Polariton condensation in an optically induced two-dimensional potential
Polariton condensation in an optically induced two-dimensional potential
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DOI：
10.1103/physrevb.88.041308
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发表时间：
2013-07-29
影响因子：
3.7
通讯作者：
Lagoudakis, P. G.
中科院分区：
文献类型：
--
作者：
Askitopoulos, A.;Ohadi, H.;Lagoudakis, P. G.
我们在实验上证明了激子极化激元的光阱凝聚。非共振泵浦分布被成形为环形并投射到高品质因子微腔，在那里它形成源自极化激元与激子库的相互作用的二维排斥光学势。在陷阱中的粒子的人口增加最终导致出现一个封闭的极化激元凝聚体，是空间解耦的退相干诱导水库，在任何建设的相干性的激发区域。在参考实验中，通过改变激发强度分布关闭捕获机制，激发密度高出两倍以上时发生极化激元凝聚，所得凝聚物经历更强的退相和耗尽过程。
We demonstrate experimentally the condensation of exciton polaritons through optical trapping. The nonresonant pump profile is shaped into a ring and projected to a high quality factor microcavity where it forms a two-dimensional repulsive optical potential originating from the interactions of polaritons with the excitonic reservoir. Increasing the population of particles in the trap eventually leads to the emergence of a confined polariton condensate that is spatially decoupled from the decoherence inducing reservoir, before any buildup of coherence on the excitation region. In a reference experiment, where the trapping mechanism is switched off by changing the excitation intensity profile, polariton condensation takes place for excitation densities more than two times higher and the resulting condensate is subject to much stronger dephasing and depletion processes.