Far-field radiation from a cleaved cylindrical dielectric waveguide

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Angular spread in the far-field radiation pattern of a cleaved dielectric waveguide is determined from the modal structure at the surface of the waveguide using the Smythe vector integral formulation. Essential features: First, a mode exists in the fiber that has no wavelength cutoff--the so-called HE{sub 11} mode. This mode arises when non-azimuthal angular dependence of the incoming radiation is present. Second, the energy flow from this hybrid mode fills the fiber face and is not annularly shaped as opposed to the symmetric TE and TM modes. Third, the HE{sub 11} mode is not polarization dependent in contrast to the ... continued below

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7 p.

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Cerjan, C. July 9, 1996.

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  • Cerjan, C. Advanced Microtechnology Program, Lawrence Livermore National Laboratory, CA (United States)

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Description

Angular spread in the far-field radiation pattern of a cleaved dielectric waveguide is determined from the modal structure at the surface of the waveguide using the Smythe vector integral formulation. Essential features: First, a mode exists in the fiber that has no wavelength cutoff--the so-called HE{sub 11} mode. This mode arises when non-azimuthal angular dependence of the incoming radiation is present. Second, the energy flow from this hybrid mode fills the fiber face and is not annularly shaped as opposed to the symmetric TE and TM modes. Third, the HE{sub 11} mode is not polarization dependent in contrast to the TE and TM modes. Fourth, for small differences in the refractive indices between the core and cladding regions, only the HE{sub 11} mode will be supported until the next modes appear around 3.33{lambda}. At this point, three new modes can propagate and the model structure of the radiation becomes more complicated. Fifth, the far-field radiation pattern will have negligibly small angular dependence in the phases of the vector fields when only the lowest mode is present; the amplitude has an overall angular dependent form factor. Furthermore, when other modes are present (above 3.33{lambda}), the phase of the vector fields will acquire an angular dependence.

Physical Description

7 p.

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OSTI as DE96013427

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  • Optical Society of America (OSA) meeting on integrated photonics research, Boston, MA (United States), 29 Apr - 3 May 1996

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  • Other: DE96013427
  • Report No.: UCRL-JC--123010
  • Report No.: CONF-960493--19
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 378948
  • Archival Resource Key: ark:/67531/metadc688908

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  • July 9, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 23, 2016, 7:07 p.m.

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Cerjan, C. Far-field radiation from a cleaved cylindrical dielectric waveguide, article, July 9, 1996; California. (digital.library.unt.edu/ark:/67531/metadc688908/: accessed October 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.