Sub-wavelength Raman spectroscopy on isolated silver islands |
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| Institution: | 1. São Carlos Institute of Physics, University of São Paulo, PO Box 369, 13560-970, São Carlos, SP, Brazil;2. Dep. of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544, USA;1. School of Electronic Engineering, Xi''an University of Post & Telecommunications, Xi''an, 710121, PR China;2. School of Physics and Information Technology, Shaanxi Normal University, 710119, Xi''an, PR China;1. School of Science, China University of Petroleum (East China), Qingdao 266580, China;2. Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry, University of Science and Technology Beijing, Beijing 100083, China;3. Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China;1. Faculty of Natural Science, University of the Western Cape, Bellville, Cape Town 7535, South Africa;2. Materials Science and Manufacturing, Council for Scientific & Industrial Research (CSIR), Pretoria 0001, South Africa |
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| Abstract: | Surface Enhanced Raman Spectroscopy (SERS) is a valuable analytical tool for the investigation of molecules adsorbed on roughened noble metal surfaces. The shape, size, and surrounding of the metal protrusions play an important role in the Raman scattering enhancement. By combining scanning near-field optical microscopy (SNOM) with Raman spectroscopy the spatial resolution suffices for investigating isolated silver islands on SERS active substrates. We demonstrate an optical resolution below 70 nm for recording spectra on specifically prepared and fully characterized SERS substrates. For a quantitative evaluation of the SERS signal the spatial distribution of Rhodamine 6G (R6G) deposited on the SERS substrate was determined by friction force measurements. By comparing the Raman intensities of the SERS substrates with those of unmetallized support plates absolute SERS enhancement factors at specific locations on top and in the vicinity of the silver islands were determined directly. |
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