High-sensitivity material with reversible photo-induced anisotropy

Тодоров, Т.; Tomova, N.; Nikolova, L.

doi:10.1016/0030-4018(83)90099-8

Cited by 119 publications

(41 citation statements)

References 4 publications

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“…(14)- (16) to derive the system of kinetic equations from Eqs. (10)- (13). The result is given by n cis ∂f cis ∂t = n tr P tr tr ( f iso − f cis ) , (17a) n tr ∂f tr ∂t = ( P tr tr − P tr ) n tr f tr + (γ c + q c I)…”

Section: Modelmentioning

confidence: 99%

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Kinetics of photoinduced anisotropy in azopolymers: models and mechanisms

Kiselev

2002

J. Phys.: Condens. Matter

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We consider the effect of photoinduced optical anisotropy (POA) in azopolymers. Using a unified approach to the kinetics of photo-reorientation we discuss the assumptions underlying the known theoretical models of POA and formulate a tractable phenomenological model in terms of angular redistribution probabilities and order parameter correlation functions. The model takes into account biaxiality effects and long term stability of POA in azopolymers. It predicts that under certain conditions two different mechanisms, photoorientation and photoselection, will dominate POA depending on the wavelength of pumping light. By using available experimental data, we employ the model to compute dependencies of principal absorption coefficients on the illumination time. Our calculations clearly indicate the different regimes of POA and the numerical results are found to be in good agreement with the experimental data.

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Section: Modelmentioning

confidence: 99%

“…In particular, as opposed to the reversible POA, where anisotropy disappears after switching off the irradiation [12,13,14,15,16], POA can be long term stable. This is the case for POA in liquid crystalline (LC) azopolymers.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of photoinduced anisotropy in azopolymers: models and mechanisms

Kiselev

2002

J. Phys.: Condens. Matter

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“…Formation of holographic gratings in films of poly(vinyl alcohol) doped with low-molecular-weight AZ compounds was first reported by utilizing photoisomerization of AZs (Todorov et al, 1983(Todorov et al, , 1984(Todorov et al, , 1985. The holographic gratings recorded in the polymer-based samples were selfdeveloping and auto-erasing or re-writable since the thermally induced back isomerization of AZs could be easily obtained (Pham et al, 1997).…”

Section: Low-molecular-weight Azsmentioning

confidence: 99%

Azobenzene-Containing Materials for Hologram

Yu¹,

Kobayashi²

2011

Holograms - Recording Materials and Applications

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“…Photochemical reactions have potential applicability to photo-optical switching devices, because they change the electronic structure of the molecules and the density of the system (22)(23)(24)(25). The change in refractive indices and the anisotropy of PMMA (poly(methyl methacrylate)) films containing DAAB (pKiimethylaminoazobenzene) were measured during polarized-light-induced photoisomerization, and the possibility as a photo-optical controlling material was examined (26).…”

Section: η )mentioning

confidence: 99%

Photophysics, Photochemistry, and Photo-optical Effects in Polymer Solids

Horie

1995

ACS Symposium Series

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Photophysics, photochemistry, and optical phenomena of polymers for microelectronics are closely related to one another. By using polyimides as typical examples, it is discussed how photophysics such as charge transfer process affects photochemistry such as photosensitivity of polyimides. Photochemistry such as photoisomerization induces the change in refractive indices providing the phase modulation in optical devices. Microstructure of a polymer liquid crystal is also elucidated by fluorescence spectroscopy.The interaction of light with materials is one of the fundamental subjects in natural science and technology. Phenomena related to light are called in Japanese "hikari" by using a single word, but there are one word and two prefixes concerned with light in English; "light", "photo-" and "opto-". Photochemistry and photophysics deal with the change in materials by light which usually chemists are interested in, and optics deal with the change in light by materials which has been developed mainly by physicists (i). Both aspects of the interaction between light and materials as well as their hybrid phenomena will become more and more important in the field of polymers for microelectronics and photonics. Typical examples of the materials with hybrid phenomena are photorefractive polymers where non-linear optical effects are induced by the space charge generated by the photoirradiation of photoconductive polymers (2) and a command surface where the alignment of nematic liquid crystals are controlled by photoisomerization of azobenzene layer (3). Several examples of photo-and optofunctional materials are summarized in Table I.Polyimides (PI) are well-known because of their excellent thermal stability, and they have become important as high temperature insulation materials in the microelectronics field. They are also expected to be potential materials for various thermostable microelectronics and photonics devices. In the present paper, we use polyimides as typical materials for studying photophysics, photochemistry, optical phenomena and their relations in polymer solids, and report several recent results of the charge-transfer (CT) fluorescence study of aromatic polyimides, the influence of CT state on the photochemistry of photosensitive polyimides, third-order non-linear optical properties of aromatic polyisoimides, and photochemically-induced optical effects in dye-doped polymer films. Charge-transfer and dimer fluorescence studies have also been applied to polymer liquid crystals.

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High-sensitivity material with reversible photo-induced anisotropy

Cited by 119 publications

References 4 publications

Kinetics of photoinduced anisotropy in azopolymers: models and mechanisms

Kinetics of photoinduced anisotropy in azopolymers: models and mechanisms

Azobenzene-Containing Materials for Hologram

Photophysics, Photochemistry, and Photo-optical Effects in Polymer Solids

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