Fast Pump-Probe Microscopy Imaging with Asynchronous Optical Sampling

IF 3 2区化学 Q3 CHEMISTRY, PHYSICAL The Journal of Physical Chemistry A Pub Date : 2026-10-15 Epub Date: 2026-10-01 DOI:10.1021/acs.jpca.6c04871

Ajinkya Shingote, Naomi Ross, Janak Bhandari, Bikram Ghosh, Vadim Trepalin, Debasish Panda, Svetlana Neretina, Som Subhra Guria, Petr Stepanov, Kenji Watanabe, Takashi Taniguchi, Gregory V. Hartland

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Abstract

Asynchronous optical sampling (ASOPS) allows rapid collection of transient absorption/reflection data over wide time scales with a high dynamic range in both time and signal magnitude. In this paper, a method for recording transient images using ASOPS is presented based on time-gated integration of the transient signal. This technique allows diffraction-limited pump-probe microscopy images to be rapidly collected at precise, user-specified time delays, with approximately 15 picoseconds time resolution. Results are presented for the excited-state dynamics in multilayered WSe₂ flakes, charge-carrier diffusion in a silicon wafer, and images of Au nanoparticle arrays that demonstrate the spatial/temporal resolution and sensitivity of the technique. Potential applications and the ultimate time resolution that can be achieved are also discussed.

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快速泵探针显微镜成像与异步光学采样

异步光学采样（ASOPS）允许在宽时间尺度上快速收集瞬态吸收/反射数据，在时间和信号幅度上具有高动态范围。本文提出了一种基于时域门控积分的瞬态图像记录方法。该技术允许以精确的、用户指定的时间延迟快速收集衍射受限的泵浦探针显微镜图像，时间分辨率约为15皮秒。结果表明，多层WSe2薄片中的激发态动力学、硅晶片中的电荷载流子扩散以及Au纳米颗粒阵列的图像证明了该技术的空间/时间分辨率和灵敏度。本文还讨论了该方法的潜在应用和最终的时间分辨率。

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来源期刊

The Journal of Physical Chemistry A 化学-物理：原子、分子和化学物理

CiteScore

5.20

自引率

10.30%

发文量

922

审稿时长

1.3 months

期刊介绍： The Journal of Physical Chemistry A is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.