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The still unknown azobenzene - Wavelength dependent photoanisotropy in amorphous azobenzene polymers

P. S. Ramanujam, Ole Bjarlin Jensen, and Peter Tidemand-Lichtenberg

Open Access Open Access

Abstract

We demonstrate a new type of anisotropy in thin films of amorphous azobenzene polymers induced between 570 and 633 nm, where the absorbance in the film is on the order of 0.05. The anisotropy has a pronounced radial contribution. This observation points to an additional mechanism for the alignment of azobenzene molecules.

©2013 Optical Society of America

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Supplementary Material (1)

Media 1: AVI (4646 KB)     

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Figures (10)
Fig. 1
Fig. 1 Absorption spectra of the azobenzene polyester E1aP(0.25)12(0.75) before and after irradiation at 593 nm. The film thickness was approximately 2.5 μm. (a) Spectrum of the unirradiated film and (b) spectrum of film irradiated at 593 nm for 150 min., at a power density of approximately 5 mW/cm2.

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Fig. 2
Fig. 2 Polarization microscope picture of E1aP(0.25)12(0.75) irradiated at 532 nm with horizontal polarization. The film was rotated by 45° to obtain the above image.

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Fig. 3
Fig. 3 Polarization microscope picture of E1aP(0.25)12(0.75) irradiated at 593 nm with horizontal polarization. The polarization direction of irradiation coincides with the linear polarization direction of the microscope. The axis of the λ/4 plate does not coincide with axis of the polarizer, resulting in the orange-green color of the lobes.

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Fig. 4
Fig. 4 A close up (200 x) view of the central area of Fig. 3. The white dots are dust on the film.

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Fig. 5
Fig. 5 Same film as in Fig. 3 but rotated through + 45⁰ with the axis of the quarter wave plate exactly at the extinction axis of the analyzer.

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Fig. 6
Fig. 6 A time series of the development of anisotropy in E1aP(0.25)12(0.75) as a function of time (top row followed by bottom row). The entire series takes approximately 4 mins.

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Fig. 7
Fig. 7 A representative frame from the appended movie showing the temporal development of the anisotropy. [Media 1]

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Fig. 8
Fig. 8 Polarized microscope image after the completion of the irradiation.

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Fig. 9
Fig. 9 Image obtained when the film was irradiated with horizontally polarized light at 633 nm. The image was obtained on a screen placed after a crossed linear polarizer.

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Fig. 10
Fig. 10 Polarization microscope picture of the area irradiated at 670 nm. The film is at 45° to the polarization direction.

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