Room-temperature polariton lasing in an organic single-crystal microcavity
Room-temperature polariton lasing in an organic single-crystal microcavity
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DOI：
10.1038/nphoton.2010.86
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发表时间：
2010-06-01
期刊：
影响因子：
35
通讯作者：
Forrest, S. R.
中科院分区：
文献类型：
--
作者：
Kena-Cohen, S.;Forrest, S. R.
有机半导体的光学性质几乎完全是用Frenkel激子图(1)来描述的。在这个描述中，被激发的电子和它留下的带电空位（空穴）之间的强库仑相互作用被自动考虑在内。如果在光学微腔中，激子-光子相互作用比激子和光子的衰减率强，则必须引入第二个准粒子，即微腔极化子，以适当地解释这种耦合(2)。据预测，当极化子< n(gs)>的基态占比达到1时，极化子的相干激光发射就会发生（参考文献3）。这个过程，被称为极化激子激光，可以发生在阈值远低于所需的传统激光。有机半导体中的极化子在室温下是高度稳定的，但据我们所知，目前还没有从这些结构中产生非线性发射的报道。在这里，我们展示了室温下在有机微腔中的极化激子激光，该微腔是由夹在两个介电镜之间的熔融生长的蒽单晶组成的。
The optical properties of organic semiconductors are almost exclusively described using the Frenkel exciton picture(1). In this description, the strong Coulombic interaction between an excited electron and the charged vacancy it leaves behind (a hole) is automatically taken into account. If, in an optical microcavity, the exciton-photon interaction is strong compared to the excitonic and photonic decay rates, a second quasiparticle, the microcavity polariton, must be introduced to properly account for this coupling(2). Coherent, laser-like emission from polaritons has been predicted to occur when the ground-state occupancy of polaritons < n(gs)>, reaches 1 (ref. 3). This process, known as polariton lasing, can occur at thresholds much lower than required for conventional lasing. Polaritons in organic semiconductors are highly stable at room temperature, but to our knowledge, there has as yet been no report of nonlinear emission from these structures. Here, we demonstrate polariton lasing at room temperature in an organic microcavity composed of a melt-grown anthracene single crystal sandwiched between two dielectric mirrors.