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Faculty of Graduate Studies

Sanaul Haque

  • BSc (American International University-Bangladesh, 2015)
Notice of the Final Oral Examination for the Degree of Master of Applied Science

Topic

High Q Polygon Mode Formation and Nano Antenna Fabrication on Whispering Gallery Mode Microcavities

Department of Electrical and Computer Engineering

Date & location

  • Tuesday, July 22, 2025

  • 1:30 P.M.

  • Engineering Office Wing, Room 502

  • And Virtual Defence

Reviewers

Supervisory Committee

  • Dr. Tao Lu, Department of Electrical and Computer Engineering, ßÉßɱ¬ÁÏ (Supervisor)

  • Dr. Thomas E. Darcie, Department of Electrical and Computer Engineering, UVic (Member) 

External Examiner

  • Dr. Peter Loock, Department of Chemistry, ßÉßɱ¬ÁÏ 

Chair of Oral Examination

  • Dr. Raad Nashmi, Department of Biology, UVic

Abstract

This thesis investigates whispering gallery mode microresonators, focusing on two key aspects. First, we explore the polygon modes on a LiNbO3 microdisk, formed by the coherent combination of multiple whispering gallery modes excited by a tapered fiber placed in its close proximity. These polygon modes display ultra high optical quality compared to those observed in deformed cavities. Consequently, optomechanical oscillation and optical frequency comb generation were observed in polygon modes. The second part studies the fabrication techniques to integrate a non-plasmonic nanoantenna onto the surface of a microcavity. We demonstrated a precision fusion technique to integrate a silica nanoantenna onto an ultra-high Q silica microsphere with low optical quality factor (Q) degradation, enabling a potential enhancement in cavity-based sensing resolution.

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