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arXiv 2201.00266physics.optics
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用于非侵入式近场光学显微镜的隐形近场探针

Cloaked near-field probe for non-invasive near-field optical microscopy

Felipe Bernal Arango, Filippo Alpeggiani, Donato Conteduca, Aron Opheij, Aobo Chen, Mohamed I. Abdelrahman, Thomas Krauss, Andrea Alu, Francesco Monticone, L. Kuipers

摘要:

近场扫描光学显微镜是一种在衍射极限以下成像的强大技术,已广泛应用于生物医学成像和纳米光子学。然而,当被测量的电磁场被强烈地限制时,它们可以被近场探针本身的存在严重扰动。在这里,从散射抵消隐身斗篷,惠更斯-克尔散射体,和隐形传感器的灵感,我们设计和制造的近场探测器。我们表明,通过适当的纳米结构的探针,其电和磁的极化率可以控制和平衡。因此,探测器引起的扰动可以在很大程度上被抑制,有效地掩盖了近场探测器,而不妨碍其测量能力。我们通过比较传统和纳米结构探针与具有代表性的纳米光子结构,即一维光子晶体腔的相互作用,实验证明了隐身效果。我们的研究结果表明,通过设计探针的结构,可以系统地控制其对样品的共振场的反作用,并且在探针-样品距离为100 nm时,使用我们的大多数改进的探针可以将扰动减少>70%,并且对于最佳探针可以减少多达一个数量级。我们的工作为经典和量子纳米系统的非侵入近场光学显微镜铺平了道路。

英文摘要:

Near-field scanning optical microscopy is a powerful technique for imaging below the diffraction limit, which has been extensively used in bio-medical imaging and nanophotonics. However, when the electromagnetic fields under measurement are strongly confined, they can be heavily perturbed by the presence of the near-field probe itself. Here, taking inspiration from scattering-cancellation invisibility cloaks, Huygens-Kerker scatterers, and cloaked sensors, we design and fabricate a cloaked near-field probe. We show that, by suitably nanostructuring the probe, its electric and magnetic polarizabilities can be controlled and balanced. As a result, probe-induced perturbations can be largely suppressed, effectively cloaking the near-field probe without preventing its ability to measure. We experimentally demonstrate the cloaking effect by comparing the interaction of conventional and nanostructured probes with a representative nanophotonic structure, namely, a 1D photonic-crystal cavity. Our results show that, by engineering the structure of the probe, one can systematically control its back-action on the resonant fields of the sample and decrease the perturbation by >70% with most of our modified probes, and by up to one order of magnitude for the best probe, at probe-sample distances of 100 nm. Our work paves the way for non-invasive near-field optical microscopy of classical and quantum nano-systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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