Shanghai Key Laboratory of Modern Optics System, School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China.
Opt Lett. 2011 Jun 15;36(12):2200-2. doi: 10.1364/OL.36.002200.
We investigate in detail the focusing properties of the composite vector beam (CVB) composed of two orthogonally linearly polarized beams with inhomogeneous polarization modulation. By optimizing the modulation factor, a multifocus with excellent quality is obtained, where the sizes of each focus are fairly smaller than that of the focusing spot of a radially polarized beam, the uniformity in the intensity of the focal spots is as high as 1, and the distributions of each focal spot have nearly circular symmetry. In order to decrease the power loss of the incident beam, the CVB formed by an annular beam is demonstrated as the substitute for the optimized CVB formed by a Gaussian beam. This work is important for high-resolution and high-speed imaging in biology and micro-nanofabrication.
我们详细研究了由两个正交线偏振光束组成的具有不均匀偏振调制的复合矢量光束（CVB）的聚焦特性。通过优化调制因子，获得了具有优异质量的多焦点，其中每个焦点的尺寸都比径向偏振光束的聚焦光斑小得多，焦点强度的均匀性高达 1，并且每个焦点的分布具有几乎圆形的对称性。为了减少入射光束的功率损耗，用环形光束形成的 CVB 作为替代，优化了由高斯光束形成的 CVB。这项工作对于生物学和微纳加工中的高分辨率和高速成像非常重要。
