Matthew J. Dejneka

Title:  Chemically strengthened glasses and glass-ceramics

Abstract:  Glass is scratch resistant, strong, and chemically durable, making it ideal for touch screens and covers for displays. Unfortunately, the strength of most glasses can be quickly degraded to less than 1% of its theoretical strength by handling due to the introduction of flaws which act as stress concentrators.  We developed fusion formable glasses that can be ion exchanged to 800MPa compressive stress on the surface and achieve 50 microns depth of compression which better retain the strength of the pristine fusion surface after handling and use.  We then discovered glasses with intrinsically superior damage resistance that withstood even greater loads before flaws could be introduced.  These glasses have now been used to help protect more than 4.5 billion devices worldwide.  Finally, we made the first fusion formable glass-ceramics and devised methods to pattern them without sacrificing strength.

Biography:  Matthew J. Dejneka is a research fellow in Corning’s Glass Research group in Corning, NY.  Matt earned a Ph.D. in Ceramic Science and Engineering under the auspices of a National Defense Science and Engineering Fellowship at Rutgers University in 1995 and joined the glass-ceramics research group at Corning.  He received the 2004 Weyl International Glass Science Award for his innovative work on transparent, ferroelectric, and magnetic glass ceramics, tapered fiber lasers, compositions for optical amplifiers, rare earth doped fluorescent microbarcodes, and negative thermal expansion ceramics.  Working with his colleagues, he invented transparent LaF₃ glass ceramics, passivation coatings for CaF₂ excimer laser optics, high strain point LCD display glasses, and an all fiber filter to suppress multi path interference in Erbium doped fiber amplifiers. Matt developed new fiberization techniques for soft glass and used these novel methods to make fiber lasers and broad band amplifiers. He co-invented the tapered fiber laser and fabricated high NA rectangular core Ytterbium doped fibers that delivered 1W of 980 nm single mode output. In 2005 he earned the Karl Schwartzwalder Professional Achievement in Ceramic Engineering (PACE) Award.  Matt has organized seven sessions, one symposium, and the 2006 Glass & Optical Materials Division Meeting.  He also served as president of Keramos from 2004-2006 and has been a member of ACerS since 1988.

Currently he is investigating chemically strengthened glasses and is a co-inventor of Corning^® Gorilla^® Glass which has been used to protect 4.5 billion devices.  He is the author or co-author of 40 papers and holds 44 patents.