Surface quasi periodic and random structures based on nanomotor lithography for light trapping

We compare the characteristics of two types of patterns obtained with two azopolymer materials: a Gaussian random pattern and a quasi-random grating pattern. The surface structurations have been obtained with a simple bottom-up technique, illuminating azopolymer thin films with a single laser beam....

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Bibliographic Details
Published in:Journal of applied physics 2017-07, Vol.122 (1)
Main Authors: Golghasemi Sorkhabi, Sh, Ahmadi-Kandjani, S., Cousseau, F., Loumaigne, M., Zielinska, S., Ortyl, E., Barille, R.
Format: Article
Language:English
Subjects:
Applied physics
Beam splitters
Elastomers
Entrapment
General Physics
Laser beams
Light
Physics
Thin films
Trapping
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Summary:We compare the characteristics of two types of patterns obtained with two azopolymer materials: a Gaussian random pattern and a quasi-random grating pattern. The surface structurations have been obtained with a simple bottom-up technique, illuminating azopolymer thin films with a single laser beam. We demonstrate the interesting generated properties of these two surfaces. In particular, the surface with quasi-random gratings can address beam splitting for light coupling in different directions in an ultra-thin film. We use these two surfaces as a mold and replicate them on a transparent elastomeric material and demonstrate a very good light entrapment. We also show that the efficiency of light trapping is 20% better with the quasi-random gratings, than with the Gaussian random surface, and is close to 40%.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4991480