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Open AccessArticle

Subwavelength Nanostructuring of Gold Films by Apertureless Scanning Probe Lithography Assisted by a Femtosecond Fiber Laser Oscillator

Department of Physical Chemistry, University of Vienna, Währinger Strasse 42, Vienna A-1090, Austria
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Nanomaterials 2018, 8(7), 536; https://doi.org/10.3390/nano8070536
Received: 5 June 2018 / Revised: 10 July 2018 / Accepted: 11 July 2018 / Published: 16 July 2018
(This article belongs to the Special Issue Laser-Based Nano Fabrication and Nano Lithography)
Optical methods in nanolithography have been traditionally limited by Abbe’s diffraction limit. One method able to overcome this barrier is apertureless scanning probe lithography assisted by laser. This technique has demonstrated surface nanostructuring below the diffraction limit. In this study, we demonstrate how a femtosecond Yb-doped fiber laser oscillator running at high repetition rate of 46 MHz and a pulse duration of 150 fs can serve as the laser source for near-field nanolithography. Subwavelength features were generated on the surface of gold films down to a linewidth of 10 nm. The near-field enhancement in this apertureless scanning probe lithography setup could be determined experimentally for the first time. Simulations were in good agreement with the experiments. This result supports near-field tip-enhancement as the major physical mechanisms responsible for the nanostructuring. View Full-Text
Keywords: near-field; femtosecond laser; nanolithography; subwavelength; tip-enhancement; AFM near-field; femtosecond laser; nanolithography; subwavelength; tip-enhancement; AFM
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Falcón Casas, I.; Kautek, W. Subwavelength Nanostructuring of Gold Films by Apertureless Scanning Probe Lithography Assisted by a Femtosecond Fiber Laser Oscillator. Nanomaterials 2018, 8, 536.

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