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Investigating the Parity-time Symmetry in Multilevel Atomic Systems

Navadeh Toupchi, Morteza | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47401 (04)
  4. University: Sharif University of Technology
  5. Department: Physics
  6. Advisor(s): Sadighi Bonabi, Rasoul
  7. Abstract:
  8. In this work a theoretical overview of Parity-Time symmetry and its application in multilevel atomic systems are presented. Because of equivalence between the Schrodinger equation and the paraxial propagation equation, complex index of refraction plays the role of complex potential. On the other side, the possibility to manipulate loss, gain and the index of refraction simultaneously, Optics is a fertile ground to investigate Parity-Time symmetry and one of this symmetry’s applications is reduction of loss in optical systems. Furthermore, In order to realize Parity time symmetry a four level atomic system under electromagnetically induced transparency condition is proposed. Optical gain resulted from an incoherent pumping as well as spatial dependency of coupling field are necessary to construct a periodic refractive index. Parity-Time symmetry demands that the real (imaginary) part of refractive index is an even (odd) function of space. This system has Parity-Time symmetry in a controllable way and it can be used for mitigating loss in optical systems. Electromagnetically induced grating is one of the most important subjects in interaction of light with matter. In this project the mechanism of this phenomenon and effect of phase of microwave field on performance of the system are investigated
  9. Keywords:
  10. Multilevel Atomic Systems ; Electromagnetical Induced Transparency ; Gain ; Losses ; Parity Time Symmetry

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