Refractive index modulation in polymeric photochromic films

Ortyl, Ewelina; Kucharski, S.

doi:10.2478/bf02479265

Cited by 16 publications

(8 citation statements)

References 29 publications

(39 reference statements)

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“…The average thickness is around 1 μm, and its absorbance has a maximum value of 1.9 at 438 nm (for more information, see [14]). Thus, for the purpose of registering the beam statistics into the film, a diode-pumped solid-state laser emitting at 473 nm is used to maximize the absorption of the azopolymer (the absorbance is 1.6).…”

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Simple turbulence measurements with azopolymer thin films

et al. 2013

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A simple method to measure the influence on the laser beam propagation by a turbid medium is proposed. This measurement is based on the inscription of a surface relief grating (SRG) on an azopolymer thin film. The grating obtained with a single laser beam after propagation into a turbulent medium is perturbed and directly analyzed by a CCD camera through its diffraction pattern. Later, by scanning the surface pattern with an atomic force microscope, the inscribed SRG is analyzed with the Radon transform. This method has the advantage of using a single beam to remotely inscribe a grating detecting perturbations during the beam path. A method to evaluate the refractive index constant structure is developed.

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Simple turbulence measurements with azopolymer thin films

et al. 2013

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“…Diazo containing chromophore, which was copolymer (IZO) contained 20 % of butyl methacrylate (BM) co-monomer [formula (VII)], was synthesized and characterized as it was described elsewhere [18].…”

Section: Methodsmentioning

confidence: 99%

“…Isomerization of the diazo group in the bright domains creates changes of dielectric properties of the polymer and it causes modulation of refractive index which results in a formation of a diffraction grating. Authors of this paper contributed to this subject developing series of sulfonamide containing diazobenzene monomeric and polymeric materials showing good photochromic properties [13][14][15][16][17][18]. All they contained heterocyclic sulfonamide fragments and their maximum absorption band was at ca.…”

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Refractive index modulation in films containing single and dual chromophore system

Kucharski¹,

Ortyl²

2006

Polimery

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Refractive index modulation in the films containing single and dual chromophore system Summary-Photochromic properties of polymer films containing spirooxazine (SP) and copolymer containing diazo chromophores (IZO) were investigated. The SP underwent photoisomerization under exposure to UV light yielding open forms of merocyanines manifested by strong absorption band at ca. 600 nm. The spectra of SP film in transparent polymer matrix, recorded for a single component and for a mixture with IZO copolymer, revealed sensitivity of the materials to UV and visible light. The ellipsometric measurements showed a distinct change of refractive index of the UV treated films on bleaching by exposure to the red and green light. Treatment of the film in two-beam coupling arrangement with 532 nm linearly polarized laser light confirmed the formation of diffraction grating. The study of photoizomerization was accompanied by quantum chemical calculations of spectral and nonlinear optical properties of spirooxazine and merocyanine forms.

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“…These were prepared by spin coating azobenzene (diluted in THF with a con-centration of 50mg/ml) on a glass substrate. The average thickness is around 1 m, and its absorbance has a maximum value of 1.9 at 438 nm-for more information see [13]. A coherent and linearly polarized light induces the formation of surface relief gratings on the azopolymer films; this phenomenon results from isomerization-induced translation in which the molecules migrate almost parallel to the polarization direction.…”

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confidence: 99%

Multifractal characteristics of optical turbulence measured through a single beam holographic process

Pérez¹,

Barille²,

Morille³

et al. 2014

Opt. Express

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Abstract:We have previously shown that azopolymer thin films exposed to coherent light that has travelled through a turbulent medium produces a surface relief grating containing information about the intensity of the turbulence; for instance, a relation between the refractive index structure constant C 2 as a function of the surface parameters was obtained. In this work, we show that these films capture much more information about the turbulence dynamics. Multifractal detrended fluctuation and fractal dimension analysis from images of the surface roughness produced by the light on the azopolymer reveals scaling properties related to those of the optical turbulence.

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Refractive index modulation in polymeric photochromic films

Cited by 16 publications

References 29 publications

Simple turbulence measurements with azopolymer thin films

Simple turbulence measurements with azopolymer thin films

Refractive index modulation in films containing single and dual chromophore system

Multifractal characteristics of optical turbulence measured through a single beam holographic process

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