Generation of sub wavelength super-long dark channel using high NA lens axicon
Generation of sub wavelength super-long dark channel using high NA lens axicon
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DOI：
10.1364/ol.37.000999
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发表时间：
2012-03-15
期刊：
影响因子：
3.6
通讯作者：
Pillai, T. V. S.
中科院分区：
文献类型：
--
作者：
Lalithambigai, K.;Suresh, P.;Pillai, T. V. S.
基于矢量衍射理论，研究了双环形方位偏振光束通过高数值孔径（NA）轴棱锥透镜的聚焦特性。我们观察到，我们提出的系统产生的0.5 λ的亚波长焦孔具有大的均匀焦深48 λ没有任何环形孔径。我们还观察到，在焦点附近的总强度的分布几乎没有变化的程度截断β的入射光束的瞳孔。作者预计，这种超长暗通道可能会在光学、生物和大气科学中找到应用。(C)2012美国光学学会
We investigate the focusing properties of a double-ring-shaped azimuthally polarized beam by a high numerical aperture (NA) lens axicon based on vector diffraction theory. We observe that our proposed system generates a sub wavelength focal hole of 0.5 lambda having large uniform focal depth of 48 lambda without any annular aperture. We also observed that the distribution of the total intensity near the focus has little variation with the degree of truncation beta of the incident beam by the pupil. The authors expect such a super-long dark channel may find applications in optical, biological, and atmospheric sciences. (C) 2012 Optical Society of America