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Type: Journal article
Title: Direct probing of evanescent field for characterization of porous terahertz fibers
Author: Atakaramians, S.
Afshar Vahid, S.
Nagel, M.
Rasmussen, H.
Bang, O.
Monro, T.
Abbott, D.
Citation: Applied Physics Letters, 2011; 98(12):1-3
Publisher: Amer Inst Physics
Issue Date: 2011
ISSN: 0003-6951
Statement of
Shaghik Atakaramians, Shahraam Afshar V., Michael Nagel, Henrik K. Rasmussen, Ole Bang, Tanya M. Monro, and Derek Abbott
Abstract: We develop a technique based on a micromachined photoconductive probe-tip to characterize a terahertz (THz) porous fiber. Losses less than 0.08 cm-1 are measured in the frequency range from 0.2 to 0.35 THz, with the minimum of 0.003 cm-1 at 0.24 THz. Normalized group velocity greater than 0.8, which corresponds to dispersion values in between -1.3 and -0.5 ps/m/μm for 0.2<f<0.35 THz are obtained. Moreover, we directly measure the evanescent electric field as a function of frequency. Good agreement between the measured curves and expected theoretical values indicates the low invasiveness of the applied probe-tip. © 2011 American Institute of Physics.
Rights: © 2011 American Institute of Physics
DOI: 10.1063/1.3568892
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