| Summary: | 博士 === 國立成功大學 === 光電科學與工程學系 === 100 === In this thesis, the Finite-Difference Time-Domain program MEEP is used in our simulation. We theoretically propose five devices and proved it by FDTD simulation. All devices we investigated are composed of periodic or quasi-periodic structures.
First, in the quasi-periodic we designed (1. Waveguide arrays are composed of perforated perfect conductor layer and dielectric layer, 2. Multi-layered fishnet waveguide structure, 3. Composite metal-insulator-metal structure), we have observed the optical Bloch oscillation phenomena at microwave and near-infrared region. Furthermore, we also predict the ray trajectories using Hamiltonian optics when the incident wave is launched into these structures.
Next, the method of phase velocity compensation is used to design multi-layered dielectric cladding on the circumference of an Ag microdisk cavity. SP that is generated by the evanescent coupling of a waveguide mode is tightly confined to the microdisk with very little scattering loss. The proposed devices efficiently perform filter/coupler functions.
Finally, we have demonstrated a hybrid-superlens-hyperlens can be developed by employing two periodic metal-dielectric composites, the upper planar-superlens and the lower cylindrical-hyperlens, with different isofrequency dispersion curves. The proposed hybrid-superlens-hyperlens can not only resolve the subwavelength fine structures but also utilize its anisotropic feature to enhance and transfer the high spatial frequencies to the far field.
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