Room temperature continuous-wave excited biexciton emission in perovskite nanoplatelets via plasmonic nonlinear fano resonance
Room temperature continuous-wave excited biexciton emission in perovskite nanoplatelets via plasmonic nonlinear fano resonance
复制标题
通过等离子体非线性法诺共振在钙钛矿纳米片中进行室温连续波激发双激子发射
DOI：
10.1038/s42005-019-0178-9
复制
发表时间：
2019-07-12
影响因子：
5.5
通讯作者：
Liu, Xinfeng
中科院分区：
文献类型：
--
作者：
Chen, Jie;Zhang, Qing;Liu, Xinfeng
双激子是多体激子相互作用的一种表现形式，在量子态相干组合的构建中对量子信息和计算至关重要。然而，由于束缚能小、跃迁效率低，传统半导体中的双激子大多存在于低温或飞秒脉冲激光激发下。在此，我们通过耦合等离子体纳米隙，证明了cspbbr3纳米薄片在室温下具有连续波激发的强双激子发射。在银纳米线-银薄膜纳米间隙中，产生双激子所需的激子占用率降低了约106倍。双激子发射的极大增强是由双激子与表面等离子体腔模式之间的非线性法诺共振驱动的。这些结果为开发高效非闪烁双激子单光子源（双激子带光谱滤波器）、纠缠光源和基于双激子态的激光器提供了新的途径。
Biexcitons are a manifestation of many-body excitonic interactions, which are crucial for quantum information and computation in the construction of coherent combinations of quantum states. However, due to their small binding energy and low transition efficiency, most biexcitons in conventional semiconductors exist either at cryogenic temperatures or under femto-second pulse laser excitation. Herein, we demonstrated strong biexciton emissions from CsPbBr3nanoplatelets with continuous-wave excitation at room temperature by coupling them with a plasmonic nanogap. The exciton occupancy required to generate biexciton was reduced ~106times in the Ag nanowire–Ag film nanogaps. The extremely large enhancement of biexciton emissions was driven by nonlinear Fano resonance between biexcitons and surface plasmon cavity modes. These results provide new pathways to develop high efficiency non-blinking single photon sources of biexciton (with spectral filter for biexciton), entangled light sources, and lasers based on biexciton states.