Nanometer-thick Au-films as antireflection coating for infrared light

Gompf, Bruno; Beister, J.; Brandt, T.; Pflaum, Jens; Dressel, Martin

doi:10.1364/ol.32.001578

Cited by 33 publications

(26 citation statements)

References 13 publications

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“…However, there is restriction related to the percolation threshold. It depends on the method and temperature of growth and varies in a wide range from 1.5 to 10 nm [23][24][25]. For our simulations we have used the safe value of 10 nm as a minimum gold layer thickness.…”

Section: Plasmon Mode Management By Changing the Thickness Of Gold Anmentioning

confidence: 99%

Plasmon Modes Management

2011

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A new plasmonic structure based on bimetallic layer is proposed. We analyze the structure and show that bimetallic film plays a crucial role in the management of surface plasmons. The roll of the buffer is discussed, as well. Up to three surface plasmons can be excited simultaneously in the structure. Two of plasmons can be used for two-plasmon spectroscopy. The third plasmon can be used for controlling the temperature of the structure.

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Section: Plasmon Mode Management By Changing the Thickness Of Gold Anmentioning

confidence: 99%

Plasmon Modes Management

2011

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“…The dielectric function also exhibits a monotonic increase in AC conductivity with wavelength, a clear signature that the film is above the percolation threshold [41,42]. The reported percolation threshold thickness for Au is 6.5nm with no adhesion layer [42,43]. The presence of Ti adhesion layer is expected to reduce the percolation thickness to a smaller value.…”

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confidence: 92%

Near-infrared surface plasmon polariton dispersion control with hyperbolic metamaterials

et al. 2013

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We demonstrate experimentally signatures and dispersion control of surface plasmon polaritons from 1 to 1.8 µm using periodic multilayer metallo-dielectric hyperbolic metamaterials. The fabricated structures are comprised of smooth films with very low metal filling factor. The measured dispersion properties of these hyperbolic metamaterials agree well with calculations using transfer matrix, finite-difference time-domain, and effective medium approximation methods despite using only 2.5 periods. The enhancement factor in the local photonic density of states from the studied samples in the near-infrared wavelength region is determined to be 2.5-3.5. Development of this type of metamaterial is relevant to sub-wavelength imaging, spontaneous emission and thermophotovoltaic applications.

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“…In principle one can try to simulate semi-continues metal films with effective medium (EMA) theories 3,4 . However it was shown that EMA models fail to describe the dielectric properties of ultra-thin metal films 5,6 . In general this transition region was not yet studied in detail over a broad frequency range; nevertheless, these investigations should eventually provide the data to link the abrupt change in dc-conductivity with the observed shift of plasmon resonances in the visible.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of ultrathin metal films around the percolation threshold

2010

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We report on optical reflection measurements of thin Au films at and around the percolation threshold (film thickness 3 to 10 nm) in an extremely broad spectral range from 500 to 35 000 cm −1 (0.3 -20 µm). Combining spectroscopic ellipsometry and Fourier-transform infrared spectroscopy, the dielectric properties of the films can be described over the whole frequency range by Kramers-Kronig consistent effective dielectric functions. The optical conductivity of the films is dominated by two contributions: by a Drude-component starting at the percolation threshold in the low frequency range and a plasmon in the near-infrared region, which shifts down in frequency with increasing film thickness. The interplay of both components leads to a dielectric anomaly in the infrared region with a maximum of the dielectric constant at the insulator-to-metal transition.

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Nanometer-thick Au-films as antireflection coating for infrared light

Cited by 33 publications

References 13 publications

Plasmon Modes Management

Plasmon Modes Management

Near-infrared surface plasmon polariton dispersion control with hyperbolic metamaterials

Dielectric properties of ultrathin metal films around the percolation threshold

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