Journal
PLASMONICS
Volume 10, Issue 4, Pages 949-954Publisher
SPRINGER
DOI: 10.1007/s11468-015-9884-7
Keywords
Surface-enhanced Raman scattering; Hyperbolic metamaterials; Roll-up nanotechnology; Microtube
Funding
- National Natural Science Foundation of China [51271057]
- Natural Science Foundation of Jiangsu Province, China [BK2012757]
- Ministry of Education of China [NCET-11-0096]
- Natural Science Foundation of China [51322201, 51475093]
- Science and Technology Commission of Shanghai Municipality [12520706300, 14JC1400200]
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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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