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Measurement setup for sub-THz radiation. The left inset shows the sample photo compared to an eurocent coin.
Typical curves of the junction array and sub-THz radiation peaks. (a) The detected power [curve (a)] measured with the bias current sweeping up [curve (b)]; the detected power [curve (c)] measured with the bias current sweeping down [curve (d)]. (b) By changing the parameters of the external quasioptical resonator, the amplitude of the radiation peaks at frequencies higher than 0.15 THz increases.
Tunable and coherent non-Josephson radiation around 0.143 THz. (a) Three bias points marked by arrows were chosen to observe the radiation peaks on the spectrum analyzer after a heterodyne receiver, which shows that the radiation on the self-induced step is tunable. (b) Radiation power as the function of the square of the number of biased junctions.
Electric field distributions of resonant modes on the surface of silicon substrate cavity excited by the large array of Josephson junctions. The resonant modes at frequencies 0.088, 0.131, 0.143, 0.155, 0.166, 0.176, 0.190, 0.230, 0.241, and 0.252 THz are labeled from (a)–(j).
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