Quantum State Absorptions Coupled To Resonance Raman Spectroscopy Could Result In A General Explanation of TERS

Zachary D. Schultz; John Parthenios; Rimma Dekhter; Dimitris Anestopoulos; Spyridon Grammatikopoulos; Kostantinos Papagelis; James M. Marr; David Lewis; Costas Galiotis; Dimtry Lev; Aaron Lewis

arXiv · 1608.04134

Quantum State Absorptions Coupled To Resonance Raman Spectroscopy Could Result In A General Explanation of TERS

Zachary D. Schultz·John Parthenios·Rimma Dekhter·Dimitris Anestopoulos·Spyridon Grammatikopoulos·Kostantinos Papagelis·James M. Marr·David Lewis·Costas Galiotis·Dimtry Lev·Aaron Lewis

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Abstract

Tip enhanced Raman scattering (TERS) amplifies the intensity of vibrational Raman scattering by employing the tip of a probe interacting, in ultra close proximity, with a surface. Although a general understanding of the TERS process is still to be fully elucidated, scanning tunneling microscopy (STM) feedback is often applied with success in TERS to keep a noble metal probe in intimate proximity with a noble metal substrate. Since such STM TERS is a common modality, the possible implications of plasmonic fields that may be induced by the tunneling process are investigated and reported. In addition, TERS of a 2D resonant molecular system, a MoS2 bilayer crystal and a 2D non-resonant, lipid molecular bilayer is compared. Data with multiple excitation wavelengths and surfaces for the resonant system in the near- (TERS) and far-field regimes are reported. An interpretation based on weak coupling interactions within the framework of conventional resonance Raman scattering can explain the observed TERS enhancements. The non-resonant molecular lipid system, on the other hand, requires strong coupling for a full understanding of the reported observations.

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Zachary D. Schultz, John Parthenios, Rimma Dekhter, Dimitris Anestopoulos, Spyridon Grammatikopoulos, Kostantinos Papagelis, James M. Marr, David Lewis, Costas Galiotis, Dimtry Lev, Aaron Lewis. 2016-08-14. Quantum State Absorptions Coupled To Resonance Raman Spectroscopy Could Result In A General Explanation of TERS. https://arxiv.org/abs/1608.04134

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