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An all-cryogenic THz transmission spectrometer

Burke, P. J. and Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (2002) An all-cryogenic THz transmission spectrometer. Review of Scientific Instruments, 73 (1). pp. 130-135. ISSN 0034-6748. doi:10.1063/1.1426231.

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This article describes a THz transmission spectrometer for the spectral range of 2–65 cm–1 (100 GHz to 2 THz) with a spectral resolution of at least 1.8 cm–1 (50 GHz) where the source, sample, and detector are all fully contained in a cryogenic environment. Cyclotron emission from a two-dimensional electron gas (2DEG) heated with an electrical current serves as a magnetic-field tunable source. The spectrometer is demonstrated at 4.2 K by measuring the resonant cyclotron absorption of a second 2DEG. Unique aspects of the spectrometer are that (1) an ultrabroadband detector is used, and (2) the emitter is run quasicontinuously with a chopping frequency of only 1 Hz. Since optical coupling to room temperature components is not necessary, this technique is compatible with ultralow temperature (sub-100 mK) operation.

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Additional Information:©2002 American Institute of Physics. (Received 26 July 2001; accepted 8 October 2001) This work was supported by Sandia National Labs Grant No. DE-AC04-AL85000 and DOE Grant No. DE-FG03-99ER45766. One of the authors (P.J.B.) was supported in part by the Sherman Fairchild Foundation.
Subject Keywords:infrared spectrometers; two-dimensional electron gas; cyclotron resonance; spectral line breadth
Issue or Number:1
Record Number:CaltechAUTHORS:BURrsi02
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2075
Deposited By: Archive Administrator
Deposited On:06 Mar 2006
Last Modified:08 Nov 2021 19:44

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