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UBC Theses and Dissertations

Powder filters for a dilution fridge scanning tunneling microscope Quentin, Damien Charles


In this thesis I present the design, construction, and characterization of metal powder microwave filters for a dilution refrigeration scanning tunneling microscope (STM) in the Laboratory for Atomic Imaging Research at the University of British Columbia. Scanning tunneling spectroscopy (STS) measurements performed by the STM are able to reveal features in the local density of states with energy resolution in the μeV regime if the sample and tunnel junction are cooled below 100 mK. The filters described in this work eliminate thermal noise and electromagnetic interference, which decrease energy resolution in STS measurements, up to seemingly indefinite frequency by exploiting the tremendous effective surface area of the metal powder which dissipates radio-frequency power via eddy currents induced in the grains.

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