期刊
OPTICS EXPRESS
卷 19, 期 5, 页码 3925-3936出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.19.003925
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资金
- Defense Advanced Research Projects Agency (DARPA)
We propose and demonstrate a new SERS substrate architecture that couples a dense three-dimensional (3-D) cavity nanoantenna array, through nano-gaps, with dense plasmonic nanodots; and a new nanofabrication that combines nanoimprint, guided self-assembly and self-alignment and has fabricated the architecture precisely, simply, inexpensively and over large area (4-inch wafer). We experimentally achieved not only high area-average SERS enhancement (1.2 x 10(9)) but also excellent uniformity (22.4% variation) at the same time over the entire large-area sample by measuring 90 points with a regular mapping distance. The best uniformity achieved is 15% variation over 1.6 mm by 1.6 mm area at slightly lower enhancement factor and is independent of the excitation laser probe size, which had an area varying from similar to 1 to 10,000 mu m(2). (C) 2011 Optical Society of America
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