期刊
NANO LETTERS
卷 15, 期 5, 页码 3217-3223出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00405
关键词
Super-resolution; single molecule localization; plasmons; nanostructures; surface-enhanced
类别
资金
- EPSRC [EP/G060649/1, EP/H028757/1-2, EP/I012060/1, EP/L015889/1]
- MRC [MR/K015850/1]
- ERC [LINASS 320503]
- Engineering and Physical Sciences Research Council [EP/L027151/1, EP/K028510/1, EP/G060649/1, EP/H028757/1, EP/H028757/2] Funding Source: researchfish
- Medical Research Council [MR/K015850/1] Funding Source: researchfish
- EPSRC [EP/G060649/1, EP/H028757/1, EP/H028757/2, EP/L027151/1, EP/K028510/1] Funding Source: UKRI
- MRC [MR/K015850/1] Funding Source: UKRI
Coupling of light to the free electrons at metallic surfaces allows the confinement of electric fields to subwavelength dimensions, far below the optical diffraction limit. While this is routinely used to manipulate light at the nanoscale,(1) in electro-optic devices(2) and enhanced spectroscopic techniques,(3-6) no characterization technique for imaging the underlying nanoscopic electromagnetic fields exists, which does not perturb the field(4,7) or employ complex electron beam imaging.(8,9) Here, we demonstrate the direct visualization of electromagnetic fields on patterned metallic substrates at nanometer resolution, exploiting a strong autonomous fluorescence-blinking behavior of single molecules within the confined fields allowing their localization. Use of DNA-constructs for precise positioning of fluorescence dyes on the surface induces this distance-dependent autonomous blinking thus completely obviating the need for exogenous agents or switching methods. Mapping such electromagnetic field distributions at nanometer resolution aids the rational design of nanometals far diverse photonic applications.
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