论文标题
使用时间分辨的抗螺旋发光的有效电子温度测量
Effective electron temperature measurement using time-resolved anti-Stokes photoluminescence
论文作者
论文摘要
金属纳米颗粒的抗螺旋发光，其中发射光子的能量比入射光子更高，这是纳米粒子中温度普遍的指标。先前的工作表明了如何在连续波单色照明下从金纳米颗粒中提取温度。我们将技术扩展到脉冲照明，并引入泵探针抗烟素光谱。这项新技术使我们不仅能够在我们的条件下测量金纳米颗粒中的有效电子温度（$ \ sim 10^3 $ k），还可以通过脉冲激发电位对光致发光的影响，并测量具有子picosecond Time分辨率的超快动力学。我们测量了电子的加热和冷却，所有电子的加热和冷却，发现，在我们的次秒脉冲中，最高的明显温度达到$ 0.6 $ ps，然后在灭绝信号的最大变化幅度变化之前
Anti-Stokes photoluminescence of metal nanoparticles, in which emitted photons have a higher energy than the incident photons, is an indicator of the temperature prevalent within a nanoparticle. Previous work has shown how to extract the temperature from a gold nanoparticle under continuous-wave monochromatic illumination. We extend the technique to pulsed illumination and introduce pump-probe anti-Stokes spectroscopy. This new technique enables us not only to measure an effective electron temperature in a gold nanoparticle ($\sim 10^3$ K under our conditions), but also to measure ultrafast dynamics of a pulse-excited electron population, through its effect on the photoluminescence, with sub-picosecond time resolution. We measure the heating and cooling, all within picoseconds, of the electrons and find that, with our sub-picosecond pulses, the highest apparent temperature is reached $0.6$ ps before the maximum change in magnitude of the extinction signal
