Direct laser writing of symmetry-broken nanocorrals and their applications in SERS spectroscopy
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We propose a simple and fast approach to prepare surface-enhanced Raman scattering (SERS) substrates over a large area with high flexibility by using direct laser writing (DLW) technique. The proposal is demonstrated by the direct fabrication of an array and a complex of symmetry-broken nanocorrals with DLW followed by a metal deposition process. SERS measurements show significant SERS enhancement, which can be controlled through engineering the focused “hot spots” by changing the structural parameters. The experimental observations are further confirmed by our simulations with a finite-difference time-domain tool. The studies can be extended to versatile SERS substrates with arbitrary geometries.
KeywordsSERS Focal Spot SERS Spectrum SERS Signal SERS Substrate
This work is supported by the 973 Program of China (Grant Nos. 2009CB930502, 2013CB632704 and 2013CB922404), the National Natural Science Foundation of China (Grant Nos. 91123004, 11104334, 11104342, 50825206, 10834012, and 60801043), the Outstanding Technical Talent Program of the Chinese Academy of Sciences and the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KJCX2-EW-W02).
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