Refractive index change in photochromic diarylethene derivatives and its application to optical switching devices

Autor:	Fumihiro Ebisawa, Mitsutoshi Hoshino, Ken Sukegawa, Takashi Yoshida
Rok vydání:	1997
Předmět:	Chemistry General Chemical Engineering General Physics and Astronomy General Chemistry Photochemistry Methacrylate Optical switch Photochromism chemistry.chemical_compound Prism coupler Diarylethene Methyl methacrylate Refractive index Visible spectrum
Zdroj:	Journal of Photochemistry and Photobiology A: Chemistry. 105:75-81
ISSN:	1010-6030
DOI:	10.1016/s1010-6030(97)00024-5
Popis:	The refractive index change of photochromic diarylethene derivatives in solid polymer was studied with a view to fabricating an optical switching device. The reaction time required for a symmetric diarylethene photochromic compound in a copolymer of fluoroethyl methacrylate and methyl methacrylate (film thickness: 10 μm) was 20–30 s when exposed to UV light (intensity: 5.3 mW cm−2 at 350 nm) to form a closed ring and about 10 s with visible light (intensity: 3.7 mW cm−2 at 500 nm) to form an open ring. The refractive index change at 1.30 μm, measured with a prism coupler, was 0.0005 per 10 wt.% of diarylethene photochromic compound. The iteration number of the photochromic reactions in the polymer film decreased in the following order: symmetric, asymmetric diarylethene and acid anhydride. We propose a new type of self-holding optical switch combining a heat stable photochromic material with silica planar lightwave circuits.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ce37192eb6951c13200ec9da64c375ef https://doi.org/10.1016/s1010-6030(97)00024-5 Zobrazit plný text záznamu Full Text from ScienceDirect