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Proceedings Paper

Surface plasmon waves for broadband THz spectroscopy
Author(s): O. Mitrofanov; M. Navarro-Cia; R. Mueckstein; M. Natrella; C. Graham; C. C. Renaud; A. J. Seeds; F. Dominec; P. Kužel; J. C. Delagnes; P. Mounaix
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Paper Abstract

In this presentation we discuss application of broadband terahertz (THz) time-domain spectroscopy for probing subwavelength (micrometer) size objects. The problem of weak coupling between THz waves and sub-wavelength objects, which limits the use of THz spectroscopy to large samples, is mitigated by employing surface plasmon waves. In one implementation, THz surface waves, excited on a broad-band planar THz bow-tie antenna, are used to enhance the interaction with a small particle placed on the antenna surface. The surface field distribution near the particle is mapped with an integrated sub-wavelength aperture THz near-field probe. We demonstrate that imaging and probing of the subwavelength size dielectric particles (TiO2 and SrTiO3) can be realized using the enhanced THz field between the antenna and the probe. We also discuss THz wave confinement using two sharp metallic needles. We demonstrate that in the near-field region of the needle tips, the electric field of THz pulses is concentrated to a volume smaller than (10 μm)3 without limiting the THz pulse bandwidth. Application of both methods for high spatial resolution imaging and spectroscopy will be discussed.

Paper Details

Date Published: 31 January 2014
PDF: 6 pages
Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 89931B (31 January 2014); doi: 10.1117/12.2029352
Show Author Affiliations
O. Mitrofanov, Univ. College London (United Kingdom)
M. Navarro-Cia, Univ. College London (United Kingdom)
Imperial College London (United Kingdom)
R. Mueckstein, Univ. College London (United Kingdom)
M. Natrella, Univ. College London (United Kingdom)
C. Graham, Univ. College London (United Kingdom)
C. C. Renaud, Univ. College London (United Kingdom)
A. J. Seeds, Univ. College London (United Kingdom)
F. Dominec, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
P. Kužel, Institute of Physics of the ASCR, v.v.i. (Czech Republic)
J. C. Delagnes, LOMA, Bordeaux 1 Univ., CNRS (France)
P. Mounaix, LOMA, Bordeaux 1 Univ., CNRS (France)

Published in SPIE Proceedings Vol. 8993:
Quantum Sensing and Nanophotonic Devices XI
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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