Highly Reproducible Near-Field Optical Imaging with Sub-20-nm Resolution Based on Template-Stripped Gold Pyramids
| Autor: | Ryan Beams, Sang Hyun Oh, Sergio G. Rodrigo, Timothy W. Johnson, Nathan C. Lindquist, Lukas Novotny, Zachary J. Lapin |
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| Rok vydání: | 2012 |
| Předmět: |
Fluorescence-lifetime imaging microscopy
Fabrication Materials science General Physics and Astronomy Carbon nanotube Spectrum Analysis Raman Sensitivity and Specificity law.invention Super-resolution imaging symbols.namesake Tip-enhanced Raman scattering Optics law General Materials Science Wafer Near-field scanning optical microscopy Plasmon Template stripping business.industry Optical antenna General Engineering Reproducibility of Results Single-molecule fluorescence Single-molecule experiment Molecular Imaging Nanostructures Microscopy Fluorescence Plasmonics symbols Near-field scanning optical microscope Gold business Raman spectroscopy |
| Zdroj: | ACS Nano, 6 (10) |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | With a template-stripping fabrication technique, we demonstrate the mass fabrication of high-quality, uniform, ultrasharp (10 nm) metallic probes suitable for single-molecule fluorescence imaging, tip-enhanced Raman spectroscopy (TERS), and other near-field imaging techniques. We achieve reproducible 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°) of our pyramidal tip is well suited to scatter the near-field optical signal into the far-field, leading to larger emission enhancement and hence 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 (1.5 million identical probes over a wafer) of the probes hold promise for reliable optical sensing and detection and for cementing near-field optical imaging and spectroscopy as a routine characterization technique. ACS Nano, 6 (10) ISSN:1936-0851 ISSN:1936-086X |
| Databáze: | OpenAIRE |
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