Abstract
We investigate the role of tip-sample interaction in nonlinear optical scanning near-field microscopy. The experiment was performed by tightly focusing femtosecond laser pulses onto a sharp gold tip that was positioned in close proximity to the surface of a sample with gold nanostructures on a Si-substrate by shear force feedback. The nonlinear optical signal consists of two-photon photoluminescence and second harmonic signal from the gold tip and the gold nanostructures. These signals can be used to characterize different coupling parameters such as geometry, material and width of the tip-sample gap and enable to reveal the mechanism responsible for the image contrast. Under the excitation with 776-nm and 110-fs laser pulses nonlinear imaging is almost background free and yields super resolution showing features with dimensions significantly below the diffraction limit with a signal intensity following quadratic excitation power law.
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Acknowledgements
We acknowledge for financing of the Deutsche Forschungsgemeinschaft priority program (SPP 1391) and the Institutional Strategy of the University of Tübingen (Deutsche Forschungsgemeinschaft, ZUK 63). We thank Prof. P. Leiderer, Konstanz for supplying the sample.
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This article is part of the topical collection “Ultrafast Nanooptics” guest edited by Martin Aeschlimann and Walter Pfeiffer.
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Horneber, A., Wackenhut, F., Braun, K. et al. Two-photon luminescence contrast by tip-sample coupling in femtosecond near-field optical microscopy. Appl. Phys. B 123, 49 (2017). https://doi.org/10.1007/s00340-016-6610-x
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DOI: https://doi.org/10.1007/s00340-016-6610-x