| Original Articles |
|
|
|
|
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 |
|
| Cite this article: |
|
XU Zhi-Xin, JIANG Xiao-Qing, XU Yi-Gang et al 2005 Chin. Phys. Lett. 22 956-959 |
|
|
|
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.
|
| Keywords:
78.20.Jq
73.21.Fg
78.20.Ci
|
|
|
Published: 01 April 2005
|
|
| PACS: |
78.20.Jq
|
(Electro-optical effects)
|
| |
73.21.Fg
|
(Quantum wells)
|
| |
78.20.Ci
|
(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
