Polarization Control with Plasmonic Antenna Tips: A Universal Approach to Optical Nanocrystallography and Vector-Field Imaging,Nano Letters

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Polarization Control with Plasmonic Antenna Tips: A Universal Approach to Optical Nanocrystallography and Vector-Field Imaging
Nano Letters ( IF 9.6 ) Pub Date : 2018-03-23 00:00:00 , DOI: 10.1021/acs.nanolett.8b00108
Kyoung-Duck Park ₁ , Markus B. Raschke ₁

Affiliation

Controlling the propagation and polarization vectors in linear and nonlinear optical spectroscopy enables us to probe the anisotropy of optical responses providing structural symmetry selective contrast in optical imaging. Here, we present a novel tilted antenna-tip approach to control the optical vector-field by breaking the axial symmetry of the nanoprobe in tip-enhanced near-field microscopy. This gives rise to a localized plasmonic antenna effect with significantly enhanced optical field vectors with control of both in-plane and out-of-plane components. We use the resulting vector-field specificity in the symmetry selective nonlinear optical response of second-harmonic generation (SHG) for a generalized approach to optical nanocrystallography and imaging. In tip-enhanced SHG imaging of monolayer MoS₂ films and single-crystalline ferroelectric YMnO₃, we reveal nanocrystallographic details of domain boundaries and domain topology with enhanced sensitivity and nanoscale spatial resolution. The approach is applicable to any anisotropic linear and nonlinear optical response and enables the optical nanocrystallographic imaging of molecular or quantum materials.

中文翻译：

等离子天线的极化控制技巧：光学纳米晶体学和矢量场成像的通用方法

控制线性和非线性光学光谱中的传播和偏振矢量，使我们能够探测光学响应的各向异性，从而在光学成像中提供结构对称的选择性对比度。在这里，我们提出了一种新颖的倾斜天线尖端方法，可通过破坏尖端增强型近场显微镜中纳米探针的轴向对称性来控制光学矢量场。这就产生了局部等离激元天线效应，其在控制平面内和平面外分量的情况下具有显着增强的光场矢量。我们将产生的矢量场特异性用于二次谐波产生（SHG）的对称选择性非线性光学响应中，以用于光学纳米晶体学和成像的通用方法。在单层MoS _2的尖端增强SHG成像中薄膜和单晶铁电YMnO ₃，我们揭示了具有增强的灵敏度和纳米级空间分辨率的畴边界和畴拓扑的纳米晶体学细节。该方法适用于任何各向异性的线性和非线性光学响应，并使分子或量子材料的光学纳米晶体成像成为可能。

更新日期：2018-03-23

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