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. 2016 Mar 15;6:23053. doi: 10.1038/srep23053

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(a–c) Microwave (solid line) and THz (dashed line) components of the light-current characteristics of sample B, measured at heat sink temperatures of (a) 10 K, (b) 50 K, and (c) 80 K. Being the responsivity of the pyroelectric detector unknown in the microwave regime, the vertical axis shows the raw voltage signal read by the pyroelectric sensor, which is proportional to the emitted radiation intensity. (d) Microwave emission spectrum of a sample B collected at heat sink temperatures in the range 250–285 K. The sample was biased in pulsed mode (200 ns pulse width and 10 kHz repetition rate), and the displayed microwave power is normalized to the noise floor of the spectrum analyzer.