Raman Scattering Enhancement Characteristic of Concave Tip
BO Tao1,HU Jia-cheng1,CAI Jin-hui1,LI Dong-sheng1,GAO Si-tian2
1. College of Metrology & Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
Abstract：The FDTD Solutions software which is based on the finite-difference time-domain method was used to establish a simulation model of the Ag-coated concave W tip and glass substrate. In the same conditions, within the Au-coated concave W tip-glass substrates, inner concave W tip-glass substrate models of near-field electric field numerical calculation, the design verified the effectiveness of the model in terms of enhanced Raman scattering. The results show that the structure can produce the largest Raman enhancement factor of the order of 105 in the case of an Ag-coated recessed W tip-glass substrate. The tip preparation device of the National Institute of Metrology of China was used to prepare the actual tip with optimized parameters, and the TERS measurement device in the laboratory was used to measure the TERS signal of SWCNTs, experiment rusults verify the effectiveness of the designed tip in Raman signal measurement.
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2020, Vol. 41 
