Substrate Matters: Surface-Polariton Enhanced Infrared Nanospectroscopy of Molecular Vibrations
Autor: | Lars Mester, Marta Autore, Monika Goikoetxea, Rainer Hillenbrand |
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Rok vydání: | 2019 |
Předmět: |
Surface (mathematics)
Materials science Infrared FOS: Physical sciences Bioengineering Astrophysics::Cosmology and Extragalactic Astrophysics 02 engineering and technology Applied Physics (physics.app-ph) symbols.namesake Polariton General Materials Science Spectroscopy Astrophysics::Galaxy Astrophysics business.industry Mechanical Engineering Substrate (chemistry) General Chemistry Physics - Applied Physics 021001 nanoscience & nanotechnology Condensed Matter Physics Fourier transform Molecular vibration infrared nanospectroscopy nano-FTIR field-enhanced spectroscopy SEIRA surface polaritons symbols Optoelectronics 0210 nano-technology business Physics - Optics Optics (physics.optics) |
Zdroj: | Nano Letters |
Popis: | 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. |
Databáze: | OpenAIRE |
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