Generation of a sub-diffraction hollow ring by shaping an azimuthally polarized wave.
Generation of a sub-diffraction hollow ring by shaping an azimuthally polarized wave.
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通过塑造方位角偏振波生成亚衍射空心环
DOI：
10.1038/srep37776
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发表时间：
2016-11-23
影响因子：
4.6
通讯作者：
Luo XG
中科院分区：
文献类型：
--
作者：
Chen G;Wu ZX;Yu AP;Zhang ZH;Wen ZQ;Zhang K;Dai LR;Jiang SL;Li YY;Chen L;Wang CT;Luo XG
亚衍射光学空心环的产生在光学显微镜、光镊、纳米光刻等领域有着广泛的应用。方位偏振光是用于创建光学中空环结构的良好候选者。人们在理论上提出了各种方法来聚焦方位偏振光产生亚波长空心环，但没有实验验证，特别是亚衍射聚焦。超振荡是一种很有前途的亚衍射光学聚焦整形方法。本文提出了一种平面亚衍射衍射透镜，它具有600 λ的超长焦距和0.64的小数值孔径。通过对方位向偏振波整形，实验产生了亚衍射空心环。空心环的半高宽为0.61 λ，小于透镜衍射极限0.78 λ，观测到的最大旁瓣强度仅为峰值强度的10%。
The generation of a sub-diffraction optical hollow ring is of great interest in various applications, such as optical microscopy, optical tweezers, and nanolithography. Azimuthally polarized light is a good candidate for creating an optical hollow ring structure. Various of methods have been proposed theoretically for generation of sub-wavelength hollow ring by focusing azimuthally polarized light, but without experimental demonstrations, especially for sub-diffraction focusing. Super-oscillation is a promising approach for shaping sub-diffraction optical focusing. In this paper, a planar sub-diffraction diffractive lens is proposed, which has an ultra-long focal length of 600 λ and small numerical aperture of 0.64. A sub-diffraction hollow ring is experimentally created by shaping an azimuthally polarized wave. The full-width-at-half-maximum of the hollow ring is 0.61 λ, which is smaller than the lens diffraction limit 0.78 λ, and the observed largest sidelobe intensity is only 10% of the peak intensity.
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