2D13 高分子アゾベンゼン液晶のグレーティング形成における回折効率の増幅挙動

概要

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This study describes the enhanccment of diffraction efficiency in the formation of graings by means of polymer liquid crystals (PLCs) containing a photochromic and a mesogenic unit. On irradiation of writing beams (488 nm) in an N phase, the intensity of the diffraction beam increased immediately and decreased within 500 ms. When the writing beams were turned off, the diffraction efficiency was rapidly enhanced over 5 times (about 20 %), Furthermore, the grating was stable below glass transition temperature (Tg). We evaluated the film surface to investigate the mechanism of these phenomena by scanning probe microscopy (SPM). It was revealed that a slight surface relief grating (SRG) (15-20 nm) was formed. This fact clearly indicates that the SRG makes a small contribution to the refractive-index modulation. It is speculated that the enhancement of the diffraction efficiency would be attributable to the refractive-index change based on the alignment change of mesogens.
日本液晶学会の論文
2001-09-24