Polarization-dependent nonlinear refraction and two-photon absorption in GaAs/AlAs superlattice waveguides below the half-bandgap

被引：24
作者：
Wagner, Sean J.
Meier, Joachim
Helmy, A. S.
Aitchison, J. Stewart
Sorel, Marc
Hutchings, David C.
机构：
[1] Univ Toronto, Edward S Rogers Sr Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada
[2] Univ Glasgow, Dept Elect & Elect Engn, Glasgow G12 8QQ, Lanark, Scotland
来源：
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS | 2007年 / 24卷 / 07期
关键词：
D O I：
10.1364/JOSAB.24.001557
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
Values for the two-photon absorption coefficient, alpha(2), and nonlinear refractive index coefficients, n(2), are measured for a waveguide core made of 14:14 monolayer GaAs/AlAs superlattice at photon energies below the half-bandgap. Two-photon absorption coefficients show significant anisotropy with the TE mode having alpha(2) values up to four times greater than the TM mode. For nonlinear refraction, we determined values of the nonlinear index for the TE mode that are as much as two times larger than the TM mode. Measurements of cross-phase modulation between the TE and TM modes gave ratios of cross-phase modulation to self-phase modulation that were highly anisotropic. (c) 2007 Optical Society of America.
引用
收藏
页码：1557 / 1563
页数：7
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