Ahmad Ajdarzadeh Oskouei

Publications (6)2.3 Total impact

• Article: Simulation and estimation of normal dispersion phenomenon in an acentric organic crystal (NPP) by the quantum photonic approach

  Hassan Kaatuzian, Ali Akbar Wahedy Zarch, Ahmad Ajdarzadeh Oskouei, Ahmad Amjadi
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  ABSTRACT: In this paper, we present a nano-quantum photonic approach for the calculation of normal dispersion phenomena in organic crystals such as N-(4-nitrophenyl)-L-prolinol(NPP). We assume that a laser beam consists of a flow of energetic particles that interact with the distorted π-electron system. We approximate the distorted π-electron cloud by an ellipse to simplify calculations. By the precise analysis of photon interaction with the π-electron system of benzene ring in the NPP crystal, we obtain the refractive index in any wavelength by Monte Carlo simulation. The maximum error between our simulation results and the measurement data is 0.058, which is agreeable.
  Modelling and Simulation in Materials Science and Engineering 11/2007; 15(8):869. · 2.30 Impact Factor
• Source

  Available from: ArXiv

  Article: Analysis and Design of an Organic High Speed Digital Electro-Optic Switch

  Ali Akbar Wahedy Zarch, Hassan Kaatuzian, Ahmad Ajdarzadeh Oskouei, Ahmad Amjadi
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  ABSTRACT: We have analyzed and designed an organic high speed digital optical switch (DOS) based on transverse electro-optic effect. In analysis section, we proposed a quantum photonic model (QPM) to explain linear electro-optic (EO) effect. This model interpret this effect by photon-electron interaction in attosecond regime. We simulate applied electric field on molecule and crystal by Monte-Carlo method in time domain. We show how a waveguide response to an optical signal with different wavelengths when a transverse electric field applied to the waveguide. In design section, we configure conceptually a 2 * 2 EO switch with full adiabatic coupler. In this DOS, we use a rib waveguides that its core has been constructed from NPP crystal. This switch is smaller at least to one-half of similar DOS in dimensions.
  06/2007;
• Source

  Available from: ArXiv

  Article: Electro-Optic Effect Explanation with Quantum Photonic Model

  Hassan Kaatuzian, AliAkbar Wahedy Zarch, Ahmad Amjadi, Ahmad Ajdarzadeh Oskouei
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  ABSTRACT: In this paper, we have explained transverse electro-optic effect by quantum-photonic model (QPM). This model interpret this effect by photon-electron interaction in attosecond regime. We simulate applied electric field on molecule and crystal by Monte-Carlo method in time domain when a light beam is propagated through the waveguide. We show how the waveguide response to an optical signal with different wavelengths when a transverse electric field applied to the waveguide.
  06/2007;
• Source

  Available from: arxiv.org

  Article: Electromagnetically Induced Transparency using six level atoms doped in the crystalline medium

  Hassan Kaatuzian, Sina Mehrabadi, Ahmad Ajdarzadeh Oskouei
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  ABSTRACT: Using the density matrix theory of interaction between light and matter, and relevant parameters of the relaxation rates for a six-level model, we have shown theoretically the possibility of realizing Electromagnetically Induced Transparency (EIT) and Slow Light effects in Pr(+3 ion) doped YSO crystal. In addition, we have presented a simplified method to analyse EIT effect in such a six level atomic system. Finally, we have demonstrated results of numerical calculation and have compared them with experimental measurements reported recently.
  12/2005;
• Source

  Available from: arxiv.org

  Article: Analysis of Quantum Light Memory in Atomic Systems (Final)

  Hassan Kaatuzian, Ali Rostami, Ahmad Ajdarzadeh Oskouei
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  ABSTRACT: We extend the theory of quantum light memory in atomic ensemble of Lambda type atoms with considering lower levels coherence decay rate and one and two-photon detunings from resonances in low intensity and adiabatic passage limit. We obtain that with considering these parameters, that there will be a considerable decay of probe pulse and stored information; also, we obtain that the group velocity of probe (light) pulse and its amplitude does not tend to zero by turning off the control field. We propose a method to keep the probe pulse in small values in turn off time of control field and to reduce the loss of the stored probe pulse. In addition, we obtain that in the Off-resonance case there will be a considerable distortion of the output light pulse that causes in loss of the stored information, then we present limitations for detunings and therefore for bandwidths of practical lasers also limitations for maximum storage time to have negligible distortion of stored information. We finally present the numerical calculations and compare them with analytical results.
  03/2004;
• Article: A semiclassical approach for electro-optic effect

  AliAkbar Wahedy Zarch, Hassan Kaatuzian, Ahmad Amjadi, Ahmad Ajdarzadeh Oskouei
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  ABSTRACT: In this article, we present a semiclassical approach for modeling of electro-optic (EO) effect. We calculate phase retardation between x and y polarizations of optical electric field when a transverse external electric field is applied. Our results are well agreed with experimental measurements. Moreover, we show when wavelength of optical signal decreases, the phase retardation increases. (c) 2008 Elsevier B.V. All rights reserved.