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Far-field divergence of a vectorial plane wave diffracted by a circular aperture from the vectorial structure |
Zhou Guo-Quan(周国泉)† |
School of Sciences, Zhejiang A & F University, Lin'an 311300, China |
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Abstract Based on the vectorial structure of an electromagnetic wave, the analytical and concise expressions for the TE and TM terms of a vectorial plane wave diffracted by a circular aperture are derived in the far-field. The expressions of the energy flux distributions of the TE term, the TM term and the diffracted plane wave are also presented. The ratios of the power of the TE and TM terms to that of the diffracted plane wave are examined in the far-field. In addition, the far-field divergence angles of the TE term, the TM term and the diffracted plane wave, which are related to the energy flux distribution, are investigated. The different energy flux distributions of the TE and TM terms result in the discrepancy of their divergence angles. The influences of the linearly polarized angle and the radius of the circular aperture on the far-field divergence angles of the TE term, the TM term and the diffracted plane wave are discussed in detail. This research may promote the recognition of the optical propagation through a circular aperture.
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Received: 18 November 2010
Revised: 07 January 2011
Accepted manuscript online:
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PACS:
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42.25.Fx
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(Diffraction and scattering)
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42.25.Ja
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(Polarization)
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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.Ag
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(Apertures, collimators)
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Cite this article:
Zhou Guo-Quan(周国泉) Far-field divergence of a vectorial plane wave diffracted by a circular aperture from the vectorial structure 2011 Chin. Phys. B 20 074203
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