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首页> 外文期刊>Optics Letters >Resolution of objects within subwavelength range by using the near field of a dipole
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Resolution of objects within subwavelength range by using the near field of a dipole

机译：通过使用偶极子的近场来分辨亚波长范围内的物体

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摘要

We analyze the far-field resolution of apertures that are illuminated by a point dipole located at subwavelength distances. It is well known that radiation emitted by a localized source can be considered a combination of traveling and evanescent waves, when represented by the angular spectrum method. The evanescent wave part of the source can be converted to propagating waves by diffraction at the aperture; thereby it contributes to the far-field detection. Therefore one can expect an increase in the resolution of objects. We present explicit calculations showing that the resolution at the far zone is improved by decreasing the source-aperture distance. We also utilize the resolution enhancement by the near field of a dipole to resolve two closely located apertures. The results show that without the near field (evanescent field) the apertures are not resolved, whereas with the near field of the dipole the far zone intensity distribution shows improved resolution. This method eliminates the requirements of near-field techniques such as controlling and scanning closely located tip detectors.
机译：我们分析了位于子波长距离处的点偶极子所照射的孔径的远场分辨率。众所周知，当用角谱方法表示时，可以将局部源发出的辐射视为行波和e逝波的组合。光源的逝波部分可以通过孔径处的衍射转换为传播波;从而有助于远场检测。因此，可以期望物体分辨率的提高。我们提出了显式的计算结果，表明通过减小源孔距离可以提高远区的分辨率。我们还利用偶极子近场的分辨率增强来解决两个紧密靠近的孔径。结果表明，在没有近场（渐逝场）的情况下，孔径无法分辨，而在偶极子的近场中，远区强度分布显示出更高的分辨率。这种方法消除了对近场技术的要求，例如控制和扫描位置紧密的尖端检测器。

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