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We have measured coherent terahertz emission spectra fromBi2Sr2CaCu2O8+\delta\ mesa devices, as a function of temperature and mesa biasvoltage. The emission frequency is found to be tunable by up to 12% by varyingthe temperature and bias voltage. We attribute the appearance of tunability toasymmetric boundaries at the top and bottom, and the non-rectangularcross-section of the mesas. This interpretation is consistent with numericalsimulations of the dynamics of intrinsic Josephson junctions in the mesa.Easily tunable emission frequency may have important implications for thedesign of terahertz devices based on stacked intrinsic Josephson junctions.

Tunable terahertz emission from Bi2Sr2CaCu2O8+\delta\ mesa devices