Highly Reproducible Near-Field Optical Imaging with Sub-20-nm Resolution Based on Template-Stripped Gold Pyramids

被引:128
作者
Johnson, Timothy W. [2 ]
Lapin, Zachary J. [1 ,3 ]
Beams, Ryan [3 ]
Lindquist, Nathan C. [2 ]
Rodrigo, Sergio G. [3 ]
Novotny, Lukas [1 ,3 ]
Oh, Sang-Hyun [2 ]
机构
[1] ETH, Photon Lab, CH-8093 Zurich, Switzerland
[2] Univ Minnesota, Dept Elect & Comp Engn, Minneapolis, MN 55455 USA
[3] Univ Rochester, Inst Opt, Rochester, NY 14627 USA
基金
美国国家科学基金会; 新加坡国家研究基金会;
关键词
near-field scanning optical microscopy; plasmonics; template stripping; tip-enhanced Raman scattering; single-molecule fluorescence; super-resolution imaging; optical antenna; ENERGY-TRANSFER; METAL TIPS; MICROSCOPY; FLUORESCENCE; SPECTROSCOPY; PROBES; MODES;
D O I
10.1021/nn303496g
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
With a template-stripping fabrication technique, we demonstrate the mass fabrication of high-quality, uniform, ulhasharp (10 nm) metallic probes suitable for single-molecule fluorescence imaging, tipenhanced Raman spectroscopy (TERS), and other near-field imaging techniques. We achieve reprodudble single-molecule imaging with sub-20-nm spatial resolution and an enhancement in the detected fluorescence signal of up to 200. Similar results are obtained for TERS imaging of carbon nanotubes. We show that the large apex angle (70.5 degrees) of our pyramidal tip is well suited to scatter the near-field optical signal into the far-field, leading to larger emission enhancement and hen:e to a larger quantum yield. Each gold or silver pyramidal probe is used on-demand, one at a time, and the unused tips can be stored for extended times without degradation or contamination. The high yield (> 95%), reproducibility, durability, and massively parallel fabrication (15 million identical probes over a wafer) of the probes hold promise for reliable optical sensing and detection and for cement nj nearfield optical imaging and spectroscopy as a routine characterization technique.
引用
收藏
页码:9168 / 9174
页数:7
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