In 1995, Laroussi joined the Microwave & Plasma Laboratory of the University of Tennessee as a research assistant professor.
Laroussi's research interests are in the physical electronics area, particularly in the applications of non-equilibrium gaseous discharges.
In 2009 the Institute of Electric and Electronics Engineers (IEEE) elevated Laroussi to Fellow for his contributions to the biomedical applications of plasmas[3].
This device can generate long plumes or jets of cold plasmas that can be used in various biomedical applications, including in dentistry.
The plasma pencil was the subject of wide media coverage including a mention in an article in National Geographic (February 2006 issue), and ABC online news.