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Dramstad TA, Wu Z, Massari AM. Sum frequency generation as a proxy for ellipsometry: Not just a phase. J Chem Phys 2022; 156:110901. [DOI: 10.1063/5.0076252] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Infrared refractive indices of organic materials are typically resolved through IR ellipsometry. This technique takes advantage of optical interference effects to solve the optical constants. These are the same effects that complicate the analysis of coherent spectroscopy experiments on thin films. Vibrational sum frequency generation is an interface-specific coherent spectroscopy that requires spectral modeling to account for optical interference effects to uncover interfacial molecular responses. Here, we explore the possibility of leveraging incident beam geometries and sample thicknesses to simultaneously obtain the molecular responses and refractive indices. Globally fitting a higher number of spectra with a single set of refractive indices increases the fidelity of the fitted parameters. Finally, we test our method on samples with a range of thicknesses and compare the results to those obtained by IR ellipsometry.
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Affiliation(s)
- Thorn A. Dramstad
- University of Minnesota–Twin Cities, 207 Pleasant St. SE, Minneapolis, Minnesota 55454, USA
| | - Zhihao Wu
- University of Minnesota–Twin Cities, 207 Pleasant St. SE, Minneapolis, Minnesota 55454, USA
| | - Aaron M. Massari
- University of Minnesota–Twin Cities, 207 Pleasant St. SE, Minneapolis, Minnesota 55454, USA
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