Enhancement effect of Au claddings in tip enhanced Raman spectroscopy
Yuquan Zhang (TU Delft - ImPhys/Optics, Shenzhen University)
Liwei Cao (Shenzhen University)
Houkai Chen (Shenzhen University)
Yanmeng Dai (Shenzhen University)
Zhongsheng Man (Shandong University of Technology, TU Delft - ImPhys/Optics)
Guang Li (Shenzhen University)
Changjun Min (Shenzhen University)
H. P. Urbach (TU Delft - ImPhys/Optics)
Xiaocong Yuan (Shenzhen University)
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Abstract
The tip-enhanced Raman spectroscopy (TERS) provides a non-destructive and label-free molecular detection approach with high sensitivity due to the hotspot excited at tip apex, which depends crucially on the tip parameters. Here, we employed an Au cladded atomic force microscopy probe to investigate enhancement effect of the Au claddings, both in theories and experiments. The simulation optimized a highest enhancement with Au cladding thickness of 50 nm under given experimental condition, being consistent with the experimental results. It provides a practical guide to optimize the probes to improve the TERS sensitivity and exert potentials in further TERS applications.
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