Optical and structural properties of Au-Ag islands films for plasmonic applications

Sancho‐Parramon, Jordi; Janicki, Vesna; Lončarić, Martin; Zorc, Hrvoje; Dubček, Pavo; Bernstorff, Sigrid

doi:10.1007/s00339-010-6231-x

Cited by 16 publications

(16 citation statements)

References 12 publications

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“…The resulting LSPR frequency typically lies between that of the two pure components, depending on the relative amounts of the two components. To date, several types of bimetallic nanoparticles have been synthesized [9][10][11]. In particlular, the combinations of Au and Ag are interesting because of their composition-sensitive optical properties.…”

Section: Introductionmentioning

confidence: 99%

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Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals

Meng

Shibayama

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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Effects of Ar-ion induced surface nanostructuring were studied using 100 keV Ar-ion irradiation of 30 nm Ag-Au bimetallic films deposited on Al 2 O 3 single crystals, under irradiation fluences ranging from 5.0 × 10 15 cm -2 to 6.3 × 10 16 cm -2 . Scanning electron microscope was used to study the ionbeam-induced surface nanostructuring. As the irradiation fluence increased, dewetting of the bimetallic films on the Al 2 O 3 substrate was observed, and formation of isolated Ag-Au nanostructures sustained on the substrate were obtained. Next, thermal annealing was performed under high vacuum at 1073 K for 2 hours; a layer of photosensitive Ag-Au alloy nanoballs partially embedded in the Al 2 O 3 substrate was obtained when higher fluence irradiation (> 3.8 × 10 16 cm -2 ) was used. The microstructures of the nanoballs were investigated using a transmission electron microscope, and the nanoballs were found to be single crystals with a FCC structure. In addition, photoabsorption spectra were measured, and localized surface plasmon resonance peaks were observed. With increase in the irradiation fluence, the size of the Ag-Au nanoballs on the substrate decreased, and a blue-shift of the LSPR peaks was observed. Further control of the LSPR frequency over a wide range was achieved by modifying the chemical components, and a red-shift of the LSPR peaks was observed as the Au concentration increased. In summary, ion irradiation is an effective approach toward surface nanostructuring, and the nanocomposites obtained have potential applications in optical devices.

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Section: Introductionmentioning

confidence: 99%

“…Here we report a remarkable "ion irradiation and subsequent annealing" technique, which is a top-down approach in comparison to chemical methods [10,11]. Previously, we have synthesized single-layer gold nanoballs with a narrowed size distribution which were partially embedded in SiO 2 glass [22].…”

Section: Introductionmentioning

confidence: 99%

Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals

Meng

Shibayama

et al. 2013

Nuclear Instruments and Methods in Physics Research Section B:

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“…To improve the performance of such a coating, it is necessary to optimize the thicknesses of the SiO 2 layers and get the maximum benefit from interference. The symmetric gradient coating has been modeled in TFCalc software, with the same material properties and effective thicknesses of metal island films as the deposited one [7]. The thicknesses of the dielectric layers were initially set to values of quarterwaves covering a range of 350-580 nm, changing gradually through the coating.…”

Section: Resultsmentioning

confidence: 99%

“…They are used in selective absorbers, optical polarizers, and data storage [2][3][4], or in chemical and biological sensing and surface enhanced spectroscopy [5,6]. Combining two metals, in the shape of an alloy or core-shell nanoparticles, it is possible to shift the absorption peak in an even wider range of wavelengths than when using one metal only [7]. The position of the absorption peak of the SPR depends also on the dielectric constant of the surrounding media [8].…”

Section: Introductionmentioning

confidence: 99%

Gradient silver nanoparticle layers in absorbing coatings—experimental study

2010

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Metal island films show a characteristic absorption peak related to the surface plasmon resonance of free electrons. This kind of film can be used in absorbing coatings, together with dielectric layers. Such absorbing multilayer coatings, with and without the gradient of the silver mass thickness in metal island films throughout the coating, have been deposited by electron beam evaporation. It is shown experimentally that coatings with a gradient in the mass thickness of silver nanoparticles have higher absorption than equivalent nongradient coatings with the same total mass thickness of silver nanoparticles.

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“…This route has been used to grow metaldielectric nanocomposite films and control their optical properties. 9,14,25,[30][31][32] However, in order to fine-tune the plasmonic response and fully exploit the potential of metal-ceramic nanocomposite films, multiple-step synthesis processes in which film deposition followed by post-deposition treatment by thermal or laser annealing are commonly employed 19,23,[33][34][35][36][37] . Besides the associated technical complexity, these processes are not compatible with e.g., thermally sensitive (e.g., organic) substrates limiting the application reach of plasmonics film within the realm hard inorganic materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of tunable plasmonic metal-ceramic nanocomposite thin films by temporally modulated sputtered fluxes

Magnfält

Melander

Boyd

et al. 2017

Journal of Applied Physics

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The scientific and technological interest for metal-dielectric nanocomposite thin films emanates from the excitation of localized surface plasmon resonances (LSPRs) on the metal component. The overall optical response of the nanocomposite is governed by the refractive index of the dielectric matrix and the properties of the metallic nanoparticles in terms of their bulk optical properties, size, and shape, and the inter-particle distance of separation. In order to tune the film morphology and optical properties, complex synthesis processes which include multiple steps-i. e., film deposition followed by post-deposition treatment by thermal or laser annealing-are commonly employed. In the present study, we demonstrate that the absorption resonances of Ag/AlOxNy nanocomposite films can be effectively tuned from green (similar to 2.4 eV) to violet (similar to 2.8 eV) using a single-step synthesis process that is based on modulating the arrival pattern of film forming species with sub-monolayer resolution, while keeping the amount of Ag in the films constant. Our data indicate that the optical response of the films is the result of LSPRs on isolated Ag nanoparticles that are seemingly shifted by dipolar interactions between neighboring particles. The synthesis strategy presented may be of relevance for enabling integration of plasmonic nanocomposite films on thermally sensitive substrates. Published by AIP Publishing.

Funding Agencies|LiU Research Fellows Program; LiU Career [Dnr-LiU-2015-01510]; Knut and Alice Wallenberg foundation [2015.0060]

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Optical and structural properties of Au-Ag islands films for plasmonic applications

Cited by 16 publications

References 12 publications

Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals

Shift of localized surface plasmon resonance by Ar-ion irradiation of Ag–Au bimetallic films deposited on Al2O3 single crystals

Gradient silver nanoparticle layers in absorbing coatings—experimental study

Synthesis of tunable plasmonic metal-ceramic nanocomposite thin films by temporally modulated sputtered fluxes

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