Gold-coated AFM tips for tip-enhanced Raman spectroscopy: theoretical calculation and experimental demonstration | Zendy

Lingyan Meng | Zendy; Teng-Xiang Huang | Zendy; Xiang Wang | Zendy; Shu Chen | Zendy; Zhilin Yang | Zendy; Bin Ren | Zendy

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Gold-coated AFM tips for tip-enhanced Raman spectroscopy: theoretical calculation and experimental demonstration

Author(s) -

Lingyan Meng,

Teng-Xiang Huang,

Xiang Wang,

Shu Chen,

Zhilin Yang,

Bin Ren

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.013804

Subject(s) - materials science , raman spectroscopy , substrate (aquarium) , optics , atomic force microscopy , excitation , image resolution , laser , spectroscopy , optoelectronics , nanotechnology , oceanography , physics , electrical engineering , engineering , quantum mechanics , geology

The optimal gold-coated atomic force microscopy (AFM) tip-substrate 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.

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