| Summary: | 碩士 === 國立臺灣大學 === 光電工程學研究所 === 100 === The extraordinary transmission of gold film perforated with paired-shaped aperture array arranged in a rectangle lattice is investigated in theory and experiment. The intensities of higher order SPP modes are found to be much stronger than that of fundamental one. It is demonstrated that the enhanced higher order modes can be generated by various paired apertures as the basis in both symmetric and asymmetric designs, regardless of sizes and shapes. It is proven that the separation between the paired apertures is the key factor to determine which higher order plasmon modes can be enhanced. In addition, transmission properties of random gold nanoparticles embedded inside periodic hole arrays have been studied in the infrared region as well. By using rapid thermal annealing technique, different thickness of gold film result in randomly distributed nanoparticles. Therefore, it significantly enhances the overall transmission of higher order modes in the infrared region. Moreover, the characteristics of metal/insulator/metal (MIM) structured plasmonic thermal emitter (PTE) using periodic hole array with asymmetric paired apertures as top metallic layer are investigated. The significantly enhanced higher order SPP modes in reflectance and emittance spectra are observed. This demonstration of enhanced second order SPP modes in IR thermal emitters gives great promises for second harmonic generation in the mid-infrared region.
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