Abstract
We investigate the surface-enhanced Raman spectroscopy of Ag nanorings antenna in both experiment and simulation. Self-organized Ag nanorings antenna were formed on quartz glass wafers by a simple chemistry reaction without any template. The three-dimensional finite-difference time-domain simulation calculations indicate that the electric field enhancement of Ag nanoring antenna is strongly dependent on the gap distance. A very strong surface plasmon coupling in the gap region of Ag nanoring antenna is observed, whose field intensity is enhanced four times compared to that for Ag nanodomes antenna with the same gap distance. Surface-enhanced Raman scattering (SERS) measurements have shown that the SERS intensity acquired from the Ag nanoring antenna is about 16 times stronger than that obtained from Ag nanodomes antenna. These results pave the way to design plasmonic nanostructures for practical applications that require coupled metallic nanoparticles with enhanced electric fields.
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Acknowledgments
The work is supported by the National Natural Science Foundation of China (No. 10804101; 60908023; 11375159), Science and Technology Development Foundation of Chinese Academy of Engineering Physics (No. 2010B0401055), Open Foundation of Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology and Research Center of Laser Fusion, CAEP (No. 12zxjk07), Scholarship Award for Excellent Doctoral Student granted by Ministry of Education (1343-76140000014), Hunan Provincial Innovation Foundation for Postgraduate (No. CX2012B114), and the Open-End Fund for the Valuable and Precision Instruments of Central South University (CSUZC2012032).
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Yi, Z., Li, X., Luo, J. et al. Self-Organized Ag Nanorings Antenna Substrates for Surface-Enhanced Raman Spectroscopy. Plasmonics 9, 375–379 (2014). https://doi.org/10.1007/s11468-013-9634-7
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DOI: https://doi.org/10.1007/s11468-013-9634-7