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Photoresponsive polymers for topographic simulation of the optical near-field of a nanometer sized gold tip in a highly focused laser beam

Abstract : The local perturbation of a diffraction-limited spot by a nanometer sized gold tip in a popular apertureless scanning near-field optical microscopy (ASNOM) configuration is reproduced through topography changes in a photoresponsive polymer. Our method relies on the observation of the photochemical migration of azobenzene molecules grafted to a polymer placed beneath the tip. A local molecular displacement has been shown to be activated by a gold tip as a consequence of the lateral surface charge density present at the edges of the tip’s end, resulting from a strong near-field depolarization predicted by theory.
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https://hal-utt.archives-ouvertes.fr/hal-02441865
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Submitted on : Thursday, January 16, 2020 - 11:08:24 AM
Last modification on : Tuesday, October 6, 2020 - 4:30:49 PM

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Yann Gilbert, Renaud Bachelot, Alexandre Vial, Gilles Lerondel, Pascal Royer, et al.. Photoresponsive polymers for topographic simulation of the optical near-field of a nanometer sized gold tip in a highly focused laser beam. Optics Express, Optical Society of America - OSA Publishing, 2005, 13 (10), pp.3619. ⟨10.1364/OPEX.13.003619⟩. ⟨hal-02441865⟩

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