Adiabatic far-field sub-diffraction imaging.
Adiabatic far-field sub-diffraction imaging.
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DOI：
10.1038/ncomms8942
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发表时间：
2015-08-10
影响因子：
16.6
通讯作者：
Zhang X
中科院分区：
文献类型：
--
作者：
Cang H;Salandrino A;Wang Y;Zhang X
传统光学成像系统的有限分辨率源于这样一个事实，即物体的精细特征信息是由逝去波携带的，而逝去波在空间中呈指数衰减，因此无法到达成像平面。我们介绍了一种绝热透镜，它利用几何保形曲面来调节缓解压缩的电磁波在远场的干涉，从而形成图像。解压缩满足绝热条件，通过弥合远场和近场之间的差距，允许远场光学系统直接投影近场特征的图像。利用这些设计，我们证明了放大倍数可以达到20倍，在可见光下有可能达到50 nm以下的成像分辨率。我们的方法提供了一种将几何光学领域扩展到深亚波长尺度的方法。传统光学成像系统的分辨率受到携带精细特征信息的消逝波衰减的限制。在这里，Cang等人。提出了一种绝热透镜，它允许远场光学系统投影近场特征的图像，并在可见光下达到低于50 nm的成像分辨率。
The limited resolution of a conventional optical imaging system stems from the fact that the fine feature information of an object is carried by evanescent waves, which exponentially decays in space and thus cannot reach the imaging plane. We introduce here an adiabatic lens, which utilizes a geometrically conformal surface to mediate the interference of slowly decompressed electromagnetic waves at far field to form images. The decompression is satisfying an adiabatic condition, and by bridging the gap between far field and near field, it allows far-field optical systems to project an image of the near-field features directly. Using these designs, we demonstrated the magnification can be up to 20 times and it is possible to achieve sub-50 nm imaging resolution in visible. Our approach provides a means to extend the domain of geometrical optics to a deep sub-wavelength scale. Conventional optical imaging systems are limited in resolution by the decay of the evanescent wave carrying fine feature information. Here, Cang et al. propose an adiabatic lens that allows far-field optical systems to project an image of near-field features and achieve sub-50 nm imaging resolution in the visible.