通讯：单分子非线性光学振动光谱的原子力检测
Communication: atomic force detection of single-molecule nonlinear optical vibrational spectroscopy.
作者信息
Saurabh Prasoon, Mukamel Shaul
机构信息
Department of Chemistry, University of California, Irvine, California 92697, USA.
出版信息
J Chem Phys. 2014 Apr 28;140(16):161107. doi: 10.1063/1.4873578.
Abstract
Atomic Force Microscopy (AFM) allows for a highly sensitive detection of spectroscopic signals. This has been first demonstrated for NMR of a single molecule and recently extended to stimulated Raman in the optical regime. We theoretically investigate the use of optical forces to detect time and frequency domain nonlinear optical signals. We show that, with proper phase matching, the AFM-detected signals closely resemble coherent heterodyne-detected signals. Applications are made to AFM-detected and heterodyne-detected vibrational resonances in Coherent Anti-Stokes Raman Spectroscopy (χ((3))) and sum or difference frequency generation (χ((2))).
摘要
原子力显微镜（AFM）能够高度灵敏地检测光谱信号。这首先在单分子核磁共振中得到证实，最近已扩展到光学领域的受激拉曼光谱。我们从理论上研究了利用光力来检测时域和频域的非线性光学信号。我们表明，在适当的相位匹配条件下，AFM检测到的信号与相干外差检测到的信号非常相似。我们将其应用于相干反斯托克斯拉曼光谱（χ((3))）以及和频或差频产生（χ((2))）中AFM检测和外差检测的振动共振。
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