arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.07193physics.ins-detphysics.optics
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用于可见光和近红外光局部激发和检测的全自动双针尖扫描近场光学显微镜

A fully automated dual-tip scanning near-field optical microscope for localized optical excitation and detection in the visible and near-infrared

Najmeh Abbasirad, Jonas Berzins, Kenneth Kollin, Sina Saravi, Norik Janunts, Frank Setzpfandt, Thomas Pertsch

摘要:

近场光学显微镜与两个独立的提示,同时激发和检测可以是必不可少的工具,研究本地化的光学现象的亚波长尺度。在这里,我们报告一个完全自动化和强大的双尖端扫描近场光学显微镜(SNOM),其中激发尖端是固定的,而检测尖端自动扫描周围区域的实施。为了监测和控制两个探针之间的距离,使用由于剪切力引起的机械相互作用。我们通过实验研究了合适的扫描参数,发现自动化双针尖SNOM可以在很宽的参数范围内稳定工作。为了证明自动双尖端SNOM的潜力,我们表征了可见光和近红外波长的金膜上的表面等离子体激元的传播。测量结果与数值模拟结果的良好一致性验证了双尖端SNOM用于近场局部光学现象表征的能力。

英文摘要:

Near-field optical microscopes with two independent tips for simultaneous excitation and detection can be essential tools for studying localized optical phenomena on the subwavelength scale. Here, we report on the implementation of a fully automated and robust dual-tip scanning near-field optical microscope (SNOM), in which the excitation tip is stationary, while the detection tip automatically scans the surrounding area. To monitor and control the distance between the two probes, mechanical interactions due to shear forces are used. We experimentally investigate suitable scan parameters and find that the automated dual-tip SNOM can operate stably for a wide range of parameters. To demonstrate the potential of the automated dual-tip SNOM, we characterize the propagation of surface plasmon polaritons on a gold film for visible and near-infrared wavelengths. The good agreement of the measurements with numerical simulations verifies the capability of the dual-tip SNOM for the near-field characterization of localized optical phenomena.

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