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Browse Journals & Magazines > Applied Physics Letters ...> Volume:97 Issue:7 Help

Highly sensitive terahertz measurement of layer thickness using a two-cylinder waveguide sensor

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3 Author(s)
Theuer, M. ; School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA ; Beigang, R. ; Grischkowsky, D.

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We report on the layer thickness determination on dielectrically coated metal cylinders using terahertz (THz) time-domain spectroscopy. A considerable sensitivity increase of up to a factor of 150 is obtained for layers down to 2.5 μm thickness by introducing an experimental geometry based on a two-cylinder waveguide sensor. The layer attached on one metal cylinder is guided in contact with the second metal cylinder in the THz beam waist. This approach uses concepts of adiabatic THz wave compression and the advantages of THz waveguides. The results are compared to measurements on free-standing layers.

Published in:
Applied Physics Letters  (Volume:97 ,  Issue: 7 )

Date of Publication: Aug 2010

Page(s):
071106 - 071106-3
ISSN :
0003-6951
Digital Object Identifier :
10.1063/1.3481080
Product Type:
Journals & Magazines
Date of Current Version :
16 September 2010
Issue Date :
Aug 2010

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