Laboratoire de Nanotechnologie et d'Instrumentation Optique LNIO-CNRS UMR 6279, Université de Technologie de Troyes, Troyes, France.
ACS Nano. 2012 Feb 28;6(2):1299-307. doi: 10.1021/nn2040389. Epub 2012 Feb 1.
We report a near-field imaging study of colloidal gold nanocubes. This is accomplished through a photochemical imaging method in which molecular displacements are vectorial in nature, enabling sensitivity to the polarization of the optical near-field of the nanocubes. We analyze the confinement of both electromagnetic hot and "cold" spots with a resolution of λ/35 and emphasize the particularly high spatial confinement of cold spots. The concept of a cold spot complements the well-known electromagnetic hot spot but can have significant advantages. The application of the ultraconfined cold spots to high resolution imaging and spectroscopy is discussed.
我们报告了胶体金纳米立方体的近场成像研究。这是通过光化学成像方法实现的，其中分子位移具有矢量性质，使我们能够对纳米立方体的光学近场的偏振敏感。我们分析了电磁热点和“冷点”的限制，分辨率达到 λ/35，并强调了冷点的特别高的空间限制。冷点的概念补充了众所周知的电磁热点，但具有显著的优势。讨论了将超限制冷点应用于高分辨率成像和光谱学的问题。
