Abstract
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.
© 2021 Optical Society of America
Full Article | PDF ArticleMore Like This
Sergey Bodrov, Aleksey Murzanev, Aleksey Korytin, and Andrey Stepanov
Opt. Lett. 46(23) 5946-5949 (2021)
Thomas Siday, Michele Natrella, Jiang Wu, Huiyun Liu, and Oleg Mitrofanov
Opt. Express 25(22) 27874-27885 (2017)
Alexandre Stathopulos, Stefan Skupin, and Luc Bergé
Opt. Lett. 46(23) 5906-5909 (2021)