Abstract
A photoassisted corona poling technique (PACP) was applied to a binary chromophore system that was composed of YLD-124 and DR1-co-PMMA to enhance the poling efficiency of an electrooptic (EO) polymer device. The DR1 chromophores as a photoaddressable host material were resonantly irradiated by a polarized pumping green laser beam at a wavelength of 532 nm which is within its molecular absorption band. This process caused the DR1 chromophore's reorientation via a cis-trans photoisomerization process. The coupled YLD-124 system's dipoles were then poled with the assistance of a static electrical field applied to the EO core layer. In this letter, we report the experimental demonstration of the photoassisted corona poling scheme in a binary chromophore system that improved Mach-Zehnder optical modulator performance by lowering its <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">π</sub> . It was shown that the device's <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">V</i> <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">π</sub> was reduced by 21%-23% compared to a regular device that was only corona poled without the green light assistance.
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