Visualizing electromagnetic fields at the nanoscale by single molecule localization.
Visualizing electromagnetic fields at the nanoscale by single molecule localization.
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DOI：
10.1021/acs.nanolett.5b00405
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发表时间：
2015-05
期刊：
影响因子：
10.8
通讯作者：
C. Steuwe;M. Erdélyi;Gábor Szekeres;M. Csete;J. Baumberg;S. Mahajan;C. Kaminski
中科院分区：
文献类型：
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作者：
C. Steuwe;M. Erdélyi;Gábor Szekeres;M. Csete;J. Baumberg;S. Mahajan;C. Kaminski
光与金属表面的自由电子的耦合允许将电场限制在远低于光学衍射极限的亚波长尺寸。虽然这通常用于在电光器件和增强的光谱技术中操纵纳米级的光，但不存在用于对下面的纳米级电磁场进行成像的表征技术，其不干扰场或采用复杂的电子束成像。在这里，我们展示了直接可视化的图案化的金属基板上的电磁场在纳米分辨率，利用一个强大的“自主”的荧光闪烁行为的单分子内的封闭的领域，允许他们的本地化。使用DNA构建体将荧光染料精确定位在表面上诱导这种距离依赖性自主闪烁，从而完全避免了对外源性试剂或切换方法的需要。以纳米分辨率绘制这样的电磁场分布有助于合理设计用于各种光子应用的纳米金属。
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, in electro-optic devices and enhanced spectroscopic techniques, no characterization technique for imaging the underlying nanoscopic electromagnetic fields exists, which does not perturb the field or employ complex electron beam imaging. 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 for diverse photonic applications.