寿命分辨光子相关傅里叶光谱
Lifetime-resolved Photon-Correlation Fourier Spectroscopy
摘要：
单个固态发射体的激发态群体经受由浴驱动的平衡周围的能量波动和通过声子或光子的发射的弛豫。相关光谱动态的同时测量需要一种具有高光谱和时间分辨率以及额外高时间动态范围的技术。我们提出了一个脉冲激发激光模拟的光子相关傅立叶光谱（PCFS），它提取的线形和光谱扩散动态沿发射体的发射寿命轨迹，有效地区分光谱动力学的松弛和浴波动。这种寿命分辨的光子晶体光纤耦合系统在迈克耳孙干涉仪的输出臂上将光子对在激光激发和光子检测之间的时间延迟以及两个光子之间的时间延迟关联起来。我们提出的实用程序的技术与变化的相对贡献的发射从多个状态的系统，例如，量子发射器表现出声子介导的交换不同的精细结构状态之间。
英文摘要：
The excited state population of single solid-state emitters is subjected to energy fluctuations around the equilibrium driven by the bath and relaxation through the emission of phonons or photons. Simultaneous measurement of the associated spectral dynamics requires a technique with a high spectral and temporal resolution with an additionally high temporal dynamic range. We propose a pulsed excitation-laser analog of Photon-Correlation Fourier Spectroscopy (PCFS), which extracts the lineshape and spectral diffusion dynamics along the emission lifetime trajectory of the emitter, effectively discriminating spectral dynamics from relaxation and bath fluctuations. This lifetime-resolved PCFS correlates photon-pairs at the output arm of a Michelson interferometer in both their time-delay between laser-excitation and photon-detection and the time-delay between two photons. We propose the utility of the technique for systems with changing relative contributions to the emission from multiple states, for example, quantum emitters exhibiting phonon-mediated exchange between different fine-structure states.
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