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Tunable terahertz emission from Bi2Sr2CaCu2O8+\delta\ mesa devices

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arxiv 1108.0143 v1 pith:5RSBT53E submitted 2011-07-31 cond-mat.supr-con

T. M. Benseman , A. E. Koshelev , K. E. Gray , W.-K. Kwok , U. Welp , K. Kadowaki , M. Tachiki , T. Yamamoto This is my paper · ORCID
classification cond-mat.supr-con
keywords emissionmesadevicesterahertztunablebi2sr2cacu2o8biasdelta
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We have measured coherent terahertz emission spectra from Bi2Sr2CaCu2O8+\delta\ mesa devices, as a function of temperature and mesa bias voltage. The emission frequency is found to be tunable by up to 12% by varying the temperature and bias voltage. We attribute the appearance of tunability to asymmetric boundaries at the top and bottom, and the non-rectangular cross-section of the mesas. This interpretation is consistent with numerical simulations of the dynamics of intrinsic Josephson junctions in the mesa. Easily tunable emission frequency may have important implications for the design of terahertz devices based on stacked intrinsic Josephson junctions.

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