Nanoscale Optical and Mechanical Manipulation of Molecular Alignment in Metal鈥揗olecule鈥揗etal Structures

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• 作者：Katsuyoshi Ikeda ; Norihiro Fujimoto ; Kohei Uosaki
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：September 18, 2014
• 年：2014
• 卷：118
• 期：37
• 页码：21550-21557
• 全文大小：468K
• ISSN：1932-7455

文摘

Equilibrium molecular orientations, monitored using surface enhanced Raman scattering, are controlled by both optical and mechanical means in metal鈥搈olecule鈥搈etal nanogap structures, formed on an atomically planar Au(111) surface. The spatially confined optical near-fields exert a torque on the molecules in the nanogaps and align the molecular orientations along the field vector. The mechanical compression from the metal nanogaps not only disturbs the molecular alignments but also perturbs the electronic structures at metal鈥搈olecule interfaces. The implications of such interactions are discussed with respect to control and detection of local electronic properties in molecular nanodevices.