| Summary: | 博士 === 國立中央大學 === 光電科學與工程學系 === 102 === This thesis is distributed into two parts. The first part is about the optical properties of quantum dots. And the second part is about the applications of quantum dots in optics.
All of the optical properties in quantum dots are based on the concept of confined energy states, or energy bands. The known mathematics tools for this issue have individual restrictions although numerous approaches are proposed. A novel approach is proposed in this thesis, Iterative Boundary Method (IBM), which is able to calculate the confined energy levels, energy bands, of any kind of potential profile. The calculations have been verified by published data, experimental results and other known approaches. Otherwise, CdS and CdSe/ZnS quantum dots are also employed to our experiments to compare with the simulations. Moreover, we find a misinterpretation exists in many published reports about CdSe/ZnS core-shell quantum dots. This mistake is figured out in this thesis and proved by IBM.
About the applications of quantum dots in optics, we starts from an ideal that a layer owns index like dielectric layer and negative extinction coefficients. The –k layer is studied systematically including spectra, admittance and optimization of multilayers. The conventional method of thin-film optics is extended for the special layers successfully. This is the first research that provides complete analysis of –k layer and optimization.
Consequently, optical filters with quantum dots are fabricated. Narrow band pass filters are employed to demonstrate the contribution of quantum dots in filters. These filters have different transmittance due to characteristics while exciting light is on and off, even exceeds 100% due to participation of quantum dots.
The achievements not only carry out optical filter including negative k thin-films, but also provide a new horizon for conventional thin-film optics.
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