A novel coupled quantum well structure with large field-induced refractive index change and low abso

• 作 者: 徐枝新 周强 江晓清 李锡华 杨建义 王明华
• 机 构: Department of Information Science & Electronic Engineering, Zhejiang University, Hangzhou 310027 Dep
• 出 处: Chinese Optics Letters
• 发表日期: 2005年09期
• 关键词: refractive exciton switching photonic confined overlap overcome utilized symmetr

A novel coupled quantum well structure — quasi-symmetric coupled quantum well (QSCQW) is proposed.In the case of low applied electric field (F = 25 kV/cm) and low absorption loss (a 100 cm-1), a largefield-induced refractive index change (for TE mode, Δn = 0.0106; for TM mode, Δn = 0.0115) is obtainedin QSCQW structure at operating wavelength λ = 1550 nm. The value is larger by over one to two orderof magnitude compared to that in a rectangular quantum well (RQW) and about 50% larger than that offive-step asymmetric coupled quantum well (FACQW) structure under the above work conditions.

A novel coupled quantum well structure - quasi-symmetric coupled quantum well (QSCQW) is proposed.In the case of low applied electric field (F = 25 kV / cm) and low absorption loss (a 100 cm- The refractive index change (for TE mode, Δn = 0.0106; for TM mode, Δn = 0.0115) was obtained in QSCQW structure at operating wavelength λ = 1550 nm. The value is larger by over one to two order of magnitude compared to that in a rectangular quantum well (RQW) and about 50% larger than that offive-step asymmetric coupled quantum well (FACQW) structure under the above work conditions.