The Studies of Extraordinary Transmission of Periodic Bowtie-shaped Aperture Array and the Wavelength-selective Multi-Spectral IR Thermal Emitters
Date Issued
2011
Date
2011
Author(s)
Huang, Shao-Yu
Abstract
The extraordinary transmission through a silver film perforated with bowtie-shaped aperture array arranged in a rectangle lattice is investigated in theory and experiment. It is found that the second order Ag/Si modes have stronger transmission intensity than the fundamental one, which can be ascribed to the magnetic enhancement between the triangular tips. By increasing the tip separation, tip angle or the metallic film thickness, the enhancement effect of the second order modes vanishes gradually. In addition, the characteristics of the plasmonic thermal emitter (PTE) in metal/dielectric/metal (MIM) structure using parallelogram metallic islands as top layer have been studied. Different from square or rectangular metallic islands, two localized surface plasmon (LSP) modes are observed and their polarizations are dependent on the geometry of the pattern. One has the polarization close to the long diagonal while the other one resonant along the short side. Moreover, when using a block pattern as top structure in the PTE, three peaks can be observed in the emission spectra. These modes can be selected roughly by an external polarizer. By adjusting the lengths of the rectangles in the block pattern, an active IR source with the desired wavelengths can be fabricated.
Subjects
Plasmonics
Extraordinary transmission
Thermal emitter
Type
thesis
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