| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Radially and Azimuthally Polarized Beams Generated by a Composite Spiral Zone Plate |
| HUA Yi-Lei**, WANG Zi-Qiang, LI Hai-Liang, GAO Nan, DU Yu-Chan |
| Key Laboratory of Nano-Fabrication and Novel Devices Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, Beijing 100029 |
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Abstract We present a diffractive method for obtaining azimuthal and radially polarized beams. This method involves a modified half-wave plate, a composite spiral zone plate, a pinhole and a lens. Two composite spiral zone plates are combined and assisted by a pinhole and a lens, to transform a circularly polarized beam into a radially polarized or an azimuthal polarized beam. This method is investigated numerically using diffraction theory. The field distributions on the focal spot of the composite spiral zone plates and the output cylindrical beams are calculated. Finally, the use of this method to generate cylindrical vector beams is validated.
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Received: 14 May 2012
Published: 31 July 2012
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