An exciton-polariton laser based on biologically produced fluorescent protein.
An exciton-polariton laser based on biologically produced fluorescent protein.
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DOI：
10.1126/sciadv.1600666
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发表时间：
2016-08
期刊：
影响因子：
13.6
通讯作者：
Gather MC
中科院分区：
文献类型：
--
作者：
Dietrich CP;Steude A;Tropf L;Schubert M;Kronenberg NM;Ostermann K;Höfling S;Gather MC
填充了生物产生的绿色荧光蛋白的微腔在室温下显示出极化子凝聚。在适当的条件下，腔极化子形成宏观相干量子态，称为极化子凝聚态。与无机半导体中的Wannier-Mott激子相比，有机发光材料中的局域Frenkel激子之间的相互作用较弱，但与光的耦合较强，这使得最近首次在室温下实现了极化凝聚。然而，这需要超快的光泵浦，这限制了有机极化凝聚体的应用。我们展示了腔极化子在填充了生物产生的增强型绿色荧光蛋白(EGFP)的简单叠层微腔中的室温极化子凝聚。即使在高激发密度下，EGFP独特的分子结构也能防止激子湮没，从而促进了传统纳秒泵浦下的极化子凝聚。凝聚明显地表现为一个明显的阈值、相互作用引起的凝聚态蓝移、长程相干性以及在较高激发密度下存在第二个阈值，这与光子激光的开始有关。
Microcavities filled with biologically produced green fluorescent protein show polariton condensation at room temperature. Under adequate conditions, cavity polaritons form a macroscopic coherent quantum state, known as polariton condensate. Compared to Wannier-Mott excitons in inorganic semiconductors, the localized Frenkel excitons in organic emitter materials show weaker interaction with each other but stronger coupling to light, which recently enabled the first realization of a polariton condensate at room temperature. However, this required ultrafast optical pumping, which limits the applications of organic polariton condensates. We demonstrate room temperature polariton condensates of cavity polaritons in simple laminated microcavities filled with biologically produced enhanced green fluorescent protein (eGFP). The unique molecular structure of eGFP prevents exciton annihilation even at high excitation densities, thus facilitating polariton condensation under conventional nanosecond pumping. Condensation is clearly evidenced by a distinct threshold, an interaction-induced blueshift of the condensate, long-range coherence, and the presence of a second threshold at higher excitation density that is associated with the onset of photon lasing.