近日，德国马克斯·普朗克光科学研究所的Hanieh Fattahi及其研究团队取得一项新进展。经过不懈努力，他们对液体的近千赫兹场镜技术研究研究。相关研究成果已于2024年10月21日在国际知名学术期刊《自然—光子学》上发表。

该研究团队展示了以200阿秒的时间分辨率和亚飞焦耳的检测灵敏度，对几飞秒脉冲进行近拍赫兹电场检测的能力。通过场分辨检测液相中受脉冲激发的分子，即飞秒场镜技术，研究人员实现了目标分子响应与环境及激发脉冲响应的时间隔离。

在对水样和液相样品的概念验证分析中，研究人员首次展示了对4.13微摩尔乙醇组合带的场敏感检测。该方法将水样分析的范围扩展到更高的检测灵敏度和动态范围，同时，相位和强度信息的同步直接测量为高分辨率生物光谱显微镜技术的发展铺平了道路。

据悉，测量瞬态光学场不仅对理解超快现象至关重要，而且对样品中各种分子组分的定量检测也极为关键。

附：英文原文

Title: Near-petahertz fieldoscopy of liquid

Author: Srivastava, Anchit, Herbst, Andreas, Bidhendi, Mahdi M., Kieker, Max, Tani, Francesco, Fattahi, Hanieh

Issue&Volume: 2024-10-21

Abstract: Measuring transient optical fields is pivotal not only for understanding ultrafast phenomena but also for the quantitative detection of various molecular species in a sample. Here we demonstrate near-petahertz electric field detection of a few femtosecond pulses with 200 attosecond temporal resolution and subfemtojoule detection sensitivity. By field-resolved detection of the impulsively excited molecules in the liquid phase, termed femtosecond fieldoscopy, we demonstrate temporal isolation of the response of the target molecules from those of the environment and the excitation pulse. In a proof-of-concept analysis of aqueous and liquid samples, we demonstrate field-sensitive detection of combination bands of 4.13μmol ethanol for the first time. This method expands the scope of aqueous sample analysis to higher detection sensitivity and dynamic range, while the simultaneous direct measurements of phase and intensity information pave the path towards high-resolution biological spectro-microscopy.

DOI: 10.1038/s41566-024-01548-2

Source: https://www.nature.com/articles/s41566-024-01548-2