Professor Chris Stevens

Associate Professor in Engineering Science St. Hugh's

Status: Associate Professor in Engineering Science

College: St. Hugh's

Email:

Bio photoI originally qualified as a Physicist in 1994 and moved to Engineering in 1998 with a Royal Accademy of Engineering Senior Research Fellowship. Since 2000 I have been a fellow of St Hugh's college and a fellow in Engineering Science. I teach a wide range of subjects in electronics and electromagnetics along with courses on advanced quantum materials and superconducting materials and devices.



Research Activities

Metamaterial Devices

hexagonal metamaterial lens plate
Over the last ~15 years a gradual increase in interest in the applications of metamaterials has spawned a new research interest here in the development of Magneto-Inductive Wave Devices  for a variety of high frequency applications including NMR microscopy, Ultra High Q RF filters and Ground penetrating Radar.  In particular I am  very interested in the development of MIW structures as data connectors, power distribution networks and for electrical machinery.

 

Ultrafast Electronicsht1

My original research area is Ultrafast Electronics which is a rather catch all term for research into the ultimate speed for electronic devices and systems. This field engages a wide range of disciplines and requires expertise in RF circuit layout, condensed matter physics, superconductivity, quantum properties of matter and materials science. In order to evaluate the performance of ultrafast electronic systems we have to develop new methods for analysing electromagnetic signals.Much of the work in the group to date has centred on the development of new techniques with which to investigate circuit performance at >100GHz speeds where conventional circuit analysis techniques are impossible to implement. We have developed methods for current and Photokinetic Sampling and the ultrafast STM (funded by the Royal Society) which enables probing of nanoscale electronic components with sub picosecond time resolution. Current work includes te development of a Terahertz impedance analyser.

Communicationsuwb

In addition to our work on electronics we are also very active in the allied area of ultrawideband (UWB) communications and electromagnetics with current projects investigating the propagation of UWB signals in a variety of environments. One significant area is the development of wireless backplane technologies for small and medium scale electronics assemblies. Typical cost for back-planes in mobile base stations for instance is often in excess of $4000. Removing the need for this component increases flexibility and reduces costs.

We have a strong interest in the imaging possibilities presented by UWB signals and systems, particularly from the high contrast nature of their interaction with living tissue which has spurred a new research area in UWB medical imaging.

I am also active in low frequency electromagnetics with projects in contactless power transfer and TSS- Oxford KTP Project: Submarine Electromagnetics and Ultra-wideband communications.

When not doing science I like to float about underwater.


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