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Title: Near-Field Spectroscopy and Imaging of Subwavelength Plasmonic Terahertz Resonators

We describe the temporal evolution of the terahertz (THz) field leading to the excitation of plasmonic resonances in carbon microfibers. The field evolution is mapped in space and time for the 3/2 wavelength resonance using a subwavelength aperture THz near-field probe with an embedded THz photoconductive detector. The excitation of surface waves at the fiber tips leads to the formation of a standing wave along the fiber. Local THz time-domain spectroscopy at one of the standing wave crests shows a clear third-order resonance peak at 1.65 THz, well described by the Lorentz model. Lastly, this application of the subwavelength aperture THz near-field microscopy for mode mapping and local spectroscopy demonstrates the potential of near-field methods for studies of subwavelength plasmonic THz resonators.
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [4]
  1. Univ. College London (UCL), London (United Kingdom). Electronic and Electrical Engineering Department
  2. Univ. College London (UCL), London (United Kingdom). Electronic and Electrical Engineering Department; King's College London (United Kingdom); ITMO Univ., St. Peterburg (Russia)
  3. St. Petersburg Polytechnic Univ., St. Petersburg (Russia)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Publication Date:
Report Number(s):
Journal ID: ISSN 2156-342X; 619788
Grant/Contract Number:
AC04-94AL85000; U130493; 074- U01; 14-07-31272; EP/L015277/1
Accepted Manuscript
Journal Name:
IEEE Transactions on Terahertz Science and Technology
Additional Journal Information:
Journal Volume: PP; Journal Issue: 99; Journal ID: ISSN 2156-342X
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Antennas; aperture; carbon fibers; graphite; near-field microscopy; plasmons; resonators; terahertz (THz)
OSTI Identifier: