Cooperative Institute for Research in Environmental Sciences

ESOC Weekly Coffee

ESOC Weekly Coffee

Special Speaker: Integrated optics for mid- and long-wavelength sensing
Presented by: Juliet T. Gopinath & Wounjhang Park


Recently, ultrafast and nonlinear integrated devices have captured interest for frequency metrology, sensing, and imaging.  An excellent platform for nonlinear optical devices is offered by chalcogenide glasses, which contain a chalcogen element such as S, Se or Te covalently bonded to one or more elements.   These materials have many favorable attributes including high nonlinearities, long wavelength transparencies up to 20 mm, flexible substrate choice, and low nonlinear absorption.  

In particular, Ge28Se12Sb60  chalcogenide material is attractive due to its As-free composition, stability, large nonlinearity and high glass transition temperature of 300 oC.  Progress on integrated optical devices for the near, mid, and long-wavelength infrared is presented, including nonlinear optical characterization of bulk and thin-film samples, waveguides, and resonant structures.  These devices are particularly promising for sensing and as flexible optical sources.

Additionally, miniature diode-based laser systems as well as light with orbital angular momentum will be discussed for sensing applications.


Biography: Juliet Gopinath is an Associate Professor of Electrical, Computer and Energy Engineering at the University of Colorado Boulder.   She received her B.S. degree in Electrical Engineering from the University of Minnesota and her M.S. and Ph.D. degrees at MIT.   She worked at MIT Lincoln Laboratory from 2005 to 2009 on topics including cryogenic Yb:YAG lasers, beam combining, and mode-locked diode lasers.   Her current research interests include ultrafast lasers, nonlinear optics, mid-infrared materials, spectroscopy, orbital angular momentum and adaptive optical devices.   She is the recipient of an Air Force Young Investigator Award (2010), R & D 100 Award (2012), an NSF CAREER award (2016), and is an Associate Editor for IEEE Photonics Journal.

Biography: Wounjhang (Won) Park received his Ph.D. from Georgia Institute of Technology. He then worked as Post-Doctoral Fellow and Research Scientist II at the Georgia Tech Research Institute until he joined the faculty of University of Colorado Boulder where he is currently N. Rex Sheppard Professor of Electrical, Computer and Energy Engineering, Materials Science and Engineering Program and University of Colorado Cancer Center. Dr. Park’s research interest is mainly in the light-matter interaction in nanostructures. Current research focuses on the thermal radiation engineering for energy harvesting, plasmonic nanostructures for cancer detection and therapy and mid-infrared photonic devices. Dr. Park has published over 100 peer-reviewed technical articles and 4 invited book chapters and holds 5 U.S. patents. He is the recipient of Ruth L. Kirschstein NRSA Senior Fellowship in Cancer Nanotechnology from the National Institute of Health, the Provost’s Faculty Achievement Award and Sheppard Faculty Fellowship from the University of Colorado Boulder and Changbai Scholar Award from the Chinese government.


Thursday, October 19, 2017
9:00am to 10:00am


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