an interest arises from studying the optical phase of PDLC, especially when the droplet size is smaller than wavelength of incident light.…”

Section: Introductionmentioning

confidence: 99%

Electrically tunable microlens arrays based on polarization-independent optical phase of nano liquid crystal droplets dispersed in polymer matrix

Yu¹,

Chen²,

Chen³

et al. 2015

Opt. Express

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Electrically tunable focusing microlens arrays based on polarization independent optical phase of nano liquid crystal droplets dispersed in polymer matrix are demonstrated. Such an optical medium is optically isotropic which is so-called an optically isotropic liquid crystals (OILC). We not only discuss the optical theory of OILC, but also demonstrate polarization independent optical phase modulation based on the OILC. The experimental results and analytical discussion show that the optical phase of OILC microlens arrays results from mainly orientational birefringence which is much larger than the electric-field-induced birefringence (or Kerr effect). The response time of OILC microlens arrays is fast~5.3ms and the tunable focal length ranges from 3.4 mm to 3.8 mm. The potential applications are light field imaging systems, 3D integrating imaging systems and devices for augment reality.

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Kerr modulators based on polymer-dispersed liquid crystal complexes

Cited by 11 publications

References 17 publications

P‐142: High Performance Optically Isotropic Liquid Crystal Display using Twisted Liquid Crystals for Flexible LCDs

P‐142: High Performance Optically Isotropic Liquid Crystal Display using Twisted Liquid Crystals for Flexible LCDs

Other Borate Crystals

Electrically tunable microlens arrays based on polarization-independent optical phase of nano liquid crystal droplets dispersed in polymer matrix

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