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      Broadband circular polarizer based on high-contrast gratings

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      Author
      Mutlu, M.
      Akosman, A. E.
      Özbay, Ekmel
      Date
      2012-05-30
      Source Title
      Optics Letters
      Print ISSN
      0146-9592
      Publisher
      Optical Society of America
      Volume
      37
      Issue
      11
      Pages
      2094 - 2096
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      A circular polarizer, which is composed of periodic and two-dimensional dielectric high-contrast gratings, is designed theoretically such that a unity conversion efficiency is achieved at λ0 = 1.55 μm. The operation is obtained by the achievement of the simultaneous unity transmission of transverse magnetic and transverse electric waves with a phase difference of π/2, meaning that an optimized geometrical anisotropy is accomplished. By the utilization of the rigorous coupled-wave analysis and finite-difference time-domain methods, it is shown that a percent bandwidth of ∼50% can be achieved when the operation bandwidth is defined as the wavelengths for which the conversion efficiency exceeds 0.9.
      Keywords
      Circular polarizers
      Finite-difference time-domain (FDTD) methods
      Geometrical anisotropy
      High contrast
      Operation bandwidth
      Phase difference
      Rigorous coupled wave analysis
      Transverse electric waves
      Transverse magnetic
      Circular polarization
      Conversion efficiency
      Electromagnetic waves
      Finite difference time domain method
      Diffraction gratings
      Permalink
      http://hdl.handle.net/11693/21445
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OL.37.002094
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Nanotechnology Research Center (NANOTAM) 1006
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