Surface plasmon waves for broadband THz spectroscopy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F14%3A00486616" target="_blank" >RIV/68378271:_____/14:00486616 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1117/12.2029352" target="_blank" >http://dx.doi.org/10.1117/12.2029352</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1117/12.2029352" target="_blank" >10.1117/12.2029352</a>

Result language
angličtina
Original language name
Surface plasmon waves for broadband THz spectroscopy
Original language description
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.
Czech name
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Czech description
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Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proceedings of SPIE - Quantum Sensing and Nanophotonic Devices XI
ISBN
978-081949906-6
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
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Publisher name
SPIE
Place of publication
Bellingham
Event location
San Francisco
Event date
Feb 2, 2014
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000334025500029

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