Polarization-independent beam splitting by a photonic crystal right prism |
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Authors: | Melike B Yucel Ahmet Cicek Bulent Ulug |
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Institution: | 1. Department of Physics, Faculty of Science, Akdeniz University, Campus, 07058, Antalya, Turkey 2. Department of Physics, Faculty of Arts and Sciences, Mehmet Akif Ersoy University, Campus, 15100, Burdur, Turkey
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Abstract: | Splitting of light waves by a two-dimensional photonic crystal associated with source size and dispersion relation of photonic crystal at a wavelength of 1,550 nm without disturbing periodicity is numerically demonstrated via finite-difference time-domain simulations. Split branches in either polarization state make plus or minus 45° with the 11] direction and propagate in a self-collimated manner with equal amplitude and phase. Sixty-four percent of total transmittance is attained provided that the waves are coupled and collected through appropriate planar waveguides. Alternatively, approximately 50 % total transmittance for both polarizations can be obtained by application of an anti-reflection coating layer at the input face. Polarization-independent beam splitting occurs in a narrow range around the target wavelength, while its transverse-magnetically polarized sub-harmonic can also be split. The photonic crystal can also operate as a polarizing splitter at oblique incidence. |
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