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Presenter: Sanaul Haque
Supervisor:

Date: Fri, July 18, 2025
Time: 11:00:00 - 12:00:00
Place: EOW 502

ABSTRACT

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.