显微镜
光谱学
材料科学
红外线的
光学
红外光谱学
红外显微镜
光热治疗
傅里叶变换红外光谱
衍射
激发态
分辨率(逻辑)
分析化学(期刊)
化学
纳米技术
物理
原子物理学
色谱法
人工智能
计算机科学
有机化学
量子力学
作者
Haomin Wang,Qing Xie,Yu Zhang,Xiaoji G. Xu
标识
DOI:10.1021/acs.jpcc.1c01268
摘要
The diffraction limit binds the spatial resolution of optical spectroscopy to a finite fraction of the light wavelength. Traditional far-field pump/probe spectroscopy that detects the excited-state absorption (ESA) is not an exception. In this work, we present a new spectroscopic route to measure ESA based on the mechanical detection of the photothermal responses with the peak force infrared (PFIR) microscopy. We probe the vibrational ESA through the difference of the photothermal effects between temporal overlap and offset of two frequency-tunable infrared pulses. Two-dimensional PFIR spectra are collected on the carbonyl of a polymer with ESA responses. Also, we spatially map the ESA response of a structured polymer. The spatial resolution of the pump–probe PFIR microscopy is not bound by the diffraction limit that restraints to a finite fraction of the wavelength. Further, implementation of the detection paradigm of pump–probe microscopy will provide access to the highly desired two-dimensional infrared nanoscopy.
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