Terahertz polarization spectroscopy in the near-field zone of a sub-wavelength-scale metal slit

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Time-domain spectroscopy is used to probe the polarization dependence of the terahertz-frequency absorption of alpha-lactose molecules in the near-field vicinity of a sub-wavelength-scale metal slit. The experimental result finds that the 0.53-THz absorption of this material has an unexpected polarization dependence, strongly coupled to the slit orientation; in particular, the electric wave in parallel polarization exhibits even complete vanishing of the otherwise resonant strong absorption. The physics behind this phenomena may be explained based on the Bethe's sub-wavelength diffraction: the electric field that is measured in the far field, but diffracted from a sub-wavelength-scale metal aperture, originates from solely magnetic dipole radiation and not from the electric dipole radiation, thus showing no electrically-coupled material response. (C) 2016 Optical Society of America
Publisher
OPTICAL SOC AMER
Issue Date
2016-09
Language
English
Article Type
Article
Keywords

DIFFRACTION; ABSORPTION; APERTURES; HOLES

Citation

OPTICS EXPRESS, v.24, no.19, pp.21276 - 21285

ISSN
1094-4087
DOI
10.1364/OE.24.021276
URI
http://hdl.handle.net/10203/214849
Appears in Collection
PH-Journal Papers(저널논문)
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