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. 2016 Mar 24;6:23595. doi: 10.1038/srep23595

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(a,b) Characterizations of THz spectral tuning for the two SGDFB-DBR devices designed with different frequency spacings. The black arrows indicate the tuning by changing currents on SG2, and the red arrows indicate the frequency tuning by changing currents on SG1. (c) The corresponding CW THz power and conversion efficiency in the tunable THz frequency range for the two monolithic devices.