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Nanoscale polymer recognition by spectral signature in scattering infrared near-field microscopy
Abstract
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.
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Citations
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Time-domain mid-infrared frequency-comb spectrometer
Keilmann, F., Gohle, C., & Holzwarth, R. (2004) · Optics Letters · doi:10.1364/ol.29.001542 · Cited by 734
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Cited by
Pseudoheterodyne detection for background-free near-field spectroscopy
Ocelic, N., Huber, A., & Hillenbrand, R. (2006) · Applied Physics Letters · doi:10.1063/1.2348781 · Cited by 579
Self-citationFrequency-comb infrared spectrometer for rapid, remote chemical sensing
Schliesser, A., Brehm, M., Keilmann, F., & van der Weide, D. W. (2005) · Optics Express · doi:10.1364/opex.13.009029 · Cited by 384
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Metadata
- Authors
- Taubner, T., Hillenbrand, R., & Keilmann, F.
- Venue
- Applied Physics Letters
- Publisher
- AIP Publishing
- Published
- 2004-11-22
- Volume
- 85
- Issue
- 21
- Pages
- 5064-5066
- ISSN
- 0003-6951 (ISSN-L)
- 1077-3118
- OpenAlex
- W2008843165
- Cited by
- 206
- References
- 1
- FWCI
- 8.33
- Type
- journal article
- Language
- en
- Open access
- closed
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