Preparation of novel optical-grade metanitroaniline and polymethylmethacrylate-coated single crystals and their optical properties

摘要

Preparation and optical properties of metanitroaniline (m-NA) and polymethylmethacrylate (PMMA)-coated m-NA single crystals were investigated. In this report, we developed relatively large-sized m-NA single crystals in methyl ethyl ketone (MEK) using solution growth techniques. The average size of the single crystals achieved is about 10x5x5 mm. The developed crystals were further coated with laboratory-developed optical-grade PMMA to study the effect of polymer coating on the second harmonic generation (SHG) properties of the single crystals. m-NA single crystals were characterized using DSC, FTIR and XRD measurement techniques. Optical characterization was done using UV-visible spectroscopy. Morphology was studied using scanning electron microscopy (SEM). Improved nonlinear optical (NLO) properties corresponding to SHG intensity values were also recorded for these coated and uncoated single crystals. PMMA-coated m-NA single crystal surfaces showed high SHG values.