Operation of resonant-tunnelling-diode oscillators beyond tunnel-lifetime limit at 564 GHz
Technische Universität Darmstadt - Merckstr. 25, 64283 Darmstadt, Germany, EU
2 ACST GmbH - Merckstr. 25, 64283 Darmstadt, Germany, EU
Accepted: 1 February 2012
We present resonant-tunnelling-diode (RTD) oscillators, which are operating at frequencies up to 564 GHz. Due to heavy doping of the collector side of our diodes, the oscillators are operating beyond the tunnel-lifetime (τ) and relaxation-time (τrel) limits of RTDs. At 564 GHz we achieve ωτ≈1.2 and ωτrel≈2.6, the highest previously reported value of ωτ at frequencies >150 GHz was ≈0.6. Our study indicates that operating frequencies of RTD oscillators could be significantly increased and RTDs should be capable of operating at frequencies of several THz.
PACS: 85.30.Mn – Junction breakdown and tunneling devices (including resonance tunneling devices) / 73.40.Gk – Tunneling / 85.35.Be – Quantum well devices (quantum dots, quantum wires, etc.)
© EPLA, 2012