A Novel Coupled Quantum Well Structure with Low-Driving Voltage, Low Absorption Loss and Large Field-Induced Refractive Index Change
XU Zhi-Xin1,2, JIANG Xiao-Qing1, XU Yi-Gang1, YANG Ai-Ling1, WANG Ming-Hua1, ZHOU Qiang1, LI Xi-Hua1, YANG Jian-Yi1
1Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027
2College of Sciences, Zhejiang University of Science and Technology, Hangzhou 310023
A Novel Coupled Quantum Well Structure with Low-Driving Voltage, Low Absorption Loss and Large Field-Induced Refractive Index Change
1Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027
2College of Sciences, Zhejiang University of Science and Technology, Hangzhou 310023
Abstract： Based on a two-energy-level system, we analyse the changing ground eigenenergies of symmetric GaAs/AlxGa1-x As coupled quantum wells in the presence of an applied electric field. From the theoretical analysis for symmetric coupled quantum well, we find the advantages and disadvantages when it is applied to travelling wave modulator. Hence the conception of quasi-symmetric coupled quantum wells is put forward. Based on the demands of travelling wave modulator for quantum well materials, the configuration of quasi-symmetric coupled quantum well is further optimized. Consequently, in the case of low applied electric field (F=20kV/cm) and low absorption loss (α≤100cm-1), a large field-induced refractive change Δn (for TE mode, Δn=0.021; for TM mode, Δn=0.0121) is attained in the optimized coupled quantum well.
XU Zhi-Xin;JIANG Xiao-Qing;XU Yi-Gang;YANG Ai-Ling;WANG Ming-Hua;ZHOU Qiang;LI Xi-Hua;YANG Jian-Yi. A Novel Coupled Quantum Well Structure with Low-Driving Voltage, Low Absorption Loss and Large Field-Induced Refractive Index Change[J]. 中国物理快报, 2005, 22(4): 956-959.
XU Zhi-Xin, JIANG Xiao-Qing, XU Yi-Gang, YANG Ai-Ling, WANG Ming-Hua, ZHOU Qiang, LI Xi-Hua, YANG Jian-Yi. A Novel Coupled Quantum Well Structure with Low-Driving Voltage, Low Absorption Loss and Large Field-Induced Refractive Index Change. Chin. Phys. Lett., 2005, 22(4): 956-959.
2005, Vol. 22 
