Tip-Enhanced Thermal Expansion Force for Nanoscale Chemical Imaging and Spectroscopy in Photoinduced Force Microscopy
Tip-Enhanced Thermal Expansion Force for Nanoscale Chemical Imaging and Spectroscopy in Photoinduced Force Microscopy
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DOI：
10.1021/acs.analchem.8b02871
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发表时间：
2018-09-18
影响因子：
7.4
通讯作者：
Lee, Eun Seong
中科院分区：
文献类型：
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作者：
Jahng, Junghoon;Potma, Eric O.;Lee, Eun Seong
我们研究了针尖-样品连接处的纳米化学成像和光谱学中针尖增强的热膨胀力。从理论和实验上发现，样品膨胀后的针尖近场增强吸收随样品厚度和入射激光脉冲宽度的变化具有特征性。货车德瓦耳斯相互作用在从热膨胀的样品对尖端施加力方面起主要作用。的光诱导力显微镜（PiFM）的力的行为进行了比较与现有的光热诱导共振技术（PTIR），以解开模糊的热膨胀力的机制。目前的研究开辟了新的机会，以提高性能的光学纳米显微镜和光谱学，如化学成像的纳米生物材料和局部场映射的光子器件，包括表面极化激元上的货车德瓦耳斯材料的辅助下的热膨胀的功能化尖端。
We investigate the tip-enhanced thermal expansion force for nanoscale chemical imaging and spectroscopy in the tip-sample junction. It is found, both theoretically and experimentally, that the tip-enhanced absorption of the near-field at the tip followed by sample expansion shows characteristic behaviors with respect to the sample thickness and the incident laser pulse width. The van der Waals interaction plays a major role in exerting a force on the tip from the thermally expanded sample. The force behavior of the photoinduced force microscope (PiFM) is compared with that of the existing photothermal-induced resonance technique (PTIR) to unravel the ambiguous thermal expansion force mechanism. The present study opens up new opportunities for enhancing the performance of optical nanoscopy and spectroscopy such as chemical imaging of nanobiomaterials and the local field mapping of photonic devices, including surface polaritons on van der Waals materials with the assistance of the thermal expansion of a functionalized tip.