Chen Qiying, Sargent Edward H, Leclerc Nicolas, Attias André-Jean
Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.
Appl Opt. 2003 Dec 20;42(36):7235-41. doi: 10.1364/ao.42.007235.
The wavelength dependence and figures of merit of the third-order optical nonlinearity of a conjugated 3,3'-bipyridine derivative, a designed nondipolar structure of the donor-acceptor-acceptor-donor type, are reported. Z scans reveal positive nonlinear refractive-index changes for wavelengths longer than the one-photon absorption wavelength. Although the value of nonlinear Kerr coefficient n2 decreases from 6.0(+/- 0.2) x 10(-6) cm2/GW at 750 nm to 4.6(+/- 0.7) x 10(-6) cm2/GW at 1550 nm, the value of nonlinear absorption beta decreases from 0.084 cm/GW at 750 nm to a negligible value at 1550 nm, giving rise to excellent nonlinearity-to-loss figures of merit at telecommunications wavelengths.
报道了一种共轭3,3'-联吡啶衍生物（一种设计的供体-受体-受体-供体型非偶极结构）的三阶光学非线性的波长依赖性和品质因数。Z扫描显示，对于波长大于单光子吸收波长的情况，非线性折射率发生正变化。尽管非线性克尔系数n2的值从750nm处的6.0(±0.2)×10^(-6) cm2/GW降至1550nm处的4.6(±0.7)×10^(-6) cm2/GW，但非线性吸收系数β从750nm处的0.084 cm/GW降至1550nm处的可忽略不计的值，从而在电信波长下产生了优异的非线性与损耗品质因数。
