Effects of Hole Shapes on Transmission Properties of Metal/Dielectric Structures with Perforated Top Metals and Their Applications to Infrared Thermal Emitters and Optical Filter Devices
Date Issued
2010
Date
2010
Author(s)
Jiang, Yu-Wei
Abstract
The extraordinary transmission through silver film perforated with rectangular hole array with different aspect ratio is investigated. The propagating surface plasmon polaritons (SPPs) is observed to transform to localized resonance mode when the aspect ratio exceeds 7. The role of the Wood’s anomaly on the shape of the transmission spectrum is also investigated. The transmission peak of the localized resonance is fitted quite well with the theoretical calculation using a simplified transmission-line model. Additionally, the emission spectra of Ag/SiO2/Ag tri-layer plasmonic thermal emitters are investigated. Comparison of the emission spectra of the thermal emitters with SiO2 layers having different thicknesses, it is found that the thermal emission can be enhanced when the SiO2 layers is thin. The results suggested that the surface plasmon (SP) leak and store in the intermediate SiO2 layer between two metal layers that will enhance the absorption in the tri-layer structure. The various narrow bandwidth infrared light sources are reported. The suitably designed trilayer Ag/SiO2/Au thermal emitter with thick SiO2 layer supports the waveguide mode (WM) and can be used as the narrow bandwidth infrared light source. This study investigates the influence of dielectric thickness on the energy dispersion relations of SPs and waveguide modes and derives the theoretical dispersion relation, which fit well with experimental results. By shortening the lattice constant, the pure emitted peaks with ultra-narrowband can be obtained, the optimum quality factor approaches to 33. Additionally, we demonstrate that a periodic metallic wavy-structure can be easily fabricated on elastomeric polydymethylsiloxane (PDMS) substrates. The period of the wavy-structure is controllable by varing the thickness of the deposited silver film. The elastomeric-gratings can excite surface plasmon on Ag/air interfaces, the resonant wavelength can be tuned to a range of 3.5% by applying an external mechanical strain. Our experiments demonstrate the possibility of a new type optical filter with tunable wavelengths.
Subjects
extraordinary transmission
surface plasmon polaritons
thermal radiation
waveguide mode
quality factor
polydymethylsiloxane
optical filter device
Type
thesis
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