The Coupling Effect Of Resonant Modes In Hexagonal ZnO Microcavities

Abstract

The hexagonal crystal structure of zinc oxide makes it easy to produce resonant modes such as quasi-WGMs and WGM In this thesis we used the FDTD finite-difference time domain method to simulate hexagonal ZnO cavities We improved the simulation space by using triangle meshes and a symmetric axis so as to make the simulation space fit hexagonal ZnO cavities and reduce simulation time Then we simulated a hexagonal ZnO cavity by two kinds of the simulation space One is square-meshed and the other is triangle-meshed We analyzed the wavelengths of the resonant modes of the two spectra and concluded that the triangle-meshed coordinate system was a better choice than the square-meshed one when hexagonal cavities were simulated Next we made a hexagonal ZnO cavity couple with a silica substrate or another same-sized cavity The intensity increased result from the coupling effect Besides we coupled a hexagonal ZnO cavity of which the side length was 1090 nanometers with another one of which the side length was 2000 nanometers and its spectrum looked like the one with gating effect

Date of Award	2019
Original language	English
Supervisor	Shih-hui Chang (Supervisor)