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Tight Focusing of Radially and Azimuthally Polarized Vortex Beams through a Dielectric Interface |
| ZHANG Zhi-Ming1,2;PU Ji-Xiong1;WANG Xi-Qing2 |
| 1Department of Electronic Science and Technology, Huaqiao University, Quanzhou 3620212Department of Physics, Science College, Southwest Jiaotong University, Chengdu 610031 |
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| Cite this article: |
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ZHANG Zhi-Ming, PU Ji-Xiong, WANG Xi-Qing 2008 Chin. Phys. Lett. 25 1664-1667 |
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Abstract Based on vectorial Debye theory, tight focusing of radially and azimuthally polarized vortex beams passing through a dielectric interface are studied. The intensity distribution in the focal region is illustrated by numerical calculations. We show the influence of numerical-aperture (NA) on the full-width at half maximum (FWHM) of the focal spot or the focal hole. It has been found that compared with the azimuthally polarized Bessel--Gaussian (BG) beams, the longitudinal component in the z direction of the radially polarized BG beams has no influence on the FWHM of the focal spot and hole, but enhances the total light intensity.
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41.85.Lc
77.90.+k
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Received: 25 February 2008
Published: 29 April 2008
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| PACS: |
41.85.Lc
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(Particle beam focusing and bending magnets, wiggler magnets, and quadrupoles)
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77.90.+k
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(Other topics in dielectrics, piezoelectrics, and ferroelectrics and their properties)
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