Single laser beam-induced surface deformation on azobenzene polymer films

Bian, Shaoping; Li, L.; Kumar, Jayant; Kim, D. Y.; Williams, John; Tripathy, Sukant K.

doi:10.1063/1.122292

Cited by 161 publications

(111 citation statements)

References 8 publications

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“…10,11,[26][27][28] The photoisomerization of the molecules in glassy state creates a mobile heterogeneity inside the film. 29 A similar discussion should be applicable to SR formation in the P1 film; the interferometric beam pattern must contain periodic linear polarization in a direction parallel to the grating vector for a sufficient SR structure.…”

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confidence: 99%

“…This phenomenon is similar to SR formation in azobenzene-containing polymeric films; the periodical degree of the photoisomerization and p-polarized component of the interferometric beams play important roles in molecular migration. 10,11,26 Polarization holography simultaneously generated both SR formation and periodic molecular reorientation according to the interferometric polarization pattern. When two circularly polarized beams with opposite circularity (±CP) were employed, periodic bright lines with a half-pitch ( = 1.58 μm) were observed in the POM observations, and the formed SR height was 200 nm (Fig.…”

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confidence: 99%

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Photoinduced reorientation and polarization holography in a new photopolymer with 4-methoxy-N-benzylideneaniline side groups

Kawatsuki¹,

Matsushita²,

Kondo³

et al. 2013

Apl Materials

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The photoinduced reorientation and surface relief (SR) formation behaviors of a novel photosensitive polymer, which was transparent in visible region, were investigated using linearly polarized-313-nm light and holographic exposure with a 325-nm He-Cd laser. The polymer was comprised of photosensitive 4-methoxy-N-benzylideneaniline side groups, and exhibited a sufficient photoinduced molecular reorientation with a birefringence of 0.11. Holographic exposure generated a SR structure, which had a periodical molecular reorientation that depended on the polarization of the interference beams. The generated SR height was ∼212 nm, and the inscription of a double holographic exposure yielded a two-dimensional SR structure

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confidence: 99%

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confidence: 99%

Photoinduced reorientation and polarization holography in a new photopolymer with 4-methoxy-N-benzylideneaniline side groups

Kawatsuki¹,

Matsushita²,

Kondo³

et al. 2013

Apl Materials

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“…3 They propose a mechanism based on the interaction between the electric field of light and induced dipoles in the polymers. The interaction can generate forces, which seem to be essentially the same as that induced in the optical alignment of laser-trapped particles in fluids.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3] Some of them are caused by temperature rises induced with light absorption, 1 while in covalent chalcogenide glasses and other materials such as organic solids, some kinds of athermal processes appear. 2,3 In these materials, deformation seems to occur through photo-electro-atomic coupling processes, while the detailed mechanisms remain to be studied. It should also be mentioned that some responses to light in biological systems may also be regarded as kinds of systematic photo-electro-atomic deformations.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced surface deformations in ion-conducting Ag–As–S glasses. II. Anisotropic deformation produced by large light spots

Gotoh

Tanaka

2001

Journal of Applied Physics

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Anisotropic surface deformations appear in AgAsS 2 chalcogenide films when exposed to linearly polarized 2.0 eV light spots with diameters of 5-200 m. The anisotropic shape reflects the polarization direction. The shape also changes with the direction of light incidence. Illumination on the free surface of the films gives a craterlike deformation, and illumination through a substrate gives an anticrater deformation. In bulk samples, under any exposure conditions, an isotropic convex structure appears. The formation mechanisms of these patterns are discussed taking into account the photoinduced migration of Ag ϩ ions.

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“…with a polarization in the beams incidence plane. In this configuration the polarization axes are perpendicular to the fringes of the interference pattern, in order to favor a migration of the material from the high intensity regions of the interference pattern to the low ones [31]. The HepG2 (human hepatoblastoma) and HeLa (human ovarian cancer) cells were maintained at 37°C, in RPMI medium supplemented with 10% fetal calf serum, 50 units/ml penicillin, 50 µg/ml streptomycin and 2 mM GlutaMAX (Gibco ® Cell Culture, USA) in a 5% CO 2 atmosphere.…”

Section: Experimental Partmentioning

confidence: 99%

Rigid and flexible azopolymers modified with donor/acceptor groups. Synthesis and photochromic behavior

Luca¹,

Rocha²,

Resmeriță³

et al. 2011

Express Polym. Lett.

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Azobenzene-containing polymers have received increasing attention due to their unique properties allowing various applications, such as in micro-fluidic or in membrane based separation systems, to optically change the materials surfaces wettability [1][2][3][4][5], in biology, to generate photosensitive micellar systems for drug delivery purposes, for example [6,7], in optics or optoelectronics, to generate optical switching and data storage functions [8][9][10][11][12][13]. The distinct properties of these materials are attributed to the photo-isomerization of azobenzene molecules which undergo reversible trans-cis isomerization of the double bond [14], under external stimuli. It should be emphasized that isomerization of the azobenzene is accompanied by large changes in both geometry and dipole moment [15][16][17][18][19]. These photo responsive properties are determined by both azo-chromophore structure and polymeric architecture. One of the most interesting applications is connected to the possibility to induce a certain type of relief on the surface of azo-polymeric film, by laser irradiation, [20][21][22]. This surface nano-structura- Abstract. The aim of this work is to investigate the photochromic behavior and nano-structuration capacity of azo-polymers with different architectures and main chain flexibilities, modified with donor/acceptor groups. As a function of the chemical structure and the substitution degree, the azo-polymers can generate physical interactions and lead to different polymer chain conformational re-organization under optical excitation. Nano-structuration experiments were performed on samples with different chemical structures. Surface relief gratings have been realized both in poly(chloromethyl styrene) and polysiloxanes polymers. The complexity of the phenomena that take place under optical excitation of the azo-benzene molecules are reflected by the samples behavior during the nano-structuration process. Preliminary tests to determine the ability of the azo-polysiloxanic films to support cell growth were performed. The films showed remarkable properties to sustain both cell adhesion and proliferation.

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Single laser beam-induced surface deformation on azobenzene polymer films

Cited by 161 publications

References 8 publications

Photoinduced reorientation and polarization holography in a new photopolymer with 4-methoxy-N-benzylideneaniline side groups

Photoinduced reorientation and polarization holography in a new photopolymer with 4-methoxy-N-benzylideneaniline side groups

Photoinduced surface deformations in ion-conducting Ag–As–S glasses. II. Anisotropic deformation produced by large light spots

Rigid and flexible azopolymers modified with donor/acceptor groups. Synthesis and photochromic behavior

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