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- W1911407951 abstract "Field-enhanced scanning optical microscopy relies on the design and fabrication of plasmonic probes which had to provide optical and chemical contrast at the nanoscale. In order to do so, the scattering containing the near-field information recorded in a field-enhanced scanning optical microscopy experiment, has to surpass the background light, always present due to multiple interferences between the macroscopic probe and sample. In this work, we show that when the probe–sample distance is modulated with very low amplitude, the higher the harmonic demodulation is, the better the ratio between the near-field signal and the interferometric background results. The choice of working at a given n harmonic is dictated by the experiment when the signal at the n + 1 harmonic goes below the experimental noise. We demonstrate that the optical contrast comes from the nth derivative of the near-field scattering, amplified by the interferometric background. By modelling the far and near field we calculate the probe–sample approach curves, which fit very well the experimental ones. After taking a great amount of experimental data for different probes and samples, we conclude with a table of the minimum enhancement factors needed to have optical contrast with field-enhanced scanning optical microscopy." @default.
- W1911407951 created "2016-06-24" @default.
- W1911407951 creator A5004258808 @default.
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- W1911407951 date "2014-09-17" @default.
- W1911407951 modified "2023-09-26" @default.
- W1911407951 title "Harmonic demodulation and minimum enhancement factors in field-enhanced near-field optical microscopy" @default.
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- W1911407951 doi "https://doi.org/10.1111/jmi.12185" @default.
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