Infrared Liquid Crystal Light Valve

Wu, Shin‐Tson; Efron, Uzi; Grinberg, J.; Hess, L. D.; Welkowsky, M.

doi:10.1117/12.950678

Cited by 11 publications

(5 citation statements)

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“…Besides display applitheir physical properties. cations, such materials are thought to be applicable to laser beam steering [7] and infrared spatial modulators [8].…”

Section: Introductionmentioning

confidence: 99%

Novel high birefringence dibenzothiophenylacetylene liquid crystals

Sekine¹,

Ishitobi²,

Iwakura³

et al. 2002

Liquid Crystals

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We have designed, synthesized and evaluated dibenzothiophenylacetylene homologues as new heterocyclic molecules which were expected to have high Da values and short wavelength UV absorption spectra. The dibenzothiophenyl acetylene homologues exhibited wide nematic phase ranges and had very high extrapolated Dn of over 0.6 and directly measured values of 0.5. The compounds with two dibenzothiophenyl rings were colourless, so that we have succeeded in obtaining colourless super-high Dn liquid crystals. We have also analysed the contribution of the transition band to the refractive indices and the birefringence. From the analysis, the main origins of Dn for compounds 1 and 2 are lower MOs than the HOMO and this results in the compatibility of large Dn and lack of colour. The dibenzothiophenylacetylene compounds behaved according to our design expectations.

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“…Besides display applitheir physical properties. cations, such materials are thought to be applicable to laser beam steering [7] and infrared spatial modulators [8].…”

Section: Introductionmentioning

confidence: 99%

Novel high birefringence dibenzothiophenylacetylene liquid crystals

Sekine¹,

Ishitobi²,

Iwakura³

et al. 2002

Liquid Crystals

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“…Besides based on phenylacetylen e and containing molecules highly display applications, these materials are thought to be conjugated along the molecular long axis [17][18][19]. They applicable to laser beam steering [7] and infrared spatial exhibited high values of Dn as expected, but were not modulators [8].…”

Section: Introductionmentioning

confidence: 97%

Synthesis and properties of some novel high birefringence phenylacetylene liquid crystal materials with lateral substituents

Sekine¹,

Iwakura²,

Konya³

et al. 2001

Liquid Crystals

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We have synthesized and investigated new 3-ring phenylacetylene liquid crystals with high birefringence values (Dn) to improve the nematic temperature range while retaining a high optical anisotropy. In the case of modifying the terminal ring, the introduction of branched alkoxy chains, uorine or methyl groups shifted the nematic phase to lower temperatures. In order to minimize the in uence of the substituent on Dn, the incorporation of lateral methyl groups was chosen as the most pro table method for obtaining wide and low temperature nematic phases. With these results in mind, we studied the eOE ect of the position of the methyl group on the physical properties. The most eOE ective methyl position for improving the nematic temperature range was on the central ring. From the standpoint of obtaining high Dn values and low viscosity, the central ring was also the best position. Introductionof Dn. 2,6-Disubstitute d naphthyl-ethyny l moieties were synthesized and investigated [14]. They exhibited high Liquid crystals (LCs) which exhibit high values ofDn values of about 0.3, but showed a high temperature birefringence (Dn) are useful components in liquid crystal nematic phase. 2,6-Naphthynyl-2,5-pyridiny l ethynes mixtures. They are employed in the conventional super exhibited similar properties. Terminal groups which twisted nematic (STN) and in high response STN-LCDs could contribute towards a high value of Dn were also with a narrow cell gap as Dn moderators. The value of investigated. 2,6-Disubstitut ed naphthy l homologues conDn required is around 0.15-0.18 so that LCs having taining a terminal cyano-substituen t have high Dn values moderate Dn values are contained in such mixtures. of over 0.4 [15]. Isothiocyana to-substitute d biphenyls were Recently, the remarkable development of multimedia synthesized and the terminal group was shown to give technology has created a strong demand for high pera higher Dn than the cyano group [16]. Unfortunately formance mobile displays. High Dn liquid crystals are compounds containing these moieties exhibited high attractive materials for bright re ective displays including melting points and low solubilities. PDLCDs [1, 2], cholesterics [3], holographi c switching We have developed durable high Dn liquid crystals devices [4] and directional re ectors [5, 6]. Besides based on phenylacetylen e and containing molecules highly display applications, these materials are thought to be conjugated along the molecular long axis [17-19]. They applicable to laser beam steering [7] and infrared spatial exhibited high values of Dn as expected, but were not modulators [8]. suitable for practical use because of high transition It is well known that a high Dn value can be achieved temperatures and poor solubility. by increasing the molecular conjugation length [9]. A In this study, we have focused on a 3-ring phenylconsiderable number of p-conjugated compounds have acetylene (3PA) core which yields materials having high been developed as high Dn liquid crystals [10, 13].Dn values and wide ...

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“…Apart from these display applications, these materials are also useful for laser beam steering using optical phased arrays and for spatial light modulators [7][8][9]. The Dn values of the LC materials are determined mainly by their electron conjugation, differential oscillator strength and order parameter [10].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and mesomorphic properties of fluoro and isothiocyanato biphenyl tolane liquid crystals

et al. 2006

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Four series of high birefringence biphenyl tolane liquid crystals having a terminal isothiocyanato or fluoro group were synthesized; their mesomorphic properties were studied by optical polarizing microscopy and DSC. These biphenyl tolane compounds exhibit reasonably low melting points and high birefringence of 0.37-0.49. By using these compounds a eutectic mixture was formulated exhibiting a wide nematic range, high figure-of-merit and low viscosity.

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Infrared Liquid Crystal Light Valve

Cited by 11 publications

References 0 publications

Novel high birefringence dibenzothiophenylacetylene liquid crystals

Novel high birefringence dibenzothiophenylacetylene liquid crystals

Synthesis and properties of some novel high birefringence phenylacetylene liquid crystal materials with lateral substituents

Synthesis and mesomorphic properties of fluoro and isothiocyanato biphenyl tolane liquid crystals

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