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Faculty of Graduate Studies

Saeed Farajollahi

  • M.Sc. (Sharif University of Technology, 2015)

  • B.Sc. (Sharif University of Technology, 2013)

Notice of the Final Oral Examination for the Degree of Doctor of Philosophy

Topic

Three Dimensional Full Vector Modelling of Whispering Gallery Microcavities

Department of Electrical and Computer Engineering

Date & location

  • Friday, August 28, 2026

  • 10:00 A.M.

  • Virtual Defence

Reviewers

Supervisory Committee

  • Dr. Tao Lu, Department of Electrical and Computer Engineering, 糖心视频 (Supervisor)

  • Dr. Levi Smith, Department of Electrical and Computer Engineering, 糖心视频 (Member)

  • Dr. Rogério de Sousa, Department of Physics and Astronomy, 糖心视频 (Outside Member) 

External Examiner

  • Dr. Xun Li, Department of Electrical and Computer Engineering, McMaster, University 

Chair of Oral Examination

  • Dr. Mohammadhossein Karimi, Department of Mechanical Engineering, 糖心视频

     

Abstract

This dissertation investigates the three-dimensional full-wave electromagnetic modeling of whispering gallery mode (WGM) resonators. The formation of high-quality factor polygon mode in lithium niobate (LN) microdisks was explained through three dimensional perturbation method. The effect of three-dimensional features of the cavity, like microdisk wedge-angle and coupling fiber were investigated and it was shown how the perturbation from fiber can be strong enough to form these modes without significantly lowering Q through fiber coupling loss. Furthermore, a bi-directional mode matching formalism was introduced. This formalism was used to model mode splitting phenomenon in WGM sensing applications. The Q-degradation of the cosine mode was analyzed in details and parameters like the radiation pattern of the cavity were calculated. Explaining the particle sizing scheme that relies on simultaneous measurement of Q-degradation and splitting wavelength using our method, makes future scattering analysis of WGM micro resonators more promising.

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