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==Research==
While working for the [[Ministry of Defence (United Kingdom)|Ministry of Defence]], Hilsum helped develop commercial applications for [[gallium arsenide]], and was responsible for creating the UK's first [[semiconductor laser]]. He was one of the developers of the
[[Ridley Watkins Hilsum theory|Ridley-Watkins-Hilsum theory]] that provided the theoretical basis of the [[Gunn diode]],<ref>{{cite web|url=http://www.mwrf.com/Articles/Print.cfm?ArticleID=19913|title=Cyril Hilsum|access-date=13 November 2008|url-status=dead|archive-url=https://web.archive.org/web/20110714141532/http://www.mwrf.com/Articles/Print.cfm?ArticleID=19913|archive-date=14 July 2011|df=dmy-all}}</ref> and his research helped form the basis of modern [[LCD]] technology,<ref>{{Cite journal|url=http://www.lcd-displays-manufacturers.com/suserfiles/upload/lcd_history_blaze_display.pdf|title=The history of liquid-crystal displays|archive-url=https://web.archive.org/web/20130121144533/http://www.lcd-displays-manufacturers.com/suserfiles/upload/lcd_history_blaze_display.pdf |archive-date=21 January 2013|url-status=dead|first=Hirohisa |last=Kawamoto|journal=Proceedings of the IEEE|volume=90|number=4|date=April 2002|pages=460–500 |doi=10.1109/JPROC.2002.1002521 }}</ref> bringing in over £100m to the UK government. The [[British Liquid Crystal Society]] awards a Cyril Hilsum Medal each year "to British candidates for overall contributions to liquid-crystal science and technology. The award is made to mid-career scientists who have made notable contributions to the subject over a number of years."<ref>{{cite web|url=http://www.ucl.ac.uk/news/news-articles/0804/08043004|title=Cyril Hilsum Medal awarded|date=30 April 2008|access-date=13 November 2008}}</ref>
==Personal life==
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