Focal shift of three-portion concentric piecewise cylindrical vector beam |
| |
Authors: | Xiumin Gao Song Hu Haitao Gu Jian Wang |
| |
Institution: | Electronics and Information College, Hangzhou Dianzi University, Hangzhou 310018, PR China |
| |
Abstract: | Focal shift of a concentric piecewise cylindrical vector beam is investigated by means of vector diffractive theory. A section of the beam consists of three concentric portions. The center circle portion and outer annular portion are radial polarized, and the inner annular portion is generalized polarized. The phase of the inner annular portion is tunable. For certain geometric parameters of the beam, the focal shift occurs and can be adjusted by phase shift and polarized direction of the inner annular portion. For some cases, a three-peak focal pattern may occur, and peaks shift in the same direction, and one local minimum also shifts. For some other cases, a two-peak focal pattern may occur with shifting peaks. The tunable quantitative focal shift is investigated in detail. |
| |
Keywords: | Cylindrical vector beam Focal shift Vector diffractive theory |
本文献已被 ScienceDirect 等数据库收录! |
|