ELECTROOPTIC CHARACTERIZATION OF NONLINEAR-OPTICAL GUEST-HOST FILMS AND POLYMERS

Citation
G. Khanarian et al., ELECTROOPTIC CHARACTERIZATION OF NONLINEAR-OPTICAL GUEST-HOST FILMS AND POLYMERS, Journal of the Optical Society of America. B, Optical physics, 13(9), 1996, pp. 1927-1934
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Optics
ISSN journal
0740-3224
Volume
13
Issue
9
Year of publication
1996
Pages
1927 - 1934
Database
ISI
SICI code
0740-3224(1996)13:9<1927:ECONGF>2.0.ZU;2-6
Abstract
The Pockels coefficients r(33) of four dyes for electro-optic applicat ions are reported, including ones with stilbene, butadiene, ate, and h exatriene linkages between the charge donors and accepters, with the c harge donor being the amino group and the acceptor groups being the ni tro and dicyanovinyl groups. r(33) are reported for dyes as guest-host s in poly(methyl methacrylate) and 50/50 copolymers with methyl methac rylate. The largest r(33) is observed for the copolymer containing the amino donor, hexatriene linkage, and the dicyanovinyl acceptor group with a value of r(33) = 18 pm/V at 140 V/mu m at a wavelength lambda = 1.3 mu m. We also find evidence that the dicyanovinyl hexatriene dyes in the copolymer are interacting with one another, causing a relative decrease in the copolymer's electro-optic efficiency compared with it s value as a guest-host in poly(methyl methacrylate). The Pockels coef ficient is measured by the ellipsometric reflection technique. We deri ve approximate analytic equations to analyze the reflected intensity a nd verify the validity of these approximations when the analyzing wave length is far from the absorption of the dye. We also derive an approx imate analytic expression for the optical retardation as a function of the ratio of the off-diagonal to the diagonal components of the Pocke ls coefficients r(13)/r(33) and also the finite birefringence of the p oled film. We show that accurate knowledge of the ratio r(13)/r(33) is critical to obtaining accurate values of r(33). (C) 1996 Optical Soci ety of America.