在中间区域中的超极限光聚焦
Beyond-limit light focusing in the intermediate zone
摘要：
我们的实验表明，一种新的纳米透镜设计的等离子体亚波长孔径可以将光聚焦到一个单一的线，其宽度超过衍射极限，设置在波长的一半最小可实现的线宽。测量表明，在线宽小于2 < kr < 4的中间区，近场对聚焦光的影响可以忽略不计。因此，作为理论预测的验证，聚焦的场是辐射的，并且具有能够传播到远区的动量，这与极限有关。
英文摘要：
We experimentally demonstrate that a new nanolens of designed plasmonic subwavelength aperture can focus light to a single-line with its width beyond the diffraction limit that sets the smallest achievable line width at half the wavelength. The measurements indicate that the effect of the near-field on the light focused is negligible in the intermediate zone of 2 < kr < 4 where the line-width is smaller than the limit. Thus, as a verification of theoretical prediction, the fields focused are radiative and with a momentum capable of propagating to the far zone as concerned by the limit.
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