Vibrational sum frequency spectroscopy of thin film interfaces

We describe a basic theoretical treatment of how film–substrate and substrate–environment (air, water, and solution) interfaces can be selectively probed by controlling the film thickness and beam angles in a visible-infrared sum frequency generation experiment. In this model, we also account for th...

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Bibliographic Details
Published inBiointerphases Vol. 17; no. 5; p. 051202
Main Authors Moloney, Erin G., Azam, Md. S., Cai, Canyu, Hore, Dennis K.
Format Journal Article
LanguageEnglish
Published 01.09.2022
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Summary:We describe a basic theoretical treatment of how film–substrate and substrate–environment (air, water, and solution) interfaces can be selectively probed by controlling the film thickness and beam angles in a visible-infrared sum frequency generation experiment. In this model, we also account for the unique interfacial environment that may have optical properties that differ from the adjacent bulk phases. We see that this affects components of the electric field that are perpendicular to the surface such as when p-polarized light is used. We then provide an example using the glass–polydimethylsiloxane–air system and model the fields at both surfaces of the polymer. This is followed by some practical considerations for setting up such experiments and some typical experimental results.
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ISSN:1934-8630
1559-4106
DOI:10.1116/6.0002085