Open AccessQuantitative terahertz emission nanoscopy with multiresonant near-field probes
Author(s) -
Fabian Mooshammer,
Markus Plankl,
Thomas Siday,
Martin Zizlsperger,
Fabian Sandner,
Rocco Vitalone,
Ran Jing,
Markus A. Huber,
D. N. Basov,
Rupert Huber
Publication year - 2021
Publication title -
optics letters/optics index
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.430400
Subject(s) - terahertz radiation , optics , terahertz spectroscopy and technology , near field scanning optical microscope , physics , electromagnetic pulse , electromagnetic field , envelope (radar) , broadband , ultrashort pulse , near and far field , microscopy , photomixing , materials science , optical microscope , terahertz metamaterials , far infrared laser , laser , telecommunications , scanning electron microscope , radar , quantum mechanics , computer science
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.