22 February 2008 All-optical signal processing in photonic crystals covered with fast nonlinear materials
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In our work, we considered theoretically 1D and 2D photonic bandgap (PBG) systems containing nonlinear covers with short response time in femtosecond area. The short signal passing through the PBG system the angular total reflection area was calculated by FDTD, transfer matrix and perturbation theory methods. The photonic structure vs intensity behaviour was investigated for a few systems consisting of periodically layered structures covered with an optically nonlinear material. Theoretical estimations of the logical gate parameters were made for linear 2D Si-SiO2 , Si-air and Ge-Se photonic crystals covered with the nonlinear doped glass. It was shown that the beam angular-frequency diagrams contain extremely sensitive areas inside the total reflection range, where the weak nonlinearity leads to dramatic change in light reflection and transmission. Two principal schemes of all-optical logical devices were analyzed and possible applications in all-optical adders and logical gates were discussed.
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Eugene Ya. Glushko, Eugene Ya. Glushko, Alexander E. Glushko, Alexander E. Glushko, Vladimir N. Evteev, Vladimir N. Evteev, Alexander N. Stepanyuk, Alexander N. Stepanyuk, "All-optical signal processing in photonic crystals covered with fast nonlinear materials", Proc. SPIE 6889, Physics and Simulation of Optoelectronic Devices XVI, 688919 (22 February 2008); doi: 10.1117/12.762888; https://doi.org/10.1117/12.762888

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