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All-Optical Switching Based on Quantum Interference and Coherence

Nikaeen, Morteza | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45754 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi-Bonabi, Rasoul
  7. Abstract:
  8. Quantum interference and coherence are responsible for a novel set of physical phenomena, where Electromagnetically Induced Transparency is one of the most important of them. Each of these phenomena can make a new possibility for modifying the optical properties of a coherently prepared medium. Fast controllability of optical properties in one hand and flexibility of this control process in the other hand, are important factors that attract interests into coherent control of light .Coherent control of optical properties of the medium can be used in designing some advanced and challenging devices including All-Optical Switches. In this work , in a consistent picture, using a step by step method , all required physical basis for understanding the electromagnetically induced transparency phenomena are extracted .then, the capacities of this phenomena in order to designing an all-optical switch is studied. To this end, the effects of various involved parameters for controlling the probe laser field by means of control laser fields are investigated. Especially, the effect of relative phase of control laser fields on the optical behavior of a multi-level atomic system is investigated in details. Finally, by a novel way, we present a new method for imposing the relative phase of applied laser fields in the optical behavior of a presented four-level atomic system, in order to control the absorption of probe laser field more conveniently
  9. Keywords:
  10. Fuzzy Control ; Absorption Coefficent ; Quantum Interference ; Quantum Coherence ; Closed Loop System ; Electromagnetical Induced Transparency ; Coherent Control ; All Optical Switch ; Double-Coupled Structure

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