One-Shot Measurement of the Three-Dimensional Electromagnetic Field Scattered by a Subwavelength Aperture Tip Coupled to the Environment,ACS Photonics

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One-Shot Measurement of the Three-Dimensional Electromagnetic Field Scattered by a Subwavelength Aperture Tip Coupled to the Environment
ACS Photonics ( IF 6.5 ) Pub Date : 2018-03-02 00:00:00 , DOI: 10.1021/acsphotonics.7b01611
Nancy Rahbany ₁ , Ignacio Izeddin ₁ , Valentina Krachmalnicoff ₁ , Rémi Carminati ₁ , Gilles Tessier ₂ , Yannick De Wilde ₁

Affiliation

Near-field scanning optical microscopy (NSOM) achieves subwavelength resolution by bringing a nanosized probe close to the surface of the sample. This extends the spectrum of spatial frequencies that can be detected with respect to a diffraction limited microscope. The interaction of the probe with the sample is expected to affect its radiation to the far field in a way that is often hard to predict. Here we address this question by proposing a general method based on full-field off-axis digital holography microscopy which enables to study in detail the far-field radiation from a NSOM probe as a function of its environment. A first application is demonstrated by performing a three-dimensional (3D) tomographic reconstruction of light scattered from the subwavelength aperture tip of a NSOM, in free space or coupled to transparent and plasmonic media. A single holographic image recorded in one shot in the far field contains information on both the amplitude and the phase of the scattered light. This is sufficient to reverse numerically the propagation of the electromagnetic field all the way to the aperture tip. Finite Difference Time Domain (FDTD) simulations are performed to compare the experimental results with a superposition of magnetic and electric dipole radiation.

中文翻译：

由亚波长孔径尖端耦合到环境的三维电磁场的单次测量

近场扫描光学显微镜（NSOM）通过将纳米探针靠近样品表面来实现亚波长分辨率。这扩展了相对于衍射受限显微镜可以检测到的空间频率的频谱。预计探针与样品的相互作用会以一种通常难以预测的方式影响其向远场的辐射。在这里，我们通过提出一种基于全场离轴数字全息显微术的通用方法来解决这个问题，该方法能够详细研究NSOM探针随环境变化的远场辐射。通过对从NSOM的亚波长孔径尖端散射的光，在自由空间中或耦合到透明和等离子体介质的光进行三维（3D）层析成像重建，证明了第一个应用程序。在远场一次拍摄中记录的单个全息图像包含有关散射光的幅度和相位的信息。这足以在数值上逆转电磁场一直传播到孔径尖端的过程。进行了时域有限差分（FDTD）仿真，以将实验结果与磁偶极子辐射和电偶极子辐射的叠加进行比较。

更新日期：2018-03-02

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