Robert Norwood - Titania-based sol-gels with Tunable Dielectric and Optical Properties

Session 26: Biosensors & the Environment Around Us

Titania-based sol-gels with Tunable Dielectric and Optical Properties
Thursday, June 22, 2017 
3:00 PM - 3:25 PM

We will discuss sol-gel dielelctric materials based on blends of 3-methacryloxypropyltrimethoxysilane (MAPTMS) with a novel titanium dioxide sol-gel produced via an epoxide cataylst starting from titanium tetrachloride. The blended system is flexible, by virtue of the MAPTMS component, and exhibits a low-frequency dielectric constant ranging from 5 to more than 10 based on the composition. These same systems exhibit tunable optical properties, with refractive indices at 1 micron wavelength ranging from 1.5 to 1.9. The titania sol-gel has the benefit of long shelf-life (month) compared to its alkoxide acid catalyzed counterparts (minutes). We report on dielectric and optical properties measurements of these unique systems and consider their application in flexible optoelectronics.  In addition, we discuss the use of these materials for optical waveguide based biosensors; we will discuss the demonstration of such a device for detecting cytochrome-C via evanescent wave absorption.


Speaker's Biography

Robert A. Norwood is a Professor in the College of Optical Sciences at the University of Arizona, where he performs research on photonic materials and devices, specifically high speed electro-optic modulators and switches, RF photonics, silicon photonics, plasmonics, infrared optical polymer materials and devices, magneto-optic materials and devices, polymer-based integrated optics, 3-D display technology, solar energy, nonlinear optical fibers, biologically inspired optical microresonators and ultrafast optical switching among other areas. Prior to his current position, Dr. Norwood spent 15 years in R&D leadership positions in industry at both Fortune 100 corporations (AlliedSignal now Honeywell) and venture-capital backed startups (VP and CTO of Photon-X). He is a world expert in polymer integrated optics and optical materials, with more than 165 refereed publications, 7 book chapters, 35 issued US patents, and 70 invited talks. Dr. Norwood has served as a conference chair or co-chair for Organic Thin Films for Photonic Applications (OSA/ACS) and Linear and Nonlinear Optics in Organic Materials (SPIE), and has served on the program committee for OFC (sub-committee chair); he has just started his second three year tenure on the CLEO (OSA) program committee. He is an associate editor of Optica and has previously served as an Associate Editor of IEEE Photonics Technology Letters and Optical Materials Express. He is both an OSA Fellow and an SPIE Fellow, as well as a member of APS and IEEE. He holds the Ph. D. in physics from the University of Pennsylvania, and the B.S. in physics and mathematics from MIT.


Robert Norwood
University of Arizona