One- and two-dimensional anisotropic diffractive gratings formed by periodic orthogonal molecular alignment in a hydrogen-bonded liquid crystalline polymer

Autor:	Akira Emoto, Sayaka Manabe, Nobuhiro Kawatsuki, Tatsutoshi Shioda, Hiroshi Ono
Rok vydání:	2009
Předmět:	Diffraction chemistry.chemical_classification Materials science business.industry Physics::Optics General Physics and Astronomy Polymer Diffraction efficiency Polarization (waves) law.invention Optical microscope chemistry law Liquid crystal Optoelectronics Anisotropy business Diffraction grating
Zdroj:	Journal of Applied Physics. 105:103514
ISSN:	1089-7550 0021-8979
Popis:	Anisotropic diffractive gratings having periodic orthogonal molecular alignments are formed by a linearly polarized ultraviolet (LPUV) exposure through a photomask in hydrogen (H)-bonding liquid crystalline polymers (H-LCPs) using a unique molecular reorientation behavior. H-bonded side-chain groups of H-LCPs play an important role in the molecular reorientation and the resultant optical anisotropy originating from an intermolecular network composition. To evaluate its potential for optical applications, one- and two-dimensional diffractive gratings were fabricated and analyzed by both polarization optical microscopy and diffraction characteristics. As a result, anisotropic gratings using H-LCP were obtained with a high diffraction efficiency that was 80% of the theoretical maximum efficiency (33.9%) of thin diffractive gratings. Results of experimental and theoretical investigation reveal that the resultant molecular direction and optical anisotropy are generated and controlled by LPUV exposure.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c5e90cf02f32e0823e6cdd46318efec0 https://doi.org/10.1063/1.3129522 Zobrazit plný text záznamu