Dvořák Petr, Klok Pavel, Kvapil Michal, Hrtoň Martin, Bouchal Petr, Krpenský Jan, Křápek Vlastimil, Šikola Tomáš
Institute of Physical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic.
CEITEC Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic.
Nanophotonics. 2022 Aug 26;11(19):4375-4386. doi: 10.1515/nanoph-2022-0215. eCollection 2022 Sep.
We demonstrate the formation of the near field with non-trivial phase distribution using surface plasmon interference devices, and experimental quantitative imaging of that phase with near-field phase microscopy. The phase distribution formed with a single device can be controlled by the polarization of the external illumination and the area of the device assigned to the object wave. A comparison of the experimental data to a numerical electromagnetic model and an analytical model assigns the origin of the near-field phase to the out-of-plane electric component of surface plasmon polaritons, and also verifies the predictive power of the models. We demonstrate a formation of near-field plane waves with different propagation directions on a single device, or even simultaneously at distinct areas of a single device. Our findings open the way to the imaging and tomography of phase objects in the near field.
我们利用表面等离子体干涉装置展示了具有非平凡相位分布的近场的形成，并通过近场相位显微镜对该相位进行了实验定量成像。单个装置形成的相位分布可以通过外部照明的偏振以及分配给物波的装置区域来控制。将实验数据与数值电磁模型和解析模型进行比较，确定了近场相位的起源是表面等离子体激元的面外电分量，同时也验证了模型的预测能力。我们展示了在单个装置上甚至在单个装置的不同区域同时形成具有不同传播方向的近场平面波。我们的发现为近场相位物体的成像和层析成像开辟了道路。
