Photo-induced birefringence in polymeric devices functionalized with azobenzene dyes (Conference Presentation)

Adriano J. G. Otuka; Vinicius Tribuzi; Bruno B. M. Torres; Debora T. Balogh; Leonardo De Boni; Cleber R. Mendonça

doi:10.1117/12.2508788

5 March 2019 Photo-induced birefringence in polymeric devices functionalized with azobenzene dyes (Conference Presentation)

Adriano J. G. Otuka, Vinicius Tribuzi, Bruno B. M. Torres, Debora T. Balogh, Leonardo De Boni, Cleber R. Mendonça

Author Affiliations +

Proceedings Volume 10915, Organic Photonic Materials and Devices XXI; 109150T (2019) https://doi.org/10.1117/12.2508788
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

The reversible photoisomerization and consequent molecular orientation of azobenzene dyes are observed when these compounds are irradiated by specific wavelengths. Due to these attractive properties, these organic dyes have been the subject of several studies, aiming applications in optics and photonics devices. In this work, we functionalized acrylate resins with a series of azobenzene dyes to fabricate optically active devices which are sculpted via multiphoton absorption polymerization (MAP). For the experiments reported here, the host resin consists in two acrylate monomers namely tris(2-hydroxyethyl)isocyanurate triacrylate and ethoxylated(6) trimethylolpropane triacrylate, combined in equal proportion. These monomers are then mixed to a variety of azobenzene dyes: Disperse Red 1, Disperse Red 13, Disperse Red 19 and Disperse Orange 03. These dyes were added in weight percentages ranging from 0.05 to 1 wt%. In our experiment, a small amount of dye also works as a photoinitiator to start the polymerization process. In this case, the dominant reaction usually involves the loss of a molecule of N2 followed by reactions with the monomers. However, the remaining dye is unaffected by the laser beam, maintaining its optical properties, as can be observed after the complete fabrication procedure. Using a dedicated system we evaluate the photoinduced birefringence of these structures. To observe the light transmission through the device, placed between crossed polarizer and analyzer, we used a 0.25-NA microscope objective and a CCD camera. Through the analysis of the birefringence time-evolution curves, we observed significant residual optical memory, essential feature for micro-optical storage devices.

Conference Presentation

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Adriano J. G. Otuka, Vinicius Tribuzi, Bruno B. M. Torres, Debora T. Balogh, Leonardo De Boni, and Cleber R. Mendonça "Photo-induced birefringence in polymeric devices functionalized with azobenzene dyes (Conference Presentation)", Proc. SPIE 10915, Organic Photonic Materials and Devices XXI, 109150T (5 March 2019); https://doi.org/10.1117/12.2508788

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KEYWORDS

Birefringence

Polymers

Optical storage

Polymerization

Absorption

Active optics

Laser therapeutics

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