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Analysis of Ultra-Strong Coupling in Optical Waveguides

Karimi, Farhad | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43123 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Khorasani, Sina
  7. Abstract:
  8. In this project, we were intended to study the ultra-strong coupling in optical waveguides. Hence, we analyze the interaction of an electromagnetic wave with a quantum well embedded in a dielectric slab waveguide. First, we designed a QW with and alloys, which the energy of its electron-heavy holes transition is . By exploiting the envelope function approximation, we derived the wavefunction of electrons and holes, their eigen-energies, and the dipole moment of electon-holes. For finding the wavefunction of holes and their eigen-energies, we used the Luttinger Hamiltonian. Next, we calculated the electrical susceptibility of a three level quantum system (as a model for QW), by using optical Bloch equations. We derived the phenomenological optical Bloch equations, which explain the spontaneous emissions and atomic collisions. We showed that, due to interaction of an electromagnetic field with QW, a 2-Dimensional Electron Gas forms in the QW; its conductivity was derived too. The conductivity of this 2DEG can be controlled by controlling the populations of electrons and holes the energy levels. At last, we designed a slab waveguide in which a guided wave with the wavelength of have a strong interaction with the out designed QW. We calculated the propagation constant of the wave in the waveguide with conducting interfaces, by exploiting the Modified Transfer Matrix Method, and showed that the changes in the propagation constant of the wave and the conductivity of QW have linear relation. And by presenting a method for controlling the populations of electrons and holes in the energy levels, we designed an optical PM modulator, which its length is
  9. Keywords:
  10. Optical Waveguides ; Ultra-Strong Coupling Regime ; Conducting Interfaces ; Quantum Optics

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