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    A quantum description of linear, and non-linear optical interactions in arrays of plasmonic nanoparticles

    , Article Journal of Modern Optics ; Volume 65, Issue 10 , 2018 , Pages 1235-1244 ; 09500340 (ISSN) Arabahmadi, E ; Ahmadi, Z ; Rashidian, B ; Sharif University of Technology
    Taylor and Francis Ltd  2018
    A quantum theory for describing the interaction of photons and plasmons, in one- and two-dimensional arrays is presented. Ohmic losses and inter-band transitions are not considered. We use macroscopic approach, and quantum field theory methods including S-matrix expansion, and Feynman diagrams for this purpose. Non-linear interactions are also studied, and increasing the probability of such interactions, and its application are also discussed. © 2018 Informa UK Limited, trading as Taylor & Francis Group  

    Fast convergent and unconditionally stable galerkin's method with adaptive hermite-gauss expansion for guided-mode extraction in two-dimensional photonic crystal based waveguides

    , Article Journal of the Optical Society of America B: Optical Physics ; Volume 26, Issue 1 , 2009 , Pages 169-175 ; 07403224 (ISSN) Sarrafi, P ; Mehrany, K ; Sharif University of Technology
    Optical Society of American (OSA)  2009
    It has been recently shown that guided modes in two-dimensional photonic crystal based structures can be fast and efficiently extracted by using the Galerkin's method with Hermite-Gauss basis functions. Although quite efficient and reliable for photonic crystal line defect waveguides, difficulties are likely to arise for more complicated geometries, e.g., for coupled resonator optical waveguides. First, unwanted numerical instability may well occur if a large number of basis functions are retained in the calculation. Second, the method could have a slow convergence rate with respect to the truncation order of the electromagnetic field expansion. Third, spurious solutions are not unlikely to... 

    FDTD analysis of distributed amplifiers based on the fully distributed model

    , Article 2007 Asia-Pacific Conference on Applied Electromagnetics, APACE2007, Melaka, 4 December 2007 through 6 December 2007 ; 2007 ; 1424414350 (ISBN); 9781424414352 (ISBN) Mirzavand, R ; Abdipour, A ; Shishegar, A. A ; Sharif University of Technology
    In this paper a wave approach has been introduced to study the performance of a distributed amplifier. The time domain response of a FET is obtained by means of the fully distributed model. By applying the procedure to a pi-gate GaAs MESFET, the S matrix is computed from time domain results over a frequency range of 2-20 GHz. Scattering parameters of gate and drain lines are extracted from three-dimensional FDTD simulation. The result obtained by this wave approach is compared with device lumped model and Quasi static approach of transmission line. © 2007 IEEE