Journal
NANO LETTERS
Volume 19, Issue 11, Pages 8066-8073Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b03257
Keywords
infrared nanospectroscopy; nano-FTIR; field-enhanced spectroscopy; SEIRA; surface polaritons
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Funding
- Spanish Ministry of Science, Innovation and Universities [MAT2015-65525-R, RTI2018-094830-B-100]
- Spanish Ministry of Science, Innovation and Universities (Marie de Maeztu Units of Excellence Program) [MDM-2016-0618]
- European Union's Horizon2020 research and innovation programme under the Marie Sklodowska-Curie grant [721874]
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Infrared nanospectroscopy based on Fourier transform infrared near-field spectroscopy (nano-FTIR) is an emerging nanoanalytical tool with large application potential for label-free mapping and identification of organic and inorganic materials with nanoscale spatial resolution. However, the detection of thin molecular layers and nanostructures on standard substrates is still challenged by weak signals. Here, we demonstrate a significant enhancement of nano-FTIR signals of a thin organic layer by exploiting polariton-resonant tip-substrate coupling and surface polariton illumination of the probing tip. When the molecular vibration matches the tip-substrate resonance, we achieve up to nearly one order of magnitude signal enhancement on a phonon-polaritonic quartz (c-SiO2) substrate, as compared to nano-FTIR spectra obtained on metal (Au) substrates, and up to two orders of magnitude when compared to the standard infrared spectroscopy substrate CaF2. Our results will be of critical importance for boosting nano-FTIR spectroscopy toward the routine detection of monolayers and single molecules.
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