A new technique is presented which enables the fabrication of highly transparent Josephson junctions in combination with mesoscopic devices. We utilize a modified AFM tip to plough grooves into superconducting material, thus defining a weak link. This weak link is made within the superconducting split-gates, which are used to electrostatically form a conventional quantum dot and serves as a source of millimeter wave radiation around 100 GHz. We show the characteristics of typical junctions built and discuss their high-frequency properties. We find that the millimeter wave emission of the weak link leads to a bolometric effect in the case of quantum point contact spectroscopy.
@article{arxiv.cond-mat/9812150,
title = {Nano-ploughed Josephson Junctions as on-chip Radiation Sources},
author = {B. Irmer and F. Simmel and R. H. Blick and H. Lorenz and J. P. Kotthaus and M. Bichler and W. Wegscheider},
journal= {arXiv preprint arXiv:cond-mat/9812150},
year = {2009}
}
Comments
to appear in the special issue of Superlattices and Microstructures on Mesoscopic Superconductivity (scheduled for May 1999)