Influence of the surface roughness on the properties of Au films measured by surface plasmon resonance and X-ray reflectometry

Velinov, T.; Ahtapodov, Lyubomir; Nelson, Andrew; Gateshki, Milen; Bivolarska, Maria

doi:10.1016/j.tsf.2010.10.059

Cited by 12 publications

(12 citation statements)

References 14 publications

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“…All of them display characteristic features with the minimum reflectance around 45.5°, indicating the excitation of SPR. These SPR curves can be well fitted by treating Au film as a homogenous layer with adjustable index[55][56][57][58]. The obtained refractive index (RI) of the Au films are included in the figures, they are close to each other and fall within the typical index range of Au[58][59][60], indicating a successful modeling of Au film SPR.…”

mentioning

confidence: 62%

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Alam

Niu

Wang

et al. 2020

Phys. Rev. Research

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Despite successful modeling of graphene as a 0.34-nm thick optical film synthesized by exfoliation or chemical vapor deposition (CVD), graphene induced shift of surface plasmon resonance (SPR) of gold films has remained controversial. Here we report the resolution of this controversy by developing a clean CVD graphene transfer method and extending Maxwell-Garnet effective medium theory (EMT) to 2D materials. A SPR shift of 0.24º is obtained and it agrees well with 2D EMT in which wrinkled graphene is treated as a 3-nm graphene/air layered composite, in agreement with the average roughness measured by atomic force microscope. Because the anisotropic built-in boundary condition of 2D EMT is compatible with graphene's optical anisotropy, graphene can be modelled as a film thicker than 0.34-nm without changing its optical property; however, its actual roughness, i.e., effective thickness will significantly alter its response to strong out-of-plane fields, leading to a larger SPR shift.

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mentioning

confidence: 62%

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Alam

Niu

Wang

et al. 2020

Phys. Rev. Research

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“…However, the peak-to-valley surface roughness can reach a value of 10 nm (average height of ~ 4.3 nm) for the same scan area (Supplementary Data, Fig. S2), which can cause multiple light scattering effects from the arbitrarily rough surface (Raether 1988) and thus affect the sensitivity (Velinov et al 2010). …”

Section: Resultsmentioning

confidence: 99%

Sensitivity comparison of surface plasmon resonance and plasmon-waveguide resonance biosensors

Abbas

Linman

Cheng

2011

Sensors and Actuators B: Chemical

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Plasmon-waveguide resonance (PWR) sensors are particularly useful for investigation of biomolecular interactions with or within lipid bilayer membranes. Many studies demonstrated their ability to provide unique qualitative information, but the evaluation of their sensitivity as compared to other surface plasmon resonance (SPR) sensors has not been broadly investigated. We report here a comprehensive sensitivity comparison of SPR and PWR biosensors for the p-polarized light component. The sensitivity of five different biosensor designs to changes in refractive index, thickness and mass are determined and discussed. Although numerical simulations show an increase of the electric field intensity by 30–35 % and the penetration depth by four times in PWR, the waveguide-based method is 0.5 to 8 fold less sensitive than conventional SPR in all considered analytical parameters. The experimental results also suggest that the increase in the penetration depth in PWR is made at the expense of the surface sensitivity. The physical and structural reasons for PWR sensor limitations are discussed and a general viewpoint for designing more efficient SPR sensors based on dielectric slab waveguides is provided.

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“…The period of the reflectivity oscillations ("Q z ) indicates the thickness of the layer (t), while the "Q z value is defined as "Q z µ 2³/t. 19) Because the "Q z value of the type-A sample was larger than that of the type-B sample, the thickness of the SiO 2 layer in the type-A sample was determined to be lower than that of the SiO 2 layer in the type-B sample. The critical wave vector for the total external reflection (Q c ), which is defined as Q c = 4(³μ) 1/2 (μ represents the SLD), 20) was observed around Q z = 0.01 (¡…”

Section: Neutron Reflectivity Analysis Of Sio 2 (Phps)/simentioning

confidence: 99%

Investigation of structure of a thin SiO<sub>2</sub> layer as an antifouling and corrosion-resistant coating

Akutsu

Niizeki

Nagayama

et al. 2016

J. Ceram. Soc. Japan

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The structures of a SiO 2 layers synthesized using perhydropolysilazane [PHPS, labeled as SiO 2 (PHPS)] on both Si and Fe/Si substrates were studied using Fourier transform infrared spectroscopy (FT-IR) and neutron reflectivity (NR) analysis. The FT-IR results revealed that no unreacted PHPS remained and that the primary component of the SiO 2 (PHPS) layer could be considered to be SiO 2 . The NR analysis suggested that a uniform SiO 2 (PHPS) layer was synthesized on the Si and Fe/Si substrate and that the density of this SiO 2 (PHPS)layer was lower than that of natural SiO 2 . In addition, the density of the SiO 2 (PHPS) layer was altered by varying both the thickness and the type of substrate used. These results indicated that the variation in the density of the SiO 2 (PHPS) layer depended on the efficiency of cross-linking reaction between the silazane oligomers in the PHPS coating.

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Influence of the surface roughness on the properties of Au films measured by surface plasmon resonance and X-ray reflectometry

Cited by 12 publications

References 14 publications

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Large graphene-induced shift of surface-plasmon resonances of gold films: Effective-medium theory for atomically thin materials

Sensitivity comparison of surface plasmon resonance and plasmon-waveguide resonance biosensors

Investigation of structure of a thin SiO<sub>2</sub> layer as an antifouling and corrosion-resistant coating

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