Fabian Mooshammer, Markus Plankl, Thomas Siday, Martin Zizlsperger, Fabian Sandner, Rocco Vitalone, Ran Jing, Markus A. Huber, D. N. Basov, and Rupert Huber
https://www.osapublishing.org/viewmedia.cfm?r=1&rwjcode=ol&uri=ol-46-15-3572&seq=0
By sampling terahertz waveforms emitted from InAs surfaces, we reveal how the entire, realistic geometry of typical near-field probes drastically impacts the broadband electromagnetic fields. In the time domain, these modifications manifest as a shift in the carrier-envelope phase and emergence of a replica pulse with a time delay dictated by the length of the cantilever. This interpretation is fully corroborated by quantitative simulations of terahertz emission nanoscopy based on the finite element method. Our approach provides a solid theoretical framework for quantitative nanospectroscopy and sets the stage for a reliable description of subcycle, near-field microscopy at terahertz frequencies.
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