期刊
OPTICS EXPRESS
卷 18, 期 3, 页码 1959-1965出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.001959
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资金
- Singapore National Research Foundation [NRF-G-CRP2007-01]
- National Natural Science Foundation of China [10804003]
- Ministry of Science and Technology of China [2009DFA52300]
A substrate with ease for fabrication is proposed for surface enhanced Raman spectroscopy (SERS). A two-dimensional dielectric grating covered by a thin silver film enables the excitation of both localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs). The finite-difference time-domain simulation results show that the coupling between LSPs and SPPs is able to highly improve the Raman enhancement (2 x 10(9) as obtained by simulation). In addition, the near-field distribution at the top of cubic bumps along the transverse plane presents a highly regular hotspots pattern, which is required for an ideal SERS substrate. (C) 2009 Optical Society of America
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