Modulating emission polarization of semiconductor quantum dots through surface plasmon of metal nanorod

被引：37

作者：

Cheng, Mu-Tian ^{[1
,2
]}

Liu, Shao-Ding ^{[1
,2
]}

Wang, Qu-Quan ^{[1
,2
]}

机构：

[1] Wuhan Univ, Dept Phys, Wuhan 430072, Peoples R China

[2] Wuhan Univ, Key Lab Acoust & Photon Mat & Devices, Minist Educ, Wuhan 430072, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 16期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1063/1.2916826

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We theoretically investigated the dynamics of exciton populations [rho(yy)(t) and rho(xx)(t)] on two orthogonal polarization eigenstates (|x > and |y >) and the polarization ratio P(t)=[rho(yy)(t)-rho(xx)(t)]/[rho(yy)(t)+rho(xx)(t)] of an anisotropic InGaAs quantum dot modulated by the surface plasmon of an Au nanorod (NR). In the resonance of longitudinal surface plasmon of AuNR, the polarization ratio P(t) increases from 0.22 to 0.99 during the excitation due to the efficient enhancement of Rabi frequency of the transition between the |y > and vacuum states, and decreases from 0.02 to -0.92 after the excitation pulse due to the enhancement of decay rate of the |y > state. This offers an approach to modulate the dynamic polarization ratio of radiative emissions. (C) 2008 American Institute of Physics.

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页数：3

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