Electric Fields Produced by the Propagation of Plane Coherent Electromagnetic Radiation in a Stratified Medium

Hansen, Wilford N.

doi:10.1364/josa.58.000380

Cited by 704 publications

(574 citation statements)

References 3 publications

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“…The sign of the vibrational signals on dielectric materials can be explained by the reflectivity calculations described in Refs. [18][19][20][21]29]. The s-polarized light is oriented parallel to the surface and perpendicular to the incidence direction (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Interaction of carboxylic acids with rutile TiO2(110): IR-investigations of terephthalic and benzoic acid adsorbed on a single crystal substrate

Buchholz

Noei

et al. 2016

Surface Science

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a b s t r a c t a r t i c l e i n f oThe adsorption of two carboxylic acids, benzoic acid (BA) and terephthalic acid (TPA), on a single crystal rutile TiO 2 (110) substrate was studied using infrared reflection-absorption spectroscopy (IRRAS) in conjunction with DFT calculations. On the basis of the high-quality IR data (in particular for the OH bands), various adsorbate species with different geometries could be identified. The adsorption of both, BA and TPA, on TiO 2 (110) leads to deprotonation of carboxylic acids and protonation of substrate O-atoms. At low coverage, the deprotonated BA molecule adsorbs on TiO 2 (110) in an upright, bidentate configuration, while the TPA molecule adopts a flatlying geometry with both carboxylates bound to the surface in a monodentate geometry. At higher coverages, a transition from flat-lying to upright-oriented TPA molecules occurs. At saturation coverage, both BA and TPA molecules undergo dimerization indicating the presence of pronounced attractive intermolecular interactions. We propose that the BA dimers are stabilized by the interaction between adjacent phenyl rings, while the TPA dimerization is attributed to the formation of double hydrogen bonds between adjacent apical carboxylic groups.

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Section: Discussionmentioning

confidence: 99%

“…IR-reflectivity and -absorbance calculations were performed by using the equations derived by Hansen et al [18,19] and by Mielczarski et al [20], as described in detail in Ref. [21].…”

Section: Irras Experimentsmentioning

confidence: 99%

Interaction of carboxylic acids with rutile TiO2(110): IR-investigations of terephthalic and benzoic acid adsorbed on a single crystal substrate

Buchholz

Noei

et al. 2016

Surface Science

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“…The experimental requirements mentioned above indicate that before an IR beam is reflected from the mirror surface the light has to travel through a few phases. Each phase has distinct optical constant, and thickness, and is assumed to be non-magnetic, and homogenous, with sharp, infinitely parallel boundaries [52,53]. Figure 1 shows schematically the multilayer system of a spectroelectrochemical cell.…”

Section: Application Of Irras To the Electrochemical Interface: Theormentioning

confidence: 99%

“…The propagation, reflection and attenuation of the IR light in this stratified system are described by the classical electromagnetic light theory [52][53][54]. When an IR beam is incident at a phase boundary between two media (index 1 and 2), a part of the beam is reflected and a part is transmitted into the second phase.…”

Section: Application Of Irras To the Electrochemical Interface: Theormentioning

confidence: 99%

Application of Polarization Modulation Infrared Reflection Absorption Spectrosocpy Under Electrochemical Control for Structural Studies of Biomimetic Assemblies

Brand

2015

Zeitschrift Für Physikalische Chemie

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An ideal bioanalytical method would allow carrying out sensitive, selective, reproducible, fast, and in situ chemical measurements of the composition, structure and function of complex biological systems. Physical chemistry possesses advanced structure analyzing techniques which are suitable to solve, at a sub-molecular level, the structure of biomolecules. However, the prerequisite of the presence of the electrolyte solution limits the number of applicable structure analyzing techniques. Infrared spectroscopy is one of the most powerful analytical techniques used to identify the structure of biomolecules, monitor structural changes under various experimental environments and physical states. In addition, infrared reflection absorption spectroscopy (IRRAS) has been successfully applied to study supramolecular films at the solid|liquid interface. Assemblies of biomolecules belong to a particularly demanding because they bring specific for the maintenance of their functions experimental requirements which have to be taken into account planning in situ spectroelectrochemical experiments. In this paper potnential of in situ IRRAS under electrochemical control for studies of structural changes in assemblies of biomolecules such as lipid bilayers and protein films is described. Studies of different classes of biomolecules bring certain experimetnal conditions concerning the electrolyte composition, pH value, temperature or chemical nature of the solid support, which have to be fulfilled. Obviously, these conditons may significantly restrict the applicability of the in situ PM IRRAS. The selection of the solid substrate with required optical and electrical properties, the optical window and the electrolyte composition have to be adapted to the needs of biomolecules. Adjustement of experimetnal conditions as well as possibilites of the enlargement of the in situ PM IRRAS for studies of biomimetic assemblies is reviewed in this paper. Furthermore, experimetnal resutls reporting potenial driven changes in models of cell membranes and protein films are reviewed. Pioneering studies aiminig at the determination of structural changes in lipid membranes exposed to physiological electric fields and interacting simultaneously with protiens are described.

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“…N-phase Fresnel calculations were used to model reflection and transmission through the multilayer air/ZnPC/silver/BK7 prism system as a function of the wavelength, angle of incidence, and polarization state of the incident light. 26 Scripts were written in MATLAB (The MathWorks, Inc., Natick, MA) to calculate reflection for three-phase (BK7/silver/air) or four-phase (BK7/silver/ZnPC film/air) models. Wavelength-dependent refractive indices of BK7 glass were used in the calculations.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Resonance Quenching and Guided Modes Arising from the Coupling of Surface Plasmons with a Molecular Resonance

2011

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In this paper, we describe experimental and modeling results that illucidate the nature of coupling between surface plasmon polaritons in a thin silver film with the molecular resonance of a zinc phthalocyanine dye film. This coupling leads to several phenomena not generally observed when plasmons are coupled to transparent materials. The increased absorption coefficient near a molecular resonance leads to a discontinuity in the refractive index, which causes branching of the plasmon resonance condition and the appearance of two peaks in the p-polarized reflectance spectrum. A gap exists between these peaks in the region of the spectrum associated with the molecular resonance and reflects quenching of the plasmon wave due to violation of the resonance condition. A second observation is the appearance of a peak in the s-polarized reflection spectra. The initial position of this peak corresponds to where the refractive index of the adsorbate achieves its largest value, which occurs at wavelengths just slightly larger than the maximum in the molecular resonance. Although this peak initially appears to be nondispersive, both experimental data and optical modeling indicate that increasing the film thickness shifts the peak position to longer wavelengths, which implies that this peak is not associated with the molecular resonance but, rather, is dispersive in nature. Indeed, modeling shows that this peak is due to a guided mode in the film, which appears in these conditions due to the abnormally high refractive index of the film near the absorbance maximum. Results also show that, with increasing film thickness, numerous additional guided modes appear and move throughout the visible spectrum for both sand p-polarized light. Notably, these guided modes are also quenched near the location of the molecular resonance. The quenching of both the plasmon resonance and the guided modes can be explained by a large decrease in the in-plane wave propagation length that occurs near the molecular resonance, which is a direct result of the film's large absorption coefficient. ABSTRACT: In this paper, we describe experimental and modeling results that illucidate the nature of coupling between surface plasmon polaritons in a thin silver film with the molecular resonance of a zinc phthalocyanine dye film. This coupling leads to several phenomena not generally observed when plasmons are coupled to transparent materials. The increased absorption coefficient near a molecular resonance leads to a discontinuity in the refractive index, which causes branching of the plasmon resonance condition and the appearance of two peaks in the p-polarized reflectance spectrum. A gap exists between these peaks in the region of the spectrum associated with the molecular resonance and reflects quenching of the plasmon wave due to violation of the resonance condition. A second observation is the appearance of a peak in the s-polarized reflection spectra. The initial position of this peak corresponds to where the refractive index of the adsorbate ac...

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Electric Fields Produced by the Propagation of Plane Coherent Electromagnetic Radiation in a Stratified Medium

Cited by 704 publications

References 3 publications

Interaction of carboxylic acids with rutile TiO2(110): IR-investigations of terephthalic and benzoic acid adsorbed on a single crystal substrate

Interaction of carboxylic acids with rutile TiO2(110): IR-investigations of terephthalic and benzoic acid adsorbed on a single crystal substrate

Application of Polarization Modulation Infrared Reflection Absorption Spectrosocpy Under Electrochemical Control for Structural Studies of Biomimetic Assemblies

Resonance Quenching and Guided Modes Arising from the Coupling of Surface Plasmons with a Molecular Resonance

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