Fabrication and Optical Measurements of Microdisks Embedded with Colloidal Quantum Dots
Date Issued
2009
Date
2009
Author(s)
Wu, Hong-Shyang
Abstract
In this thesis, a passive microdisk microcavity has been successfully fabricated using a silicon and silicon dioxide dual structure. Two types of colloidal Quantum Dots (QDs) were then deposited to form the active media for light emission.he quantum dots used are lead sulfide (PbS) of IV-VI group and cadmium selenide / zinc sulfide (CdSe/ZnS) of II-VI group. PbS QDs deposition was achieved by relaxation deposition onto microcavities through solvent evaporation. In such cavity, Whispering Gallery Mode (WGM) resonances were successfully observed at a temperature of 78 Kelvin. For CdSe quantum dots, better optical confinement was achieved with deposited CdSe quantum dots sandwiched by SiO2 layers for better WGM resonance support. As the CdSe quantum dots emit at visible wavelength, WGM observation was made possible by implementing a Charged Coupled Device (CCD) for mode detection.
Subjects
microcavity
quantum dots
Type
thesis
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