Acta Optica Sinica, Volume. 30, Issue s1, 100404(2010)
Formation of a Small Three-Dimensional Dark Spot with a High Uniform Light Wall
The three-dimensional (3D) dark with high uniform light wall is very useful for many applications such as 3D dark spot microscopy and 3D dark spot trap. A new method is proposed to generate a 3D dark spot surrounded by uniform light at all directions. In this method, a double-ring-shaped radially polarized beam and a single-ring-shaped azimuthally polarized beam are incoherently superimposed. When two component beams of the composite beam have a proper intensity ratio, a 3D dark spot with high uniform light wall can be generated by focusing the composite beam. Compared with the result obtained from a single double-ring-shaped radially polarized beam focusing, the uniformity of the light wall surrounding the 3D dark spot obtained from the superimposed beam focusing can be increased twice or more.
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Zhang Yaoju, Wang Yanyan, Shi Tianzhen, Fang Chaolong, Taikei Suyama. Formation of a Small Three-Dimensional Dark Spot with a High Uniform Light Wall[J]. Acta Optica Sinica, 2010, 30(s1): 100404
Category: Fourier optics and signal processing
Received: Mar. 18, 2010
Accepted: --
Published Online: Dec. 8, 2010
The Author Email: Yaoju Zhang (zhangyaoju@sohu.com)