Surface-enhanced Raman spectroscopy on coupled two-layer nanorings

Yumin Hou; Jun Xu; Pengwei Wang; Dapeng Yu
May 2010
Applied Physics Letters;5/17/2010, Vol. 96 Issue 20, p203107
Academic Journal
A reproducible quasi-three-dimensional structure, composed of top and bottom concentric nanorings with same periodicity but different widths and no overlapping at the perpendicular direction, is built up by a separation-layer method, which results in huge enhancement of surface-enhanced Raman spectroscopy (SERS) due to the coupling of plasmons. Simulations show plasmonic focusing with “hot arcs” of electromagnetic enhancement meeting the need of quantitative SERS with extremely high sensitivities. In addition, the separation-layer method opens a simple and effective way to adjust the coupling of plasmons among nanostructures which is essential for the fabrication of SERS-based sensors.


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