March 7
@
11:00 AM
–
12:00 PM
2239 Engineering Hall
Sub-monolayer manipulation of diamond surfaces using a two-photon technique
Abstract:
Engineering the termination and defects of diamond surfaces are important for quantum computing and sensing, and electronic applications. Techniques for manipulating the surface include processes based on plasma, chemical, electron and ion beams, and laser treatments. Although laser writing offers a convenient technique for defining complex surface patterns, its applications have been limited due to poor depth resolution and contamination via graphitization. We describe an unusual non-ablative UV laser direct-write technique for manipulating the surface chemistry and etching top-layers with sub-monolayer precision. This effect, which appears to be unique to diamond, is interesting from a surface physics perspective as well as applications in nano-scale engineering of diamond surfaces. The talk will describe the phenomenology of the process, and provide an example of where the process can be used to enhance surface electronics.
Rich Mildren
Biography:
Rich Mildren is a Professor of Physics in the School of Mathematical and Physical Sciences, Macquarie University. His research is in the development of novel and versatile photonic sources, instrumentation and applications. His PhD (1997) and early postdoctoral research (1998-2004) was in the plasma kinetics of high-power gas lasers. During this period, he was a visiting fellow at the National Research Council in Pisa, Italy. For 3 years (2005-2008) he led R&D for a University spin-off company in wavelength-switchable medical lasers, during which time he brought several medical laser products through to the stage of medical device regulatory approval. His most recent focus, conducted in the MQ Photonics Research Centre, is in photonics using advanced materials such as diamond. He has six awarded patents and authored 150+ peer-reviewed journal articles. He was the recipient of the Australian Museum Eureka Award for Outstanding Science for Safeguarding Australia in 2017 and elected an OSA Fellow in 2018.