Super-resolution optical telescopes with local light diffraction shrinkage.
Super-resolution optical telescopes with local light diffraction shrinkage.
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DOI：
10.1038/srep18485
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发表时间：
2015-12-18
影响因子：
4.6
通讯作者：
Luo X
中科院分区：
文献类型：
--
作者：
Wang C;Tang D;Wang Y;Zhao Z;Wang J;Pu M;Zhang Y;Yan W;Gao P;Luo X
由于物镜尺寸巨大以及对远处目标的操控不可行，望远镜无法从现有的超分辨率成像中寻求帮助，例如扫描近场光学显微镜、完美透镜和受激发射损耗显微镜。本文提出了与光学超振荡现象相关的局部光衍射收缩，用于实时光学恢复望远镜系统中的超分辨率成像信息。研究发现，得益于基于中继超表面的超振荡成像光学器件，可以在较小的局部视场中观察到隐藏在望远镜衍射极限光学图像中的精细目标特征，其中可以恢复一些超出望远镜截止频率的局部傅立叶分量。作为实验实例，获得了瑞利准则的最小分辨率0.55，并演示了通过叠加多个局部视场对复杂目标和大目标进行成像。这项研究为实时、非相干和超分辨率望远镜提供了一种无需操纵远处目标的方法。更重要的是，它为中继光学无法比物镜系统提供更多成像细节的常识提供了反直觉的证据。
Suffering from giant size of objective lenses and infeasible manipulations of distant targets, telescopes could not seek helps from present super-resolution imaging, such as scanning near-field optical microscopy, perfect lens and stimulated emission depletion microscopy. In this paper, local light diffraction shrinkage associated with optical super-oscillatory phenomenon is proposed for real-time and optically restoring super-resolution imaging information in a telescope system. It is found that fine target features concealed in diffraction-limited optical images of a telescope could be observed in a small local field of view, benefiting from a relayed metasurface-based super-oscillatory imaging optics in which some local Fourier components beyond the cut-off frequency of telescope could be restored. As experimental examples, a minimal resolution to 0.55 of Rayleigh criterion is obtained, and imaging complex targets and large targets by superimposing multiple local fields of views are demonstrated as well. This investigation provides an access for real-time, incoherent and super-resolution telescopes without the manipulation of distant targets. More importantly, it gives counterintuitive evidence to the common knowledge that relayed optics could not deliver more imaging details than objective systems.