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      Tip-enhanced infrared nanospectroscopy via molecular expansion force detection

      Author(s): , ,
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      Journal: Nature Photonics
      Publisher: Springer Nature

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          Effect of contact deformations on the adhesion of particles

          B.V Derjaguin, V.M Muller, Yu.P Toporov (1975)
          Article 0 comments Cited 617 times – based on 0 reviews     Review now
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            Phonon-enhanced light matter interaction at the nanometre scale.

            R. Hillenbrand, T Taubner, F Keilmann (2002)
            Optical near fields exist close to any illuminated object. They account for interesting effects such as enhanced pinhole transmission or enhanced Raman scattering enabling single-molecule spectroscopy. Also, they enable high-resolution (below 10 nm) optical microscopy. The plasmon-enhanced near-field coupling between metallic nanostructures opens new ways of designing optical properties and of controlling light on the nanometre scale. Here we study the strong enhancement of optical near-field coupling in the infrared by lattice vibrations (phonons) of polar dielectrics. We combine infrared spectroscopy with a near-field microscope that provides a confined field to probe the local interaction with a SiC sample. The phonon resonance occurs at 920 cm(-1). Within 20 cm(-1) of the resonance, the near-field signal increases 200-fold; on resonance, the signal exceeds by 20 times the value obtained with a gold sample. We find that phonon-enhanced near-field coupling is extremely sensitive to chemical and structural composition of polar samples, permitting nanometre-scale analysis of semiconductors and minerals. The excellent physical and chemical stability of SiC in particular may allow the design of nanometre-scale optical circuits for high-temperature and high-power operation.
            Article 0 comments Cited 203 times – based on 0 reviews     Review now
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              Nano-FTIR absorption spectroscopy of molecular fingerprints at 20 nm spatial resolution.

              Florian Huth, Wiwat Nuansing, Alexander A. Govyadinov … (2012)
              We demonstrate Fourier transform infrared nanospectroscopy (nano-FTIR) based on a scattering-type scanning near-field optical microscope (s-SNOM) equipped with a coherent-continuum infrared light source. We show that the method can straightforwardly determine the infrared absorption spectrum of organic samples with a spatial resolution of 20 nm, corresponding to a probed volume as small as 10 zeptoliter (10(-20) L). Corroborated by theory, the nano-FTIR absorption spectra correlate well with conventional FTIR absorption spectra, as experimentally demonstrated with poly(methyl methacrylate) (PMMA) samples. Nano-FTIR can thus make use of standard infrared databases of molecular vibrations to identify organic materials in ultrasmall quantities and at ultrahigh spatial resolution. As an application example we demonstrate the identification of a nanoscale PDMS contamination on a PMMA sample.
              Article 0 comments Cited 132 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Title: Nature Photonics
                Abbreviated Title: Nature Photon
                Publisher: Springer Nature
                ISSN (Print): 1749-4885
                ISSN (Electronic): 1749-4893
                Publication date Created: January 19 2014
                Publication date (Print): January 19 2014
                Volume: 8
                Issue: 4
                Pages: 307-312
                Article
                DOI: 10.1038/nphoton.2013.373
                SO-VID: b01c8b1a-cde0-48a8-9a8b-ac066c24bad1
                Copyright © © 2014
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