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Terahertz (THz) wideband sources are required nowdays in many field, such as spectroscopy, astronomy and radio physics. We present a new implementation for a flux-flow oscillator (FFO) based on a long Josephson junction providing the THz emission in the open space. The FFO was used earlier in our team merely as an on-chip heterodyne for the SIS receiver [1-2], it has a really wide operating range up to 100% of central frequency and a power of about 1 μW. Based on the Nb/AlN/NbN trilayer the FFO with dimensions 400x16 μm provides the output radiation from 200 GHz up to 750 GHz with the spectral linewidth of about 1 MHz. The upper operating frequency can reach 1 THz. The phase-lock loop (PLL) is used for the phase locking of the emission collecting up to 97% of the output THz power in the peak with a width of about 40 kHz. Such oscillator implemented as an external source could be useful for many tasks – gas spectroscopy, heterodyne receivers, etc.

Wideband Josephson THz flux-flow oscillator integrated with the slot lens antenna and the harmonic mixer