Surface plasmon polariton radiation from silver films on fluoride films and surface roughness parameters of those silver films

Attenuated total reflection and rear-side light emission were measured on 50 nm thick gold films evaporated on glass substrates previously coated with LiF layers of 0-500 nm thickness. The complex dielectric constant of metal films was determined as a function of the fluoride thickness. Roughness parameters (σ, δ) were calculated from the angular distribution of the emission intensity and also from atomic force microscope images. Roughness amplitudes (δ) were found to be proportional to the fluoride thickness up to 350 nm, but over this value began to decrease. Both the average grain diameter and the correlation length (σ ) increased with the layer thickness in the whole observed range, indicating the flattening out of LiF at large thicknesses. Dielectric functions and surface plasmon wave-vectors of gold layers change drastically under the influence of increasing roughness amplitudes, which effect cannot be quantitatively described by the unmodified Fresnel equations.

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“…Similar σ parameters were found with an analogous experimental technique for silver covered LiF samples of d(LiF) 200 nm thickness [7].…”

Section: Light Emission Measurementssupporting

confidence: 83%

Effect of roughness on surface plasmon scattering in gold films

Hoffmann

Lenkefi

Szentirmay

1998

J. Phys.: Condens. Matter

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“…The transversal correlation length is denoted by o and the depth of corrugation or average height by 5 with 2 the mean square deviation from a plane surface. For small cS 20 A values for 6 and o may be determined via the efficiency of surface plasmon coupling in an attenuated total reflection (ATR) geometry [18,19]. For larger depths of corrugation scanning microscopy [20] is a more reliable method.…”

Section: Isolated Atoms Near Rough and Smooth Surfacesmentioning

confidence: 99%

<title>Influence of surface roughness on frequency shift and third-order nonlinear susceptibility of adsorbed particles</title>

Balzer

Rubahn

1995

SPIE Proceedings

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In this work we present experimental data that show that the roughness of a metal surface strongly influences the metal induced optical transition frequency shift of alkali atoms that are adsorbed close (a few tens of Angstroms) to the metal. The metal induced changes of electronic lifetime depend on distance d4, suggesting surface electron hole pair excitation to be the dominant relaxation mechanism for electronically excited Na atoms at distances between 24 and 32 A from a rough Au surface. The nonlinear response of metal surfaces is also well known to be enhanced by surface roughness. It has been anticipated that this enhancement should be most pronounced for a third order nonlinear optical process. Here, we present data of strong enhancement of x1 for rough metal surfaces. The surfaces consist of large alkali metal clusters, adsorbed on dielectrics. By changing the cluster size distribution we are able to study the third order nonlinearity as a function of shape of the alkali protrusions.

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“…This value is low but has been shown to be highly dependent on exposure to air and attributable to device degradation. [83] However, in absorption limited devices, the thickness of the active absorbing layers can be made thinner, which has previously been shown to signicantly increase η IQE by increasing the probability of exciton dissociation at the active interface [82]. Active semiconductor layers with thicknesses greater than the exciton diusion length lowers dissociation eciency.…”

Section: Energy Transfer Via Guided Modesmentioning

confidence: 99%

“…The correlation between surface roughness and directional light emission has been measured by several authors. [80,81,82] If we assume that the modeled η ABS provides an accurate prediction of absorption versus θ i , η IQE is estimated to be ∼ 20%. This value is low but has been shown to be highly dependent on exposure to air and attributable to device degradation.…”

Section: Energy Transfer Via Guided Modesmentioning

confidence: 99%

The Application of Photosynthetic Materials and Architectures to Solar Cells

Mapel

Baldo

2006

Nanostructured Materials for Solar Energy Conversion

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Photosynthetic approaches to redesigning photovoltaics (PV) oer an attractive route towards achieving high-eciency, low-cost solar energy transduction. This thesis explores two routes toward this end: the direct integration of photosynthetic structures into solid-state devices and the architectural redesign of organic solar cells to more closely parallel photosynthesis.The highly ecient photosynthetic reaction center is the site of exciton dissociation in photosynthesis, analogous to the role of the donor-acceptor interface in organic PV. This thesis describes the successful integration of reaction centers with organic semiconductors into solid-state devices. Although functional, we nd that these devices suer the same limitation as the more traditional organic PV: the ability to absorb enough light.Photosynthetic bacteria and plants compartmentalize the processes leading to light energy conversion. This spatial separation of structures augments the evolutionary design space: the processes of photon absorption and exciton dissociation occur in two separate locations, allowing the independent functional optimization of each. Applying a similar approach to PV would similarly remove the need for multifunctional materials, bypassing limiting tradeos and permitting the utilization of new material systems. To this end, I propose a novel architecture and present initial conclusions on theoretical performance eciency. Fabricated devices demonstrate the system is viable and suggests that further improvements in device design will enable highly ecient photovoltaics.

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Surface plasmon polariton radiation from silver films on fluoride films and surface roughness parameters of those silver films

Cited by 4 publications

References 23 publications

Effect of roughness on surface plasmon scattering in gold films

Effect of roughness on surface plasmon scattering in gold films

<title>Influence of surface roughness on frequency shift and third-order nonlinear susceptibility of adsorbed particles</title>

The Application of Photosynthetic Materials and Architectures to Solar Cells

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