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Proceedings Paper

Concentric piecewise vector beam for superresolution and high focal depth
Author(s): Xiumin Gao; Xin Wang; Jinsong Li; Song Hu; Songlin Zhuang
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Paper Abstract

Resolution and focal depth are very important parameters in optical data storage systems, and have attracted much attention. In this article, focusing properties of concentric two-zone cylindrical vector beam are investigated theoretically by means of vector diffraction theory. The phase shift of the center zone and outer annular zone are different. Simulation results show that the focal pattern can be altered considerably by adjusting the radius of dividing circle between the two concentric portions and the phase shift of each zone. For certain phase shifts for these two zone, focal spot broadens along optical axis with increasing radius, and splits into two peaks, and then combine back into one peak again. In this evolution process, some novel focal pattern may come into being. For certain geometrical parameter and phase shift, the focal spot shrinks, which means superresolution effect appears, and at the same time, focal depth can also be widened, high focal depth companies with resolution, which is very useful in optical data storage systems.

Paper Details

Date Published: 23 October 2009
PDF: 6 pages
Proc. SPIE 7517, Photonics and Optoelectronics Meetings (POEM) 2009: Optical Storage and New Storage Technologies, 751705 (23 October 2009); doi: 10.1117/12.840813
Show Author Affiliations
Xiumin Gao, Hangzhou Dianzi Univ. (China)
Univ. of Shanghai for Science and Technology (China)
Xin Wang, Focused Photonics (Hangzhou) Inc. (China)
Jinsong Li, China Jiliang Univ. (China)
Song Hu, Hangzhou Dianzi Univ. (China)
Songlin Zhuang, Univ. of Shanghai for Science and Technology (China)

Published in SPIE Proceedings Vol. 7517:
Photonics and Optoelectronics Meetings (POEM) 2009: Optical Storage and New Storage Technologies
Masud Mansuripur; Changsheng Xie; Xiangshui Miao, Editor(s)

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