Temporal monitoring of nonresonant feeding of semiconductor nanocavity modes by quantum dot multiexciton transitions
Temporal monitoring of nonresonant feeding of semiconductor nanocavity modes by quantum dot multiexciton transitions
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DOI：
10.1103/physrevb.81.241302
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发表时间：
2010-06-02
影响因子：
3.7
通讯作者：
Finley, J. J.
中科院分区：
文献类型：
--
作者：
Laucht, A.;Kaniber, M.;Finley, J. J.
实验研究了量子点多激子跃迁对二维光子晶体纳米腔光模的非共振（Δ E > 5 meV）馈入。功率依赖的光致发光测量揭示了超线性的模式发射的功率依赖性，表明发射源于多激子。通过监测的光致发光光谱的时间演变，我们观察到一个明确的模式和单激子发射的关系，模式发射猝灭的人口在系统中朝着单激子水平减少，而模式发射的强度跟踪多激子跃迁。我们的结果有力地支持了最近提出的一个机制[M. Winger等人，物理修订信函103，207403（2009）]介导光子进入腔模式的强非共振馈送。
We experimentally investigate the nonresonant (Delta E > 5 meV) feeding of photons into the optical mode of a two-dimensional photonic crystal nanocavity by quantum dot multiexciton transitions. Power-dependent photoluminescence measurements reveal a superlinear power dependence of the mode emission, indicating that the emission stems from multiexcitons. By monitoring the temporal evolution of the photoluminescence spectrum, we observe a clear anticorrelation of the mode and single exciton emission; the mode emission quenches as the population in the system reduces toward the single exciton level while the intensity of the mode emission tracks the multiexciton transitions. Our results lend strong support to a recently proposed mechanism [M. Winger et al., Phys. Rev. Lett. 103, 207403 (2009)] mediating the strongly nonresonant feeding of photons into the cavity mode.