Non-contact imaging of terahertz surface currents with aperture-type near-field microscopy

Norman, Sarah; Seddon, James; Lu, Yuezhen; Hale, Lucy; Zaman, Abdullah; Addamane, Sadhvikas Jayachandra; Brener, Igal; Degl’Innocenti, Riccardo; Mitrofanov, Oleg

doi:10.1364/oe.531690

Non-contact imaging of terahertz surface currents with aperture-type near-field microscopy

Journal Article · Mon Jun 17 00:00:00 EDT 2024 · Optics Express

DOI:https://doi.org/10.1364/oe.531690· OSTI ID:2498474

Norman, Sarah ^[1]; ^[1]; Lu, Yuezhen ^[1]; ^[2]; Zaman, Abdullah ^[3]; Addamane, Sadhvikas Jayachandra ^[4]; Brener, Igal ^[4]; ^[5]; Mitrofanov, Oleg ^[6]

Univ. College London (United Kingdom)
Eidgenoessische Technische Hochschule (ETH), Zurich (Switzerland)
Lancaster Univ., Bailrigg (United Kingdom)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Queen Mary Univ. of London (United Kingdom)
Univ. College London (United Kingdom); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)

Terahertz (THz) near-field imaging and spectroscopy provide valuable insights into the fundamental physical processes occurring in THz resonators and metasurfaces on the subwavelength scale. However, so far, the mapping of THz surface currents has remained outside the scope of THz near-field techniques. In this study, we demonstrate that aperture-type scanning near-field microscopy enables non-contact imaging of THz surface currents in subwavelength resonators. Through extensive near-field mapping of an asymmetric D-split-ring THz resonator and full electromagnetic simulations of the resonator and the probe, we demonstrate the correlation between the measured near-field images and the THz surface currents. The observed current dynamics in the interval of several picoseconds reveal the interplay between several excited modes, including dark modes, whereas broadband THz near-field spectroscopy analysis enables the characterization of electromagnetic resonances defined by the resonator geometry.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: NA0003525

OSTI ID:: 2498474

Report Number(s):: SAND--2025-00070J

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 14 Vol. 32; ISSN 1094-4087

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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