Research output: Patent


Nonlinear Optic Glassy Fiber with Strong Intrinsic Second Harmonic Generation NU 2007-166 and 2009-048 Inventors In Chung Mercouri Kanatzidis* Abstract While most second harmonic generation (SHG) materials are oxide compounds, they are inefficient in the infrared (IR) region because of issues with absorption. Northwestern researchers have developed nonlinear optic (NLO) glassy fiber and thin film technology that effectively produces coherent light at frequencies where lasers perform poorly or are unavailable. The high-quality optical glassy fiber is made from a melt of alkali metal selenophosphate ternary compounds and can easily be drawn out to multiple meters in length and a few to a hundred microns in thickness. The optical glassy fibers and thin films outperformed any known NLO materials, exhibiting strong waveguided second harmonic generation response along the fiber. The nonlinear optical response was present without the application of electric fields (poling) to the fibers and generated a frequency-mixing signal of difference frequency generation (DFG) continuously in a wide range of visible/IR light. The NLO films are inexpensively and conveniently produced and can be deposited from solution, making the material useful for many applications. Applications o Secure communication: textual and/or graphical information storage for a prescribed period of time Advantages o Inexpensive and convenient o Strong intrinsic SHG using non-centrosymmetric chalcophosphate materials o Good wave-mixing performance without the need for poling o Functionality in the visible and the near IR region o Extremely flexible fibers o Solution-processable films IP Status Issued US Patent Nos. 8,143,181 and 8,351,109 Marketing Contact Chao Zhang, Ph.D. Invention Associate (e) (p) 847.491.4629
Original languageEnglish
Patent number8143181
StatePublished - Nov 18 2010


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