| Summary: | 博士 === 國立臺灣大學 === 應用物理所 === 102 === Plasmonic metamaterials is a novel research field in nanophotonics. It focuses on the resonant behaviors of the coherent oscillation of free electrons in metallic nano-particles (so-called plasmonic resonance) and the applications of light-matter interactions at plasmonic resonances.
I sincerely hope that this thesis recorded not only the research results during my Ph.D program, but also provided a useful guideline for those who are interested in plasmonic metamaterials. In the 1st Chapter, the background of electromagnetic theory related to noble metals are introduced. Chapter 2 focuses on the historical development of surface/localized plasmons, metamaterials and metasurfaces. In Chapter 3, the fabrication of metamaterials and the detection as well as characterization of plasmonic resonant modes are described. From Chapter 4 to Chapter 6, I describe how the reflected plasmonic metasurfaces can be applied to demonstrate metadevices with functionalities that cannot be achieved by conventional optical devices.
Plasmonic metasurfaces are composited by sub-wavelength structures to control the phase of electromagnetic wave. Once we can freely control the phase of electromagnetic wave, the demonstration of many metadevices with novel optical properties becomes possible. We proposed and demonstrated two metadevices: meta-hologram and meta-analyzer for detection of linearly, right or left circularly polarized light. The reconstructed images of conventional holograms are not sensitive to the polarization state of incident light. On the contrary, the reconstructed images of meta-hologram show polarization-controlled dual images, functioning for both coherent and incoherent light sources within a broad spectral range and under a wide range of incidence angles. Analysis of the polarization state of a given electromagnetic wave is less efficient. The Meta-analyzer has the function to separate right-handed and left-handed circular polarization into different angle from normal. We can therefore detect the intensity of the separated light to determine the polarization state. For example, the electromagnetic wave is linearly polarized if there are two spots with the same intensity on detector.
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