近视超透镜

Enhanced superlens imaging with loss-compensating hyperbolic near-field spatial filter

Recently a coherent optical process called plasmon injection ($Π$) scheme, which employs an auxiliary source, has been introduced as a new technique to compensate losses in metamaterials. In this work, a physical implementation of the $Π$ scheme on a thin silver film is proposed for enhanced superlens imaging. The efficacy of the scheme is illustrated by enhancing near-field imaging deeper beyond the diffraction limit in the presence of absorption losses and noise. The auxiliary source is constructed by a high-intensity illumination of the superlens integrated with a near-field spatial filter.…

基于钙钛矿的超透镜和超透镜增强的探针-物体耦合的近场检验

Near-field examination of perovskite-based superlenses and superlens-enhanced probe-object coupling

负折射率材料的平板用作具有亚衍射极限成像分辨率的超透镜，因为传播波被聚焦，并且此外，倏逝波在像平面中被重建。在这里，我们展示了一个超透镜的电倏逝场与低损耗使用钙钛矿在中红外制度。近场显微镜与可调谐自由电子激光的结合使我们能够精确地解决极化激元模式，这对超分辨率成像至关重要。我们从光谱上研究了这种透镜像面周围倏逝波的横向和纵向分布，并在超透镜波长处获得了λ/14的成像分辨率。有趣的是，在一定的距离之间的探针和样品表面，我们观察到这些倏逝场的最大值。与数值模拟的比较表明，这个最大值源于探头和物体之间的耦合增强，这可能适用于多功能电路，红外光谱和热传感器。

Spider Silk: The Mother Nature's Biological Superlens

This paper demonstrates a possible new microfiber bio near field lens that uses minor ampullate spider silk,spun from the Nephila edulis spider, to create a real time image of a surface using near field optical techniques. The microfiber bio lens is the world's first natural superlens created by exploring biological materials. The resolution of the surface image overcomes the diffraction limit, with the ability to resolve patterns at 100 nm under a standard white light source in reflection mode. This resolution offers further developments in superlens technology and paves the way for new bio o…

通过分析双缝物体的近场图像确定超透镜分辨率的鲁棒方法

Robust method to determine the resolution of a superlens by analyzing the near-field image of a two-slit object

在过去的十年中，基于超材料的超透镜，分辨率低于阿贝衍射极限，已经出现。为了获得这种超透镜的分辨率的粗略估计，通常执行由亚波长间隙\textit{d}分开的两个亚波长狭缝的成像。透镜的分辨率$Δ$对应于最小可能间隙$d_{min}$，对于该最小可能间隙$d_{min}$，可以分辨两个狭缝的不同图像（$Δ\sim d_{min}$）。在这封信中，我们提出了一个更定量的估计制造的镜头的分辨率拟合分析近场图像的配置文件，从成像的双缝对象与已知分辨率的理论负折射率透镜，实验数据。我们总结了我们的分析方法，从文献中的超透镜的3个案例的讨论。如图所示，这种方法对于快速评估制造的超分辨率透镜的性能特别有吸引力。

远场超透镜超衍射极限成像理论

Theory of optical imaging beyond the diffraction limit with a far-field superlens

最近的理论和实验研究表明，成像的分辨率远远超过衍射极限，可以获得所谓的超透镜。然而，由这种超透镜形成的图像仅在近场中，或者远离透镜的波长的一部分。本文提出了一种远场超透镜（FSL）器件，它是由一个具有周期性双折射的平面超透镜构成。我们在理论上表明，当一个对象被放置在这样的FSL的紧密接近，一个独特的图像可以在远场形成。作为一个例子，我们用数值方法证明，使用适当设计的工作在376 nm波长的FSL，可以从远场数据中获得具有30 nm间隙的40 nm线的图像。

Plasmonic Superlens Imaging Enhanced by Incoherent Active Convolved Illumination

We introduce a loss compensation method to increase the resolution of near-field imaging with a plasmonic superlens that relies on the convolution of a high spatial frequency passband function with the object. Implementation with incoherent light removes the need for phase information. The method is described theoretically and numerical imaging results with artificial noise are presented, which display enhanced resolution of a few tens of nanometers, or around one-fifteenth of the free space wavelength. A physical implementation of the method is designed and simulated to provide a proof-of-pri…