13 September 2007 Enhanced photoinduced birefringence in hydrogen-bonded guest-host polymers
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We show that hydrogen bonding between azo molecules and polymer host enhances the photoinduced optical anisotropy in azo-containing polymers without sacrificing the ease of processing of conventional guest-host systems. The primary mechanism behind the enhancement is the possibility to use high dye doping levels compared to conventional guest-host systems due to reduced aggregation tendency of the dyes. For Disperse Red 1, the saturated birefringence is enhanced by a factor of 8 due to hydrogen bonding at 30 wt % loading. Moreover, hydrogen bonding reduces the mobility of the guest molecules in the polymer host which improves the temporal stability of the induced birefringence to a level comparable to side-chain polymers.
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Arri Priimagi, Francisco J. Rodriguez, Martti Kauranen, Matti Kaivola, "Enhanced photoinduced birefringence in hydrogen-bonded guest-host polymers", Proc. SPIE 6653, Linear and Nonlinear Optics of Organic Materials VII, 665313 (13 September 2007); doi: 10.1117/12.733493; https://doi.org/10.1117/12.733493

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