期刊
NANO LETTERS
卷 10, 期 6, 页码 2231-2236出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl1012085
关键词
Surface-enhanced Raman scattering; nanogap; surface plasmon; atomic layer deposition; plasmonics
类别
资金
- NSF MRSEC [DMR-0819885]
- Minnesota Partnership Award for Biotechnology
- Camille Dreyfus Teacher-Scholar Fellowship
- 3M Faculty Award
- NSF through the National Nanotechnology Infrastructure Network
- 3M Science and Technology Fellowship
- University of Minnesota
Nanometric gaps in noble metals can harness surface plasmons, collective excitations of the conduction electrons, for extreme subwavelength localization of electromagnetic energy. Positioning molecules within such metallic nanogaps dramatically enhances light matter interactions, increasing absorption, emission, and, most notably, surface-enhanced Raman scattering (SERS). However, the lack of reproducible high-throughput fabrication techniques with nanometric control over the gap size has limited practical applications. Here we show sub-10-nm metallic nanogap arrays with precise control of the gap's size, position, shape, and orientation. The vertically oriented plasmonic nanogaps are formed between two metal structures by a sacrificial layer of ultrathin alumina grown using atomic layer deposition. We show increasing local SERS enhancements of up to 10(9) as the nanogap size decreases to 5 nm. Because these sub-10-nm gaps can be fabricated at high densities using conventional optical lithography over an entire wafer, these results will have significant implications for spectroscopy and nanophotonics.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据