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Near-Field Spectroscopy and Imaging of Subwavelength Plasmonic Terahertz Resonators

Journal Article · · IEEE Transactions on Terahertz Science and Technology
 [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
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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.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1249072
Report Number(s):
SAND--2016-1934J; 619788
Journal Information:
IEEE Transactions on Terahertz Science and Technology, Journal Name: IEEE Transactions on Terahertz Science and Technology Journal Issue: 99 Vol. PP; ISSN 2156-342X
Publisher:
IEEECopyright Statement
Country of Publication:
United States
Language:
English

Cited By (7)

Generation of two-color terahertz radiation using Smith–Purcell emitter and periodic dielectric layers journal February 2019
Enhanced Ultra-Sensitive Metamaterial Resonance Sensor based on Double Corrugated Metal stripe for Terahertz Sensing journal May 2019
Detection of internal fields in double-metal terahertz resonators journal February 2017
Perspective: Terahertz science and technology journal December 2017
Confinement of picosecond timescale current pulses by tapered coplanar waveguides journal April 2018
Near-field spectroscopy and tuning of sub-surface modes in plasmonic terahertz resonators journal January 2018
Phase-sensitive terahertz imaging using room-temperature near-field nanodetectors journal January 2018

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Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Antennas
aperture
carbon fibers
graphite
near-field microscopy
plasmons
resonators
terahertz (THz)