Shifting the spherical focus of a 4Pi focusing system.
Shifting the spherical focus of a 4Pi focusing system.
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DOI：
10.1364/oe.19.000673
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发表时间：
2011-01
期刊：
影响因子：
3.8
通讯作者：
Shaohui Yan;Baoli Yao;R. Rupp
中科院分区：
文献类型：
--
作者：
Shaohui Yan;Baoli Yao;R. Rupp
在4Pi聚焦系统中，径向偏振激光束可以聚焦到一个球形焦斑上。对于许多应用，例如移动被捕获的粒子或扫描样品，人们希望在不移动透镜或激光束的情况下沿着光轴改变焦斑的位置。我们演示了如何通过在透镜的瞳孔平面调制输入场的相位来实现这一点。所需的相位调制函数由理查兹-沃尔夫积分中平面波因子的球面波展开来确定。
In a 4Pi focusing system radially polarized laser beams can be focused to a spherical focal spot. For many applications, e.g., for moving trapped particles or for scanning a specimen, one would like to change the position of focal spot along the optical axis without moving lenses or laser beams. We demonstrate how this can be achieved by modulating the phase of the input field at the pupil plane of the lens. The required phase modulation function is determined by spherical wave expansion of the plane wave factors in the Richards-Wolf integral.