Single‐Crystalline Silver Films for Plasmonics

Park, Jong Hyuk; Ambwani, Palak; Manno, Michael; Lindquist, Nathan C.; Nagpal, Prashant; Oh, Sang‐Hyun; Leighton, Chris; Norris, David J.

doi:10.1002/adma.201200812

Cited by 125 publications

(139 citation statements)

References 45 publications

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“…Morphology influences on silver have also been observed with increased τ on smoother silver surface. [29,47] Measurements on single crystal result in a larger τ than on polycrystalline sample. [47] As our measurements have been performed under ambient conditions, surface oxidation is unavoidable despite great care on handling the sample.…”

Section: Comparison Of Drude Parameters With Literature Valuesmentioning

confidence: 99%

“…[26] In their work, contour plots of the reflectance and transmittance were used to determine the complex index of refractionñ(ω) = n(ω) + ik(ω). [29,47] Large inconsistencies between the different measurements exist and were noted early, and suggested to be due to sample contamination [48,49], differences in surface morphologies [50,51], strain [44,52], and the different measurement techniques. [16] Some data even appear unphysical with noted anomalies such as a broad peak in the reflectance spectrum at 5 µm.…”

Section: Past Measurements Of Dielectric Functionmentioning

confidence: 99%

“…[29,47] Measurements on single crystal result in a larger τ than on polycrystalline sample. [47] As our measurements have been performed under ambient conditions, surface oxidation is unavoidable despite great care on handling the sample. Despite numerous studies, a quantitative correlation between sample extrinsic effects and τ has not yet been performed.…”

Section: Comparison Of Drude Parameters With Literature Valuesmentioning

confidence: 99%

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Optical dielectric function of silver

et al. 2015

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The dielectric function of silver is a fundamental quantity related to its electronic structure and describes its optical properties. However, results published over the past six decades are in part inconsistent and exhibit significant discrepancies. The measurement is experimentally challenging with the values of dielectric function spanning over five orders of magnitude from the mid-infrared to the visible/ultraviolet spectral range. Using broadband spectroscopic ellipsometry, we determine the complex valued dielectric function of evaporated and template stripped polycrystalline silver films from 0.05 eV (λ = 25 µm) to 4.14 eV (λ = 300 nm) with a statistical uncertainty of less than 1%. From Drude analysis of the 0.1 -3 eV range, values of the plasma frequency ω p = 8.9 ± 0.2 eV, dielectric function at infinite frequency ∞ = 5 ± 2, and relaxation time τ = 1/Γ = 17 ± 3 fs are obtained, with the absolute uncertainties estimated from systematic errors and experimental repeatability. Further analysis based on the extended Drude model reveals an increase in τ with decreasing frequency in agreement with Fermi liquid theory, and extrapolates to τ 22 fs for zero frequency. A deviation from simple Fermi liquid behavior is suggested at energies below 0.1 eV (λ = 12 µm) with the onset of a further increase in τ connecting to the DC value from transport measurements of ∼ 40 fs. The results are consistent with a wide range of optical and plasmonic experiments throughout the infrared and visible/ultraviolet spectral range. The influence of grain boundaries, defect scattering, and surface oxidation is discussed. The results are compared with our previous measurements of the dielectric function of gold [Phys. Rev. B 86, 235147 (2012)].

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Section: Comparison Of Drude Parameters With Literature Valuesmentioning

confidence: 99%

Section: Past Measurements Of Dielectric Functionmentioning

confidence: 99%

Section: Comparison Of Drude Parameters With Literature Valuesmentioning

confidence: 99%

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Optical dielectric function of silver

et al. 2015

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“…Introduction T he possibility of having 10 nm layers of metal on a substrate is a research topic widely studied [1,2,3]. It would be useful in several applications such as of plasmonic waveguides [4] or hyperbolic metamaterials [5]. Ultrathin, ultrasmooth metal layer on dielectrics can allow us to increase the band of use of hyperbolic meta-materials and can highly increase propagation of surface plasmon polaritons (SPPs) through the structure [6,7], thus bringing this field closer to the large-scale implementation level.…”

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confidence: 99%

Ultrathin, Ultrasmooth Gold Layer on Dielectrics without the Use of Additional Metallic Adhesion Layers

Leandro

Malureanu

Rozlosnik³

et al. 2015

ACS Appl. Mater. Interfaces

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With the advance in the plasmonics and metamaterials research field, it became more and more important to fabricate, thin and smooth Au metal films in a reliable way. Here, by thin films we mean that their average is height below 10 nm and their average roughness is below 5% of the total thickness. In this article, we investigated the use of amino-and mercapto-silanes to increase the adhesion of Au on Si wafers thus obtaining a smooth and thin layer. This method do not include the uses of other metals to improve the adhesion of gold, like Ti or Cr, since they would reduce the optical characteristics of the structure. Our results show that layers having 6 nm thickness and below 0.3 nm roughness can be reproducibly obtained using amino-silanes. Layers having a nominal thickness of 5 nm have a yield of 50% thus this thickness is the limit for the process that we investigated.

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“…Another big advantage of this technique is the use of glass as a substrate, thus, making samples readily available for visible and IR plasmonics. Using DC magnetron sputtering [70], one can obtain monocrystalline silver layers; however, the substrate has to be lattice matched. In the reference, mica is used as the substrate, making silver films unapt for visible/IR plasmonics.…”

Section: Silver Thin Filmsmentioning

confidence: 99%

Ultra-thin films for plasmonics: a technology overview

Malureanu

Lavrinenko

2015

Nanotechnology Reviews

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Ultra-thin films with low surface roughness that support surface plasmon-polaritons in the infra-red and visible ranges are needed in order to improve the performance of devices based on the manipulation of plasmon propagation. Increasing amount of efforts is made in order not only to improve the quality of the deposited layers but also to diminish their thickness and to find new materials that could be used in this field. In this review, we consider various thin films used in the field of plasmonics and metamaterials in the visible and IR range. We focus our presentation on technological issues of their deposition and reported characterization of film plasmonic performance.

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Single‐Crystalline Silver Films for Plasmonics

Cited by 125 publications

References 45 publications

Optical dielectric function of silver

Optical dielectric function of silver

Ultrathin, Ultrasmooth Gold Layer on Dielectrics without the Use of Additional Metallic Adhesion Layers

Ultra-thin films for plasmonics: a technology overview

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