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arXiv 1005.5567physics.optics
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红外光学天线电场、磁场和电流分布的测定:纳米光学矢量网络分析仪

Determination of electric field, magnetic field, and electric current distributions of infrared optical antennas: A nano-optical vector network analyzer

Robert L. Olmon, Matthias Rang, Peter M. Krenz, Brian A. Lail, Laxmikant V. Saraf, Glenn D. Boreman, Markus B. Raschke

摘要:

除了电场E(r)之外,相关的磁场H(r)和电流密度J(r)表征任何电磁设备,从而提供对天线耦合和互阻抗的洞察。我们演示了在干涉零差散射型扫描近场光学显微镜(s-SNOM)中实现的用于获得E(r)、H(r)和J(r)的射频矢量网络分析仪的光学模拟。该方法是普遍适用的,并证明了在中红外线的线性耦合偶极天线的情况下。具有纳米空间分辨率和全相位和振幅信息的底层3D矢量电近场分布E(r)的确定通过相对于通过聚焦离子束铣削和纳米CVD制造的E-平行和E-垂直具有选择性的探针尖端的设计来实现。

英文摘要:

In addition to the electric field E(r), the associated magnetic field H(r) and current density J(r) characterize any electromagnetic device, providing insight into antenna coupling and mutual impedance. We demonstrate the optical analogue of the radio frequency vector network analyzer implemented in interferometric homodyne scattering-type scanning near-field optical microscopy (s-SNOM) for obtaining E(r), H(r), and J(r). The approach is generally applicable and demonstrated for the case of a linear coupled-dipole antenna in the mid-infrared. The determination of the underlying 3D vector electric near-field distribution E(r) with nanometer spatial resolution and full phase and amplitude information is enabled by the design of probe tips with selectivity with respect to E-parallel and E-perpendicular fabricated by focused ion-beam milling and nano-CVD.

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