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Near-field optical microscopy progressed quite a bit since the first "Gedankenexperiment" by Synge1 to the first experimental realization by Pohl2 and Lewis3. Although it took almost a decade for the first near-field Raman experiments4,5 and even longer for the first near-field SERS experiments6, since then the pace increased considerably mainly due to the independent simultaneous development of tip-enhanced Raman scattering by several groups7,8,9. The technique was picked up quickly as an unique technique to investigate the structural composition of surfaces with nanometer precision. Beyond the surface analytical aspects also fundamental aspects regarding resolution became the focus since several experiments demonstrated unprecedented and also unexpected resolution capabilities of TERS10,11. Consequently also theoretical investigations on a quantum physics, but also on a classical, level pointed towards extreme spatial resolutions.12-14 The high resolution aspects of near-field Raman spectroscopy will be the topic of this presentation and recent theoretical and experimental results, of our research will be presented. The broad range of applications on applied surface science has been nicely covered major reviews covering TERS just last year15-19, hence, only selected examples that highlight the high resolution aspects under ambient conditions will be presented here.
References
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- Zhang, R. et al., Nature 2013; 498, 82.
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- Barbry, M. et al. , Nano Lett 2015; 15, 3410.
- Latorre, F. et al., Nanoscale 2016; 8, 10229.
- Trautmann, S. et al., Nanoscale 2017; 9, 391.
- Deckert-Gaudig, T. et al., Chem. Soc. Rev. 2017; 46: 4077.
- Richard-Lacroix, M. et al., Chem. Soc. Rev. 2017; 46: 3922.
- Wang, X. et al., Chem. Soc. Rev. 2017; 47: 9212
- Zrimsek, A. B. et al., Chem Rev 2017; 117: 7583
- Verma, P. T Chem Rev 2017; 117: 6447.
