Abstract
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 timedomain
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-fieldmethods for studies
of subwavelength plasmonic THz resonators.
(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 timedomain
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-fieldmethods for studies
of subwavelength plasmonic THz resonators.
| Original language | English |
|---|---|
| Pages (from-to) | 382-388 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Terahertz Science and Technology |
| Volume | 6 |
| Issue number | 3 |
| Publication status | Published - 3 May 2016 |