Nanoscale polymer recognition by spectral signature in scattering infrared near-field microscopy
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- T. Taubner
- Abt. Molekulare Strukturbiologie, Max-Planck-Institut für Biochemie & Center for NanoScience , 82152 Martinsried, München, Germany
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- R. Hillenbrand
- Nano-Photonics Group, Max-Planck-Institut für Biochemie & Center for NanoScience , 82152 Martinsried, München, Germany
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- F. Keilmann
- Abt. Molekulare Strukturbiologie, Max-Planck-Institut für Biochemie & Center for NanoScience , 82152 Martinsried, München, Germany
Abstract
<jats:p>We demonstrate—for a typical polymer vibrational infrared line—that scattering-type “apertureless” optical near-field microscopy features a spectral signature that differs characteristically from far-field absorption. Theory predicts a dispersion-like amplitude spectrum (besides an absorption-like, bell-shaped phase spectrum). This signature is experimentally verified for a vibrational resonance of PMMA, by probing with a CO laser tuned from 5.5 to 6 μm. We apply this signature to identify PMMA in the near-field imaging of a nanostructured PMMA/PS polymer blend, at <70nm resolution. Our results suggest a potentially quantitative chemometry based on near-field infrared vibrational fingerprints with spatial resolution that could reach 10 nm.</jats:p>
Journal
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- Applied Physics Letters
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Applied Physics Letters 85 (21), 5064-5066, 2004-11-22
AIP Publishing
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Details 詳細情報について
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- CRID
- 1362262944018682496
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- ISSN
- 10773118
- 00036951
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- Data Source
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- Crossref