Mode splitting in coupled passive cavities
June, 2020
The OLASER group at IAPP fabricates high quality microresonators for lasing applications and investigates their optical properties. The left hand side of figure 1 schematically shows a standard cavity design consisting of two highly reflective micromirrors surrounding a cavity layer that leads to confinement of electromagnetic energy. Another approach is to use a system of coupled cavities shown on the right hand side.
The corresponding transmission spectra of the different cavity designs are depicted in figure 2. This figure shows that the coupling of the cavities leads to a splitting of the initial cavity mode of the standard microcavity.
Aims and tasks of the thesis
The location of the mode in the standard cavity and the location of the split modes in the coupled cavities depends on the number of layers of the microresonators, their layerthicknesses, the layerthicknesses of the cavities, and the structure or the thickness of the interlayer. This project aims to systematically investigate the mode splitting in coupled cavity systems. In the project you will
-
learn how to fabricate high quality micromirrors and microresonators by electron beam evaporation
-
fabricate different coupled cavity designs with various mirror designs, various cavity layers and changing thicknesses of the interlayer
-
investigate the mode splitting in depence e.g. of the thickness of the interlayer by measuring the optical properties of the devices you built
-
simulate the optical properties of the system by the transfer matrix method
-
describe the coupling of the cavities analytically by e.g. coupled mode equations
If you are interested please contact
christoph.schmidt6@tu-dresden.de
or
karla.roszeitis@tu-dresden.de