Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 9, Pages 1526-1531Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz400453r
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Funding
- ERC [258461]
- Department of Industry of the Basque Government
- European Research Council (ERC) [258461] Funding Source: European Research Council (ERC)
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Scattering-type scanning near-field optical microscopy (s-SNOM) and Fourier transform infrared nanospectroscopy (nano-FTIR) are emerging tools for nanoscale chemical material identification. Here, we push s-SNOM and nano-FTIR one important step further by enabling them to quantitatively measure local dielectric constants and infrared absorption. Our technique is based on an analytical model, which allows for a simple inversion of the near field scattering problem. It yields the dielectric permittivity and absorption of samples with 2 orders of magnitude improved spatial resolution compared to far field measurements and is applicable to a large class of samples including polymers and biological matter. We verify the capabilities by determining the local dielectric permittivity of a PMMA film from nano-FTIR measurements, which is in excellent agreement with far field ellipsometric data We further obtain local infrared absorption spectra with unprecedented accuracy in peak position and shape, which is the key to quantitative chemometrics on the nanometer scale.
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