ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Focusing of elliptically polarized Gaussian beams through an annular high numerical aperture |
Chen Bao-Suan(陈宝算) and Pu Ji-Xiong(蒲继雄)† |
Department of Information Science & Engineering, Huaqiao University, Quanzhou 362021, China |
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Abstract Based on the vectorial Debye theory, the focusing properties of the Gaussian beam through an annular high numerical aperture are studied numerically, including the intensity, the phase and the orbital angular momentum properties. Then the influence of certain parameters on the focusing properties is also investigated. It is shown that sub-wavelength elliptical light spots can be obtained. And there exists a vortex in the longitudinal component of the focused field even though the incident beam is Gaussian beam, indicating that the spin angular momentum of the elliptically polarized Gaussian beam is converted into the orbital angular momentum by the focusing.
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Received: 15 November 2009
Accepted manuscript online:
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PACS:
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42.60.Jf
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(Beam characteristics: profile, intensity, and power; spatial pattern formation)
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42.79.Bh
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(Lenses, prisms and mirrors)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60977068), and the Natural Science Foundation of Fujian Province, China (Grant No. A0810012). |
Cite this article:
Chen Bao-Suan(陈宝算) and Pu Ji-Xiong(蒲继雄) Focusing of elliptically polarized Gaussian beams through an annular high numerical aperture 2010 Chin. Phys. B 19 074202
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