期刊
OPTICS EXPRESS
卷 23, 期 11, 页码 13804-13813出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.013804
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资金
- National Instrumentation Program [2011YQ03012406]
- NSF of China [21173171, 11474239, 21321062]
- Ministry of Education of China [IRT13036]
The optimal gold-coated atomic force microscopy (AFM) tipsubstrate system for tip-enhanced Raman spectroscopy (TERS) was designed theoretically and demonstrated experimentally. By optimizing the tip, excitation laser, and the substrate, the TERS enhancement factor can be tuned to as high as 9 orders of magnitude, and the spatial resolution could be down to 5 nm. Preliminary experimental results for AFM tips coated with gold layer of different thicknesses reveal that the maximum enhancement can be achieved when the thickness is about 60-80 nm, which is in good agreement with the theoretical prediction. Our results not only provide a deep understanding of the underlying physical mechanism of AFM tip-based TERS, but also guide the rational construction of a working AFM-TERS system with a high efficiency. (C) 2015 Optical Society of America
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