Self-pumping effects and radiation linewidth of Josephson flux-flow oscillators

Journal Article · Mon Sep 01 00:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.5572· OSTI ID:538585

Koshelets, V P; Shitov, S V; Shchukin, A V; Filippenko, L V ^[1]; Mygind, J ^[2]; Ustinov, A V ^[3]

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1. Institute of Radio Engineering and Electronics RAS, Mokhovaya 11, Moscow 103907 (Russia)
2. Department of Physics, Technical University of Denmark, B309, DK-2800 Lyngby (Denmark)
3. Physics Institute III, University of Erlangen-Nuremberg, Erwin-Rommel-Strasse 1, D-91058 Erlangen (Germany)

Flux-flow oscillators (FFO{close_quote}s) are being developed for integration with a SIS mixer for use in submillimeter wave receivers. The present work contains a detailed experimental study of the dc, microwave, and noise properties of Nb-AlO{sub x}-Nb FFO{close_quote}s. A model based on the Josephson self-pumping effect is proposed for an explanation of the experimental current-voltage characteristics. A reliable technique based on harmonic mixing is used to determine the spectral linewidth of the radiation emitted by the integrated FFO{close_quote}s up to 600 GHz. Comprehensive measurements of the dependence of the linewidth on the dynamic resistance and the applied magnetic field have been performed. In the resonant regime a linewidth as small as 200 kHz is obtained at 450 GHz. The experimental data are compared with recent theoretical predictions. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 538585
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 56; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ALUMINIUM OXIDES
JOSEPHSON EFFECT
JOSEPHSON JUNCTIONS
MICROWAVE EQUIPMENT
NIOBIUM
NOISE
OSCILLATORS