Near-Field Spectroscopy and Imaging of Subwavelength Plasmonic Terahertz Resonators

We present 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 photocondu...

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Bibliographic Details
Published in:IEEE transactions on terahertz science and technology 2016-05, Vol.6 (3), p.382-388
Main Authors: Mitrofanov, Oleg, Khromova, Irina, Siday, Thomas, Thompson, Robert J., Ponomarev, Andrey N., Brener, Igal, Reno, John L.
Format: Article
Language:English
Subjects:
Antennas
aperture
Apertures
carbon fibers
Detectors
Excitation
Fibers
graphite
Mathematical models
near-field microscopy
Optical resonators
Plasmonics
Plasmons
Probes
Resonators
Sensitivity
Spatial resolution
Spectroscopy
Standing waves
terahertz (THz)
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Summary:We present 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. 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.
ISSN:2156-342X
2156-3446
DOI:10.1109/TTHZ.2016.2549367