Journal
APPLIED PHYSICS LETTERS
Volume 97, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3467192
Keywords
circular waveguides; dielectric materials; dielectric waveguides; near-field scanning optical microscopy
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- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)
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Using near-field, terahertz time-domain spectroscopy (THz-TDS), we investigate how the addition of a dielectric material into a subwavelength-diameter, cylindrical waveguide affects its transmission properties. The THz electric near-field is imaged with deep subwavelength resolution as it emerges from filled and unfilled waveguides. Spectroscopic data measured for waveguides filled with polycrystalline D-tartaric acid, and with polyethylene and silicon powders, illustrate the feasibility of this approach for obtaining spectroscopic information from a tiny sample volume. (C) 2010 American Institute of Physics. [doi:10.1063/1.3467192]
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