Design of Dye Concentrations in Azobenzene-Containing Polymer films for Volume Holographic Storage

Minabe, Jiro; Maruyama, Tatsuya; Yasuda, Shin; Kawano, Katsunori; Hayashi, K.; Ogasawara, Yasuhiro

doi:10.1143/jjap.43.4964

Cited by 25 publications

(23 citation statements)

References 12 publications

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“…The mesoscopic morphologies created by polymer blends and/or block copolymers and photoalignment molecules are also used for anisotropic recording media. Synergetic effects were present in the holographic recording, leading to improved of diffraction efficiency with optical page data [102], large photo-induced birefringence and hologram stability [103], and achievement of high-density recording and the high-reproducibility in the cyclic recording and erasing process [104].…”

Section: Applicationsmentioning

confidence: 99%

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

2012

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Photocontrol of molecular alignment is an exceptionally-intelligent and useful strategy. It enables us to control optical coefficients, peripheral molecular alignments, surface relief structure, and actuation of substances by means of photoirradiation. Azobenzene-containing polymers and functionalized liquid crystalline polymers are well-known photocontrollable materials. In this paper, we introduce recent applications of these materials in the fields of mechanics, self-organized structuring, mass transport, optics, and photonics. The concepts in each application are explained based on the mechanisms of photocontrol. The interesting natures of the photocontrollable materials and the conceptual applications will stimulate novel ideas for future research and development in this field.

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Section: Applicationsmentioning

confidence: 99%

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

2012

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“…To solve these problems, Schmidt's group 32,71,72 designed polymer blends of block copolymers and polystyrene to obtain thick films and generate Bragg holograms with high angular multiplicity. Minabe et al 31 used blends of an azobenzene-containing polyester and a polyester with a photoinactive moiety to prepare transparent thick films. Amorphous random copolymers with functional components have also been designed.…”

Section: Bragg Holograms Of Liquid-crystalline Polymersmentioning

confidence: 99%

“…4,[12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] Recently, holographic recording in thick polymer films has been explored, aimed at developing holographic memory with high-density information storage. 31,32 In developing thick holograms known as Bragg holograms, angular multiplicity can be used. In addition, rewritable recording has been achieved, as the photoinduced changes are reversible using the azobenzene.…”

Section: Introductionmentioning

confidence: 99%

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Rewritable holograms based on azobenzene-containing liquid-crystalline polymers

Shishido

2010

Polym J

163

108

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The design and preparation of azobenzene-containing polymers showing a large photoinduced change in refractive index, and their applications to rewritable Raman-Nath and Bragg holograms are reviewed. Optically transparent films with a thickness of 4200 lm have been prepared with random copolymers, which contain photoresponsive and amplifying components in the side chain. Various azobenzene chromophores are used as the photoresponsive component. Cyanobiphenyl and tolane moieties are incorporated as the amplifying component, which enhances the change in refractive index triggered by the azobenzene. When two writing beams are made to overlap in the film, a periodic change in refractive index is induced, and an incident probe beam is diffracted at B100% diffraction efficiency. The recorded holograms can be erased by thermal treatment or by photoirradiation with a single writing beam. Angular multiplicity is discussed from the viewpoint of high-density information storage. Keywords: azobenzene; grating; hologram; liquid crystal; refractive index INTRODUCTION Holograms, in which we can observe natural three-dimensional (3D) images without eyeglasses, have been of great interest from the viewpoint of 3D television. [1][2][3] In addition, other photonic applications such as holographic memory, optical switch and waveguide have been proposed. [3][4][5][6][7][8][9] The holograms can be categorized into two types: (1) Raman-Nath type and (2) Bragg type. The Raman-Nath hologram recorded in a thin film causes multiple diffraction of an incident beam, leading to low diffraction efficiency (o34%). On the other hand, the Bragg hologram shows a single diffraction, which enables 100% diffraction efficiency. Furthermore, angular multiplicity can be used in the Bragg hologram. Therefore, thick films are suitable for holograms with high diffraction efficiency. The diffraction efficiency also depends on a photoinduced change in refractive index of the film. If materials in which a large change in refractive index can be induced by light can be prepared, the performances parameters such as diffraction efficiency, response and multiplicity of the holograms can be enhanced. How can we induce the change in refractive index efficiently? In an isotropic material, the change in refractive index by photoirradiation is rather small and the efficiency is not high. In addition, the material is theoretically polarization inactive. On the other hand, an anisotropic material could show birefringence. By controlling their molecular alignment by photoirradiation, a large change in refractive index and high diffraction efficiency can be obtained. Furthermore, an anisotropic material shows polarization activity. Therefore, we can expect the fabrication of high-performance holograms by photoinduced alignment of anisotropic molecules.

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“…The industrial synthesis of polymers exhibiting iridescent reflection [26][27][28][29][30][31][32][33][34][35] and diffraction [36][37][38][39][40][41][42][43][44] is of broad interest, with many potential applications of such biomimetic technology. In a previous study, the electrochemical preparation of poly(1,4-bis(2-(3,4-ethylenedioxy)thienyl)benzene (poly-BEDOT-B) showing selective reflection of white light and diffraction property was successfully performed using a CLC electrolyte [45].…”

Section: Introductionmentioning

confidence: 99%

Preparation of iridescent-reflective poly(furan-co-phenylene)s by electrochemical polymerization in a cholesteric liquid crystal medium

Yoneyama

Kawabata

Tsujimoto

et al. 2008

Electrochemistry Communications

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Abstract−Optically active poly(4,4'-di(2-furyl)biphenyl) is successfully prepared by asymmetric electrochemical polymerization in a cholesteric liquid crystal (CLC) electrolyte.The polymer thus obtained forms a fingerprint optical texture similar to that of the CLC electrolyte and a convexo-concave surface structure along the fingerprint pattern. The polymer displays iridescence under irradiation with white light, and circular diffraction upon laser irradiation.

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Design of Dye Concentrations in Azobenzene-Containing Polymer films for Volume Holographic Storage

Cited by 25 publications

References 12 publications

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

Rewritable holograms based on azobenzene-containing liquid-crystalline polymers

Preparation of iridescent-reflective poly(furan-co-phenylene)s by electrochemical polymerization in a cholesteric liquid crystal medium

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