Synthesis and properties of azo dye aligning layers for liquid crystal cells

Chigrinov, Vladimir G.; Prudnikova, Elena K.; Kozenkov, Vladimir M.; Kwok, Hoi Sing; Akiyama, Hidenari; Kawara, Tatsuo; Takada, Hirokazu; Takatsu, Haruyoshi

doi:10.1080/713935610

Cited by 178 publications

(62 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…15 The grating pitch was 20 mm with a duty cycle of 50%. Photo-sensitive SD1 (Dainippon Ink and Chemicals Inc., Chiba, Japan) 27 was dissolved in N,N-dimethylformamide (DMF) at a concentration of 0.5 wt-%. The solution was spin coated onto the substrates coated with the UVO-treated graphene and the sub-wavelength metal wire grid at 3000 r.p.m.…”

Section: Fabricationmentioning

confidence: 99%

See 1 more Smart Citation

Broadband tunable liquid crystal terahertz waveplates driven with porous graphene electrodes

et al. 2015

View full text Add to dashboard Cite

Versatile devices, especially tunable ones, for terahertz imaging, sensing and high-speed communication, are in high demand. Liquid crystal based components are perfect candidates in the optical range; however, they encounter significant challenges in the terahertz band, particularly the lack of highly transparent electrodes and the drawbacks induced by a thick cell. Here, a strategy to overcome all these challenges is proposed: Few-layer porous graphene is employed as an electrode with a transmittance of more than 98%. A subwavelength metal wire grid is utilized as an integrated high-efficiency electrode and polarizer. The homogeneous alignment of a high-birefringence liquid crystal is implemented on both frail electrodes via a non-contact photo-alignment technique. A tunable terahertz waveplate is thus obtained. Its polarization evolution is directly demonstrated. Furthermore, quarter-wave plates that are electrically controllable over the entire testing range are achieved by stacking two cells. The proposed solution may pave a simple and bright road toward the development of various liquid crystal terahertz apparatuses.

show abstract

Section: Fabricationmentioning

confidence: 99%

“…However, similar to the case of ITO, there is always a tradeoff between resistivity and transmittance. Moreover, in this study, a photo-alignment technique 27,28 was applied to achieve precise and stable homogeneous alignment and to avoid any mechanical damage to either of the frail electrodes.…”

mentioning

confidence: 99%

Broadband tunable liquid crystal terahertz waveplates driven with porous graphene electrodes

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Hence, the azo dye molecules can be oriented by using linearly polarized ultraviolet light easily. Many previous publications have shown that these azo compounds have excellent alignment properties for liquid crystal molecules [5][6][7][8], for example, thin alignment layer, low exposure dose, good thermal-stability, high anchoring energy, small residual direct current and large voltage holding ratio. However, the main problem of azo dye is the stability problems, especially the poor photo-stability [9].…”

Section: Introductionmentioning

confidence: 98%

67.3: Photo‐stable Azo Dye Photoalignment Polymer Surface for In Plane Switching Liquid Crystal Displays

Tseng

Lee

Yaroshchuk

et al. 2015

Symp Digest of Tech Papers

View full text Add to dashboard Cite

show abstract

“…The photoalignment technique is regarded as a promising method in liquid crystal alignment because of the high anchoring energy, good uniformity, small residual current and large voltage holding ratio [9][10].…”

Section: Introductionmentioning

confidence: 99%