Electrically switchable and optically rewritable reflective Fresnel zone plate in dye-doped cholesteric liquid crystals

Cheng, Kuo-Hsing; Liu, Cheng-Kai; Ting, Chi Lun; Fuh, Andy Ying–Guey

doi:10.1364/oe.15.014078

Cited by 47 publications

(32 citation statements)

References 14 publications

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“…The photoalignment technique ensures that LCs are typically aligned on a substrate by irradiating the surface that contains photoreactive molecules with a linearly polarised light (visible or ultraviolet light). Over the past decades, the experimental results of anchoring transition caused by several external factors, such as temperature, [11] electric field [12] and photoisomerisation, [7,[13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Each of these materials induces a distinct phenomenon. Several azo dyes, either embedded into the polymer film, [3,7,13] or dissolved in LC mixtures, [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] exhibit effective anchoring transition via illumination with polarised light. One of the effects of photoalignment involves the light-induced reorientation of the azobenzene chromophore, which is promoted by trans-cis isomerisation cycles.…”

Section: Introductionmentioning

confidence: 99%

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Effect of surface condition on liquid crystal photoalignment by light-induced azo dye adsorption phenomena

et al. 2016

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The effect of surface condition on the photoalignment of light-induced methyl red (MR) adsorption phenomena on various substrates based on azo dye-doped liquid crystals is investigated. The results show that the polar surface energy determines the initiation of MR adsorption phenomena. The surface polarity energy of different substrates, which are modulated by oxygen plasma treatment (OPT), is further examined using the sessile drop method. The results also indicate that the uniformity and efficiency of MR adsorption can be enhanced by OPT. Light intensity influences the MR adsorption rate. The uniformity of MR adsorption onto various substrates is analysed via polarised optical microscopy. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of surface condition on liquid crystal photoalignment by light-induced azo dye adsorption phenomena

et al. 2016

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“…In recent decade, cholesteric LCs (CLCs), also known as chiral nematic LCs, have been studied by many scientists [18][19][20][21][22][23]. CLCs usually consist of nematics and a chiral dopant, as well as have two stable textures, planar (P) and focal conic (FC) textures.…”

Section: (E) Cholesteric Reflection Modementioning

confidence: 99%

Liquid Crystal Display—Present Status and Emerging Technology

Cheng

2014

Topics in Applied Physics

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Nowadays, in your daily lives, the applications of LCs, such as LCD TVs, computer/laptop monitors, mobile phones, navigators, digital cameras, and so on, are widely used worldwide. Even, wherever you are whatever you do, you can take your electronics out of your pocket to check your e-mails, listen to music, watch movies, find your way, and so many others. LCDs provide high performance in regard to the weight, volume, contrast ratio, viewing angle, low power consumption, etc. That's why the high-quality applications of LCDs are indispensable and paid much attention by scientists and electronics industries in the recent decade. Undoubtedly, LCDs have acted as a leader in the field of flat panel displays, in not only small-sized displays, but also large-sized ones. Refer to cathode ray tube (CRT) monitors; LCDs have almost completely replaced CRT monitors in the display market because of their bulky and high power consumption, despite their good response time, viewing angle, image quality. However, in addition to the present status of LCD applications, some emerging technologies, such as wide viewing angle displays, fast response displays, blue phase LCDs, flexible displays, 3D displays, high resolution displays, in-cell touch panel, electronic papers, tablets, etc., have also attracted much attention. In this chapter, the introductions of the present status of LCD industry, as well as the emerging technology for improving the performances of LCDs will be given. Liquid Crystal Display ModesRegarding the commercial products of LCDs [1-3], their operating principles for modulating light intensity and/or light polarization include polarization

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“…The combination of bulk-mediated hybrid photoalignment and homeotropic alignment in a single pixel supports the fabrication of LCDs with a controllable viewing-angle, [52] on which simultaneously displays two images that can be seen from different viewing angles. Other applications in photonic devices, such as optical gratings [53][54][55] and Fresnel lenses have also been investigated [56][57][58][59][60]. Photoalignment is a unique tool for achieving LC alignment in mechanically inaccessible volumes.…”

Section: Bulk-mediated Photo-isomerization and Adsorption Effectsmentioning

confidence: 99%

Photo-Alignment Technology

Lin

2014

Topics in Applied Physics

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LCDs are used in many everyday devices, including mobile phones, notebook computers and wide screen televisions. A typical LCD is composed of two glass substrates between which is a gap that is filled with LC. The arrangement of the LC is controlled by the boundary condition of an alignment film. A long-range orientational interaction causes the preferable alignment of a LC by the surface boundary to extend into the LC bulk. The alignment layer is typically rubbed with a special cloth to induce a unidirectional alignment of the LC. In the first devices based on twisted LCs, these LCs were aligned only by rubbing transparent electrodes. The rubbing technique became much more reliable when the glass substrate was covered with a rubbed polymer layer. The rubbing of polymers is a very simple technique and it is now extensively utilized in both small scientific laboratories and large LCD factories.Despite the extensive use of rubbing in LCD manufacturing, it has some serious shortcomings that arise from the contact involved in rubbing. These critically affect the production of the most recent generation of LCDs and miniature LC photonic devices. First, rotational rubbing for the polymer surface causes the accumulation of static charges and the formation of fine dust particles. The accumulation of static electricity may destroy the transistors or diodes in the LCD. The second shortcoming is the effect of decreasing in manufacturing yield. Rubbing for large and high-resolution active matrix LCDs (AMLCDs) involve additional difficulties that are associated with the precise control of the rubbing characteristics. Other problems are the difficulty of producing local structures with the required LC director alignment in the selected areas of the device. Finally, this method cannot be used to align LCs in closed volumes.For all of the above reasons, new alignment solutions and approaches are sought. There are some alternative methods of rubbing include laser writing, micro-rubbing, ion beam irradiation and photoalignment. Of these methods, the

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Electrically switchable and optically rewritable reflective Fresnel zone plate in dye-doped cholesteric liquid crystals

Cited by 47 publications

References 14 publications

Effect of surface condition on liquid crystal photoalignment by light-induced azo dye adsorption phenomena

Effect of surface condition on liquid crystal photoalignment by light-induced azo dye adsorption phenomena

Liquid Crystal Display—Present Status and Emerging Technology

Photo-Alignment Technology

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