We report the characterisation of printed circuit boards (PCB) metal powder filters and their influence on the effective electron temperature which is as low as 22 mK for a quantum dot in a silicon MOSFET structure in a dilution refrigerator. We investigate the attenuation behaviour (10 MHz- 20 GHz) of filter made of four metal powders with a grain size below 50 um. The room-temperature attenuation of a stainless steel powder filter is more than 80 dB at frequencies above 1.5 GHz. In all metal powder filters the attenuation increases with temperature. Compared to classical powder filters, the design presented here is much less laborious to fabricate and specifically the copper powder PCB-filters deliver an equal or even better performance than their classical counterparts.
@article{arxiv.1304.3306,
title = {Printed Circuit Board Metal Powder Filters for Low Electron Temperatures},
author = {Filipp Mueller and Raymond N. Schouten and Matthias Brauns and Tian Gang and Wee Han Lim and Nai Shyan Lai and Andrew S. Dzurak and Wilfred G. van der Wiel and Floris A. Zwanenburg},
journal= {arXiv preprint arXiv:1304.3306},
year = {2013}
}
Comments
13 pages, 5 figures, accepted for publication in Rev. Sci. Instrum