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. 2017 Sep 1;3(9):e1603317. doi: 10.1126/sciadv.1603317

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Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 1 — (A and B) FTIR emission spectra of the two mid-IR pumps and the resulting THz DFG, collected at heat-sink temperatures (T_H) of 65 K (A) and 85 K (B) in rapid-scan mode with a 0.125 cm⁻¹ (3.75 GHz) spectral resolution, plotted as a function of the driving current. Identical colors in the mid-IR and THz spectra correspond to identical driving current conditions. (C) Current-voltage and light-current characteristics of the mid-IR pumps and THz DFG for the device operated in CW mode at 85 K.