Highly Efficient Resonant Tunneling Diode Terahertz Oscillator With a Split Ring Resonator
Xiongbin Yu, Yusei Suzuki, Mai Van Ta, Safumi Suzuki, Masahiro Asada
Abstract
Compact resonant tunneling diode (RTD) oscillators have attracted considerable attention for terahertz generation at room temperature. Here, we propose and fabricate a novel and highly efficient RTD with a square split ring resonator (SRR). An AlAs/InGaAs double-barrier RTD is integrated into the center split gap of the SRR with a perimeter of 52 μm. Coplanar stripline antennas are integrated with the SRR to increase the radiation efficiency. The highest measured oscillation frequency is 1.22 THz with an output power of ~ 7 μW. The measured highest output power is ~ 30 μW at 0.9 THz. The experimental results are in good agreement with the simulations. This work will promote the further studies of THz metamaterials.