Abstract
A convenient technique is reported to fabricate Ag-SiOx hyperbolic metamaterials (HMMs) as robust surface-enhanced Raman scattering (SERS) substrates based on roll-up nanotechnology. As an illustration, dramatic enhancement is achieved using Rhodamine 6G as a molecular probe, which indicates that a larger plasmonic density of states exist, leading to a greatly enhanced local electromagnetic (EM) field when the sample is irradiated with a laser beam. Optimized results are obtained by controlling the thickness of alumina coating onto Ag-SiOx HMMs using atomic layer deposition. Finite-difference time-domain simulations further illustrate the excitation of localized surface plasmon modes by calculating the EM field properties on the surface of Ag-SiOx HMMs. This efficient method of producing Ag-SiOx HMMs with highly SERS-active properties could spur expanding applications in metamaterials and bioanalysis.
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See supplemental material for SERS enhancement factor calculation
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Acknowledgments
T.Q. acknowledges support from the National Natural Science Foundation of China under Grant No. 51271057, the Natural Science Foundation of Jiangsu Province, China, under Grant no. BK2012757 and the Program for New Century Excellent Talents in University of Ministry of Education of China under Grant no. NCET-11-0096. Y.F.M. and G.S.H. thank the support from the Natural Science Foundation of China (nos. 51322201 and 51475093) and Science and Technology Commission of Shanghai Municipality (nos. 12520706300 and 14JC1400200).
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Yan Zhang and Di Han contributed equally.
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Zhang, Y., Han, D., Du, D. et al. Rolled-Up Ag-SiOx Hyperbolic Metamaterials for Surface-Enhanced Raman Scattering. Plasmonics 10, 949–954 (2015). https://doi.org/10.1007/s11468-015-9884-7
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DOI: https://doi.org/10.1007/s11468-015-9884-7