Localized surface plasmon polaritons in Ag∕SiO2∕Ag plasmonic thermal emitter

Abstract

The reflection dispersion relation and emission spectra of Ag∕SiO2∕Ag trilayer plasmonic thermal emitters with different lattice constant and Ag line width were investigated. The top Ag film is perforated with parallel line-shape hole array. The induced Ag∕SiO2 surface plasmons at both top and bottom Ag∕SiO2 interface are found coupled together. The coupling effect results in the localized surface plasmon polaritons confined at the top Ag∕SiO2 interface which exhibit the Fabry–Pérot resonance. The thermal emission peak position coincides with the reflection minimum in the dispersion relation and shifts to long wavelength as the Ag line width increases, which proves that the emission is due to the excitation of localized surface plasmon polaritons. Moreover, the emitted light is polarized perpendicular to the parallel metal lines.

Narrow bandwidth and highly polarized ratio infrared thermal emitter

“…A plasmonic thermal emitter constructed by metal/ dielectric/metal structure was demonstrated by Tsai et al 3,6,7 Not only SP modes but also waveguide modes ͑WM͒ were observed as the dielectric layer became thicker in the same structure. 7,8 Different from the SP modes, WM exhibited a narrower bandwidth spectrum and the modes will not split with changing observation angle.…”

“…Many schemes have been demonstrated to create a polarized thermal emitter, such as onedimensional ͑1D͒ metallic grating, 3 metallic gutters, 4 and 1D silicide grating. 5 Conventionally, thermal radiation was generated then coupled with the artificial surface structure mediated by surface plasmon ͑SP͒ polariton, 3 or surface phonon polariton. 5 The output power of the device mentioned in the latter was limited by the low emissivity of metal, and it also had a broad bandwidth and low polarized ratio.…”

Wavelength selective plasmonic thermal emitter by polarization utilizing Fabry-Pérot type resonances

“…͑1͒ with the same indices l and m. This phenomenon is quite reasonable since the effective refractive index n ef f of SiO 2 has considerable variances caused by phonon modes in the mid-infrared region. 11 In Fig. 3 the emittance polar plots versus polarization angle of the two fundamental LSP modes in sample with d y of 4 m are shown.…”

Emission Enhancement in Ag/${\rm SiO}_{2}$/Ag Thermal Emitter by Using a Hexagonal Dimple Array

“…Of them the tri-layer Ag/SiO 2 /Ag plasmonic thermal emitter (ASA-PTE) has been demonstrated by Tsai et al [4] for its effectiveness for Bioinfrared light source. The emission optical properties of the ASA-PTE have been theoretically explained by approaches such as the momentum conservation law, dispersion relations of surface plasmon polaritons (SPPs) [1]- [3], SiO 2 thickness effect [5] surface plasmon type [6], lattice type [3], [7] and different dielectric materials on Si and sapphire substrates [7] as well. By extending the results of the above research, this work describes a novel Ag/SiO 2 /Ag structure to enhance the performance of ASA-PTE in areas such as a higher emission intensity and narrower FWHM.…”