Optical control of the emission direction of a quantum dot
Optical control of the emission direction of a quantum dot
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DOI：
10.1063/1.4845975
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发表时间：
2013-12-09
影响因子：
4
通讯作者：
Skolnick, M. S.
中科院分区：
文献类型：
--
作者：
Luxmoore, I. J.;Wasley, N. A.;Skolnick, M. S.
利用非共振激发激光的螺旋度，实现了对InAs/GaAs量子点发射方向的控制.量子点在交叉波导结构中偏离中心定位，使得相反圆偏振的光子发射到相反波导方向中。通过优先激发自旋极化激子，因此可以控制发射的方向。通过使用耦合到两个波导中的光的强度的比率来量化方向控制，该比率达到最大值+/-35%。(C)2013 AIP Publishing LLC.
Using the helicity of a non-resonant excitation laser, control over the emission direction of an Inas/GaAs quantum dot is demonstrated. The quantum dot is located off-center in a crossed-waveguide structure, such that photons of opposite circular polarization are emitted into opposite waveguide directions. By preferentially exciting spina polarized excitons, the direction of emission can therefore be controlled. The directional control is quantified by using the ratio of the intensity of the light coupled into the two waveguides, which reaches a maximum of +/- 35%. (C) 2013 AIP Publishing LLC.