Absolute Measurement of the Far-Infrared Surface Resistance of Pb

Brändli, G.; Sievers, A. J.

doi:10.1103/physrevb.5.3550

Cited by 101 publications

(30 citation statements)

References 17 publications

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“…[33,[79][80][81] At frequencies much higher than the Debye frequency (∼ 0.01 eV), the interaction averages over all the phonon modes resulting in a constant effective collision time with negligible frequency dependence. [82,83] The contribution from electron-electron scattering has been derived as [33,84] …”

Section: Comparison Of Drude Parameters With Literature Valuesmentioning

confidence: 99%

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%

Optical dielectric function of silver

et al. 2015

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“…Using the spatial dispersion model, we obtained a value for the excess conduction loss factor of sd . [14] . Table 4 is comparison of Brandli's experiment data and three models predictions excess conduction loss factor for gold.…”

Section: Resultsmentioning

confidence: 95%

“…other sources [10][11] . The results for silver, gold and aluminium are shown in Table 2-Table 5, including the results from the classical skin-effect model and the classical relaxation-effect model [11,14] Parameter Metal Table 2 shows excess conduction loss factor for silver below sub-millimeter wavelengths range (32 m 26 m ). An extracted measurement value of surface resistance was given by Bennett et al [13] .…”

Section: Resultsmentioning

confidence: 99%

Study on Excess Conduction Loss in Normal Metals at/Below Sub-Millimeter Wavelengths

Pan

Zhang

2006

Int J Infrared Milli Waves

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We have used the spatial dispersion theory to develop a rigorous model to investigate excess conduction loss in normal metals. We have used the model to account excess conduction loss and dissect the discrepancies between excess conduction loss measurements and classical theoretical predictions in normal metals at/below sub-millimeter wavelengths. Moreover, we have compared the results of this model with the results of the classical skin-effect model and classical relaxation-effect model. Our analysis shows that the conductivity is not only frequency but also wave vector dependent. The results of the calculations indicate a good quantitative agreement with the published experimental data for the room temperature excess conduction loss of normal metals at/below sub-millimeter wavelengths.

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“…This is generally attributed to increasing sensitivity to enhanced electron scattering from surface microroughness 41,150,151 as the skin depths become smaller than one micron, ␦ Ͻ 1 m. In the THz regime, however, there are only sparse experimental data attempting to measure the pure material intrinsic rf conductivity and the results are in significant disagreement. [152][153][154][155] For example, the question of whether the intrinsic conductivity is anomalously smaller than or simply equivalent to the classical value at THz frequencies is a topic of current controversy, with experimental and theoretical data and arguments supporting both views. [152][153][154][155][156][157][158][159] There have been attempts to develop analytic theories for the intrinsic surface resistance, but they all necessarily make simplifying assumptions.…”

Section: Summary and Remaining Challengesmentioning

confidence: 99%

Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave generation

2008

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Homeland security and military defense technology considerations have stimulated intense interest in mobile, high power sources of millimeter-wave (mmw) to terahertz (THz) regime electromagnetic radiation, from 0.1 to 10THz. While vacuum electronic sources are a natural choice for high power, the challenges have yet to be completely met for applications including noninvasive sensing of concealed weapons and dangerous agents, high-data-rate communications, high resolution radar, next generation acceleration drivers, and analysis of fluids and condensed matter. The compact size requirements for many of these high frequency sources require miniscule, microfabricated slow wave circuits. This necessitates electron beams with tiny transverse dimensions and potentially very high current densities for adequate gain. Thus, an emerging family of microfabricated, vacuum electronic devices share many of the same plasma physics challenges that are currently confronting “classic” high power microwave (HPM) generators including long-life bright electron beam sources, intense beam transport, parasitic mode excitation, energetic electron interaction with surfaces, and rf air breakdown at output windows. The contemporary plasma physics and other related issues of compact, high power mmw-to-THz sources are compared and contrasted to those of HPM generation, and future research challenges and opportunities are discussed.

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Absolute Measurement of the Far-Infrared Surface Resistance of Pb

Cited by 101 publications

References 17 publications

Optical dielectric function of silver

Optical dielectric function of silver

Study on Excess Conduction Loss in Normal Metals at/Below Sub-Millimeter Wavelengths

Plasma physics and related challenges of millimeter-wave-to-terahertz and high power microwave generation

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