NDLI: Echo-Less Photoconductive Antenna Sources for High-Resolution Terahertz Time-Domain Spectroscopy

Content Provider	IEEE Xplore Digital Library
Author	Maussang, K. Brewer, A. Palomo, J. Manceau, J.-M. Colombelli, R. Sagnes, I. Mangeney, J. Tignon, J. Dhillon, S.S.
Copyright Year	2011
Abstract	Interdigitated photoconductive antennas are powerful and easy-to-use sources of terahertz radiation for time-resolved spectroscopy. However, the emission of unwanted echoes, resulting from reflections of the emitted pulse in the antenna substrate, inherently limits the spectroscopic frequency resolution. A novel interdigitated photoconductive antenna that suppresses unwanted echoes from the substrate, without power losses, is proposed and demonstrated. This is realized through a buried metal geometry where a metal plane is placed at a sub-wavelength thickness below the surface antenna structure and GaAs active layer. In a reflection geometry this effectively eliminates echoes, permitting high resolution spectroscopy to be performed. As a proof-of-principle, the 1 01 -2 12 and the 2 12 -3 03 rotational lines of water vapor have been spectrally resolved with the new buried metal antenna, which are unresolvable with a standard antenna. In addition, as no THz field is lost to the substrate and reflections, the THz peak electric field amplitude is enhanced by a factor of three compared to a standard design in the equivalent reflection geometry.
Starting Page	20
Ending Page	25
Page Count	6
File Size	939892
File Format	PDF
ISSN	2156342X
Volume Number	6
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antennas Metals Substrates Gallium arsenide Standards Spectroscopy Geometry ultrafast photoconductors Sub-millimeter wave devices terahertz (THz) antenna THz photoconductive sources THz radiation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Radiation

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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