Photoinduced surface relief grating formation using new polymers containing the same azobenzene chromophore as a photochoromic amorphous molecular material

Ando, Hiroyuki; Tanino, Takahiro; Nakano, Hideyuki; Shirota, Yasuhiko

doi:10.1016/j.matchemphys.2008.07.092

Cited by 33 publications

(27 citation statements)

References 27 publications

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“…The formation rate and feature of photoinduced surface relief gratings via the mass migration of azobenzene-containing amorphous materials differ between acrylate-and methacrylate-based polymers. 4 In liquid-crystal (LC) research, the effect of the main chain rigidity has also been a subject of fundamental interest. 5 In general, the more flexible main chain can offer a higher-order mesophase for polymers with an identical mesogenic group structure, and thus the isotropization temperature increases.…”

Section: ■ Introductionmentioning

confidence: 99%

Alternation of Side-Chain Mesogen Orientation Caused by the Backbone Structure in Liquid-Crystalline Polymer Thin Films

et al. 2015

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In side-chain-type liquid-crystalline (LC) polymers, the main chain rigidity significantly affects the LC structure and properties. We show herein a relevant new effect regarding the orientation of side-chain mesogenic groups of LC polymers in a thin-film state. A subtle change in the main chain structure, i.e., polyacrylate and polymethacrylate, leads to a clear alternation of mesogens in the homeotropic and planar modes, respectively. This orientational discrimination is triggered from the free surface region (film-air interface) as revealed by surface micropatterning via inkjet printing.

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Section: ■ Introductionmentioning

confidence: 99%

Alternation of Side-Chain Mesogen Orientation Caused by the Backbone Structure in Liquid-Crystalline Polymer Thin Films

et al. 2015

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“…When side-chain liquid crystalline polymers (SCLCPs) are employed, the mass transfer becomes highly efficient. The photon dose for the completion of migration [6,7,[9][10][11][12] becomes approximately 10 3 -fold lower than that for widely reported amorphous polymers [1][2][3] and amorphous molecular materials [13,14]. This can be ascribed to the occurrence of isothermal liquid crystal (LC) to isotropic phase transition in the process of trans-to-cis photoisomerization [6,7,11,[15][16][17].…”

Section: Introductionmentioning

confidence: 88%

SRG Inscription in Supramolecular Liquid Crystalline Polymer Film: Replacement of Mesogens

et al. 2017

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Abstract:The photoinduced surface relief formation via mass transfer upon irradiation with patterned light has long been a subject of extensive investigation. In azobenzene-containing liquid crystalline materials, UV light irradiation that generates the cis isomer leads to the liquid crystal to isotropic photochemical transition. Due to this phase change, efficiency of the mass transfer to generate a surface relief grating (SRG) becomes markedly greater. We have previously indicated that azobenzene-colored SRG-inscribed film can be bleached by removing a hydrogen-bonded azobenzene mesogen. However, this process largely reduces the height feature of the SRG corrugation. Herein, we propose an extended procedure where a colorless mesogen is filled successively after the removal of the azobenzene side chain. The process involves four stages: (i) SRG inscription in a hydrogen-bonded supramolecular azobenzene material; (ii) crosslinking (insolubilization) of the SRG film; (iii) removal of azobenzene mesogen by rinsing with a solvent, and (iv) stuffing the hollow film with a different mesogen. Although the final stuffing stage was insufficient at the present stage, this work demonstrates the possibility and validity of the strategy of mesogen replacement.

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“…Moreover, the formation of surface-relief gratings, which is usually peculiar of side-chain azobenzene polymers [118][119][120], has been recently demonstrated in PMMA films doped with a large content of spiropyran molecules [121,122].…”

Section: Figure 10mentioning

confidence: 99%

Control of optical properties through photochromism: a promising approach to photonics

Bianco

Perissinotto

Garbugli

et al. 2011

Laser & Photonics Reviews

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In this work studies on photochromism for optics and photonics are reviewed. The versatility of organic chemistry gives photochromic materials wide opportunities for several applications that range from tunable filters and gratings, to refractive-index modulators for optical fibers and communications, to optical memories and sensors. Moreover, novel results on efficient modulation of amplified emission in a conjugated polymer/photochromic system are presented. Credit for the background image (WR 25 and Tr16-244, open cluster Trumpler 16): NASA, ESA and Jesús Maíz Apellániz

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Photoinduced surface relief grating formation using new polymers containing the same azobenzene chromophore as a photochoromic amorphous molecular material

Cited by 33 publications

References 27 publications

Alternation of Side-Chain Mesogen Orientation Caused by the Backbone Structure in Liquid-Crystalline Polymer Thin Films

Alternation of Side-Chain Mesogen Orientation Caused by the Backbone Structure in Liquid-Crystalline Polymer Thin Films

SRG Inscription in Supramolecular Liquid Crystalline Polymer Film: Replacement of Mesogens

Control of optical properties through photochromism: a promising approach to photonics

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