THz Clinotron Operating in New Regime of Hybrid Surface-Volume Mode with Wide Frequency Tuning Range

We present new design of a wideband THz clinotron with a non-uniform grating operating in a new regime of surface-volume fields excitation, the hybrid cavity mode. Simulations have shown that varying the grooves depth of a periodically modified grating enables to get the frequency tuning band up to 20 GHz for the 0.5 THz clinotron oscillator.