Preparation and properties of Ag plasmonic structures on garnet substrates

Abstract

In this paper technological aspects of preparation of silver nanostructures on garnet substrates and their impact on absorption and photoluminescence have been studied. For this purpose, the changes of plasmonic properties as a function of the Ag NPs preparation features, such as type of substrate material, sputtered silver mass thickness, temperature, and time of thermal treatments were shown. The plasmonic structures were prepared on single-crystalline YAG and GGG garnets as well as amorphous glass substrates by the magnetron sputtering technique. Nucleation and growth of Ag nanoparticles were controlled by a thermal annealing process. Two broad absorption bands peaked at 350-370 nm and 440-650 nm were observed due to quadrupole and dipole modes, respectively, of surface plasmon resonance (SPR) of Ag nanoparticles. Changes of the positions, intensities, and widths of these absorption bands related to the nanoparticle sizes, densities, and shapes are presented. Degradation of the plasmonic structures at ambient conditions, which is revealed as diminishing of the plasmonic absorption bands and associated with sulphidation of Ag nanoparticles in the natural environment, was studied in details. Theoretical simulations of the sulphidation process modelled as coating of Ag nanoparticles with silver sulphide (Ag 2 S) film confirm the experimentally observed diminishing of SPR.

Enhanced luminescence of Si(111) surface by localized surface plasmons of silver islands

“…In order to understand the luminescent properties of the Ag islands on the Si(111) surface, STML measurements are performed on Ag thin film of a thickness of 3 nm on the Si surface and Ag(111) single crystal. The STML spectra on these surfaces in figure 3 appear quite different to each other due to the plasmon resonance wavelength being strongly dependent on the surrounding material [22], while the curve fittings of the spectra demonstrate several distinguishing features. As expected, the absence of the P 1.85 on the spectrum of the Ag single crystal further confirms that this light emission indeed originates from the Si(111) surface.…”

Large-scale and tunable transparent displays based on silver nanoparticles metasurface

“…Firstly, reducing the size distribution of NPs may be valuable in narrowing the mode linewidth. Studying the impact of Ag/dielectric layer thicknesses and annealing parameters on the morphology of the formed NPs would be an efficient way to achieve this [22]. Secondly, the resonance linewidth of dielectric NPs is not limited by absorption losses compared to metals, so replacing Ag NPs with dielectric NPs for enhanced scattering may be a promising direction [36].…”

“…The moderate thermal annealing treatment can transform the Ag films into discrete NPs (Ag NPs metasurface structure). A previous study has demonstrated that both the annealing condition and coating thicknesses of Ag films can affect the morphology and distribution of the formed Ag NPs, which consequently affect the overall resonance performance of the Ag NPs metasurface structures [22]. To simplify, we fix the annealing conditions, so the distribution of the formed Ag NPs is mainly determined by the thickness of the deposited Ag film.…”

“…Fortunately, Gupta et al [20] have reported that truncated nanospheres can be formed by annealing a metal film deposited on a subtrate. Kushlyk et al [21,22] have also demonstrated that the SPR of the formed Ag NPs can be tuned by adjusting the spacer layer, substrate, film thickness, and annealing parameters. This technique of film deposition and thermal annealing has many advantages over the conventional plasmonic NPs preparing methods, such as simple, fast, inexpensive fabrication and high island density without the risk of agglomeration, which provides a new platform to fabricate the metal NPs metasurface for transparent display applications.…”

Super – Fluorescence Quenching of 1-(E)-styryl-2-(4-(2-(E) - styrylphenoxy) Butoxy)Benzene (Alkoxy Bridged Styryl Benzene)(PPPBB) Colloidal Silver and Gold Nanoparticles

“…New methods for investigating the interaction between metallic nanoparticles and excited uorophore were discovered through the rapid development of nanotechnology science over the last decades. The interactions between the metallic nanoparticles with uorophores had a growing interest in recent years [1,2]. The near eld interactions between uorophores and metallic nanoparticles help in modi cation of the uorescence emission [3,4].…”