Enhancement effect of Au claddings in tip enhanced Raman spectroscopy

Journal article (2019)

Authors

Y. Zhang Shenzhen University, ImPhys/Optics - AS
Liwei Cao Shenzhen University
Houkai Chen Shenzhen University
Yanmeng Dai Shenzhen University
Z. Man ImPhys/Optics - AS , Shandong University of Technology
Guangqiang Li Shenzhen University
Changjun Min Shenzhen University
Paul Urbach ImPhys/Optics - AS
Xiaocong Yuan Shenzhen University
Research Group
ImPhys/Optics (AS) (TU Delft)
Atomic force microscopy Enhancement factor Metal cladding Tip enhanced Raman spectroscopy
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Published Date

2019

Language

English

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Faculty

Applied Sciences

Department

ImPhys/Imaging Physics

Research Group

ImPhys/Optics

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.