Demis D. John

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Demis D. John
Position Prinicpal Development Engineer
Room Number 1109D
Phone (805) 839-5934


Demis John graduated with his Ph.D. in 2012 from the research group of Dr. Daniel J. Blumenthal at UCSB. He worked on creating ultra-low-loss optical waveguides, in close collaboration with the Bowers research group, involving a great deal of materials analysis and fabrication along with optoelectronic simulation. From 2012 to 2017, Demis worked at Praevium Research Inc. where he developed near-infrared and mid-infrared tunable semiconductor lasers for medical imaging and gas spectroscopy, respectively. Combined, Demis has been using the Nanofab since 2006.

Current Work

Demis is knowledgeable in fabrication techniques and troubleshooting processing issues, along with materials characterization techniques and developing new repeatable procedures for fabricating devices. Users are encouraged to ask Demis for help regarding fabrication.

In addition, Demis is handling high-resolution lithography & experimental processing tasks for external users.

Lastly, he is paying attention to usability and user needs in the NanoFab (including websites, procedures etc.), so please notify him of any comments or concerns.


Demis D. John is the supervisor for the following tools: