Nanoscale probing of image-dipole interactions in a metallic nanostructure.
Nanoscale probing of image-dipole interactions in a metallic nanostructure.
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DOI：
10.1038/ncomms7558
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发表时间：
2015-03-19
影响因子：
16.6
通讯作者：
Waks, Edo
中科院分区：
文献类型：
--
作者：
Ropp, Chad;Cummins, Zachary;Nah, Sanghee;Fourkas, John T.;Shapiro, Benjamin;Waks, Edo
表面附近的发射体诱导图像偶极子，其可以修改所观察到的发射强度和辐射图案。在单发射器跟踪和超分辨成像应用中，通常不考虑这些图像偶极子效应。在这里，我们表明，一个发射体和它的图像偶极子之间的干扰诱导一个强的极化各向异性和所观察到的发射模式的大的空间位移。我们证明了这些影响，通过跟踪发射的一个单一的量子点沿着两个正交的偏振，因为它是确定性地定位在附近的银纳米线。两个正交偏振的衍射点可以位移高达50 nm，这是由于量子点和其诱导的图像偶极子之间的杨氏干涉效应引起的。我们表明，所观察到的空间变化的干涉条纹提供了一个有用的措施，用于校正图像偶极子引起的失真。这些结果为近场成像应用中探测和校正像偶极效应提供了一条途径。 表面附近的发射体诱导图像偶极子，其改变发射图案并在单粒子成像应用中产生误差。在这里，Ropp等人表明，图像偶极子可以扭曲的极化和测量的位置的一个发射器，这些失真可以被纠正。
An emitter near a surface induces an image dipole that can modify the observed emission intensity and radiation pattern. These image-dipole effects are generally not taken into account in single-emitter tracking and super-resolved imaging applications. Here we show that the interference between an emitter and its image dipole induces a strong polarization anisotropy and a large spatial displacement of the observed emission pattern. We demonstrate these effects by tracking the emission of a single quantum dot along two orthogonal polarizations as it is deterministically positioned near a silver nanowire. The two orthogonally polarized diffraction spots can be displaced by up to 50 nm, which arises from a Young’s interference effect between the quantum dot and its induced image dipole. We show that the observed spatially varying interference fringe provides a useful measure for correcting image-dipole-induced distortions. These results provide a pathway towards probing and correcting image-dipole effects in near-field imaging applications. An emitter near a surface induces an image dipole that alters the emission pattern and creates errors in single-particle imaging applications. Here, Ropp et al. show that an image dipole can distort the polarization and measured position of an emitter, and that these distortions can be corrected.
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