A tunable bistable device based on a coupled quantumdot–metallic nanoparticle nanosystem
A tunable bistable device based on a coupled quantumdot–metallic nanoparticle nanosystem
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基于耦合量子点-金属纳米颗粒纳米系统的可调谐双稳态器件
DOI：
10.1007/s00340-015-6119-8
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Xiao‑Fang Peng
中科院分区：
文献类型：
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作者：
Jian-Bo Li（李建波）;Shan Liang;Meng‑Dong He;Li‑Qun Chen;Xin‑Jun Wang;Xiao‑Fang Peng
本文从理论上提出了一种基于耦合半导体量子点-金属纳米粒子纳米系统的可调谐半导体器件的方案，该器件在不同频率的强抽运激光和弱探测激光的共同作用下实现。结果表明，在这种系统中，通过改变泵浦光的偏振方向，可以很容易地实现光双稳效应的开启和关闭，双稳阈值对泵浦光的强度、频率、偏振方向和粒子间距都很敏感.此外，在两个稳定状态下的非线性吸收呈现出高达10^4的比率。这意味着我们的纳米系统也可以用作光学存储单元。
We theoretically propose a scheme of a tunable .bistable device based on a coupled semiconductor quan-tum dot–metal nanoparticle nanosystem in the simultane -ous presence of a strong pump laser and a weak probe laser .with different frequencies. The results show that it is easy .to turn on or off the optical bistable effect in such system .by switching the polarization direction of the pump ield, .and the bistability thresholds are highly sensitive to the .intensity, frequency, polarization direction of the pump .ield, and the interparticle distance. In addition, the non-linear absorption in the two stable states exhibits a ratio .as high as 10^4. arising from the three-photon effect, which .implies that our nanosystem can also be used as an optical .memory cell.