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9 May 2018 Synthesis and nonlinear optics characterization of DAST submicron crystals in polymerized thin films
Tamara Pogosian, Thi Ngoc Anh Mai, Igor Denisyuk, Ngoc Diep Lai
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Proceedings Volume 10681, Micro-Structured and Specialty Optical Fibres V; 106811A (2018) https://doi.org/10.1117/12.2306686
Event: SPIE Photonics Europe, 2018, Strasbourg, France
Abstract
Highly nonlinear optical 4-(4-dimethylaminostyryl)-1-methylpyridinium tosylate (DAST) crystals have been successfully grown in micron scale and have been fixed in polymerized mixture of isodecyl acrylate (IDA) and trimethylolpropane ethoxylate (1 EO/OH) methyl ether diacrylate (TMP). The formation of DAST crystals in polymerized thin film (2 μm) was proceeded by three steps. Firstly, an evaporation of methanol during spincoating initiated crystalization. Secondly, polymerization by UV exposure in vacuum condition fixed crystals in matrix. Thirdly, annealing process at 80 °C completed crystals growth. It was evidenced that the ratio of IDA:TMP monomers strongly influenced on DAST crystals size (from 10 microns to submicron scale) and hence influenced on properties. The absorption and luminescence spectra and the second-harmonic generation signal confirmed surface morphology of DAST crystals, which is responsible for second-order nonlinear properties. Thus created thin film with DAST crystals is promising candidate for nonlinear optical applications, in particular those employing the quasi-phase matching method.
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Tamara Pogosian, Thi Ngoc Anh Mai, Igor Denisyuk, and Ngoc Diep Lai "Synthesis and nonlinear optics characterization of DAST submicron crystals in polymerized thin films", Proc. SPIE 10681, Micro-Structured and Specialty Optical Fibres V, 106811A (9 May 2018); https://doi.org/10.1117/12.2306686
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KEYWORDS
Crystals
Polymer thin films
Nonlinear crystals
Polymers
Thin films
Nonlinear optics
Second-harmonic generation
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