Josephson-junction arrays as high-efficiency sources of coherent millimeter-wave radiation

Authors
Vasilic, B Shitov, SV Lobb, CJ Barbara, P
Citation
B. Vasilic et al., Josephson-junction arrays as high-efficiency sources of coherent millimeter-wave radiation, APPL PHYS L, 78(8), 2001, pp. 1137-1139
Citations number
14
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
00036951 → ACNP
Volume
78
Issue
8
Year of publication
2001
Pages
1137 - 1139
Database
ISI
SICI code
0003-6951(20010219)78:8<1137:JAAHSO>2.0.ZU;2-9
Abstract
Recent experiments have indicated that Josephson-junction arrays can radiat e coherently in a laser-like fashion, as predicted by theoretical work in t he 1970s. We present results from measurements of high-efficiency Josephson -junction arrays coupled to resonant cavities. In one of our samples with f our columns and 36 rows, the dc to ac (180 GHz) conversion efficiency reach es an asymptotic value of about 32%. Using a simple circuit model we show t hat we have achieved optimal dc to ac conversion in this sample. (C) 2001 A merican Institute of Physics.