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

KHANARIAN G SOUNIK J ALLEN D SHU SF WALTON C

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

16

INGLESE

Article

Optics

Journal of the Optical Society of America. B, Optical physics → ACNP

0740-3224

13

9

1996

1927 - 1934

ISI

0740-3224(1996)13:9<1927:ECONGF>2.0.ZU;2-6

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.