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Title: Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy

In this study, we observe dipole resonances in thin conductive carbon micro-fibers by detecting an enhanced electric field in the near-field of a single fiber at terahertz (THz) frequencies. Time-domain analysis of the electric field shows that each fiber sustains resonant current oscillations at the frequency defined by the fiber's length. Strong dependence of the observed resonance frequency and degree of field enhancement on the fibers' conductive properties enable direct non-contact probing of the THz conductivity in single carbon micro-fibers. We find the conductivity of the fibers to be within the range of 1– 5∙104 S/m. This approach is suitable for experimental characterization of individual doped semiconductor resonators for THz metamaterials and devices.
 [1] ;  [2] ;  [3] ;  [3] ;  [4] ;  [5]
  1. Univ. College London, London (United Kingdom); ITMO Univ., St. Petersburg (Russia); Public Univ. of Navarra, Navarra (Spain)
  2. Univ. College London, London (United Kingdom); Imperial College London, London (United Kingdom)
  3. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  4. St. Petersburg State Polytechnic Univ., St. Petersburg (Russia)
  5. Univ. College London, London (United Kingdom); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0003-6951; APPLAB; 608005
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 2; Journal ID: ISSN 0003-6951
American Institute of Physics (AIP)
Research Org:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY semiconductors; carbon; electric fields; plasmons; terahertz spectroscopy