The University of Iowa


IMPORTANT: The Optical Science and Technology Center and Microfabrication Facility are being retired after fall 2018 and their services reconfigured under the new Iowa Center for Research, Exploration, and Advanced Technology in Engineering and Sciences (Iowa-CREATES) and Materials Analysis, Testing, and Fabrication (MATFab) in the Iowa Advanced Technology Laboratories (IATL) in spring 2019. As a result, the OSTC/UIMF site will eventually be taken down. Until then, please visit the Iowa-CREATES Website at https://iowacreates.research.uiowa.edu/, or read more about the new center at https://research.uiowa.edu/impact/news/ui-gears-new-improved-research-center-engineering-and-physical-sciences.

OSTC

Optical Science and
Technology Center

OSTC Colloquium, Prof. Fatima Toor

Prof. Fatima Toor, Department of Electrical and Computer Engineering, University of Iowa
IATL 104 - Large Conference Room

“High Performance Optoelectronics for Chemical Sensing and Energy Generation Applications"

Prof. Fatima Toor, Department of Electrical and Computer Engineering, University of Iowa

The field of optoelectronics is evolving fast with technology development ranging from medical diagnostics to energy generation. In this talk I will present research on high performance optoelectronics relevant to environment, health, security, and energy applications. The technologies discussed will include spectrally high performing mid-infrared (mid-IR) quantum cascade lasers (QCLs), near-perfect mid-IR metamaterial absorbers, and “black silicon” photovoltaic solar cells.

Prof. Toor will begin with presenting two design techniques to achieve spectral high performance in QCLs, which is required for advanced optical sensors. These techniques include (i) design of a compact four wavelength (l = 7.0 µm, 8.7 µm, 11.2 µm and 12.0 µm) QCL source that is operated using a single power supply, and (ii) and a time and wavelength multiplexing QCL system design with laser emission at l = 8.6 µm and 10.2 µm. Prof. Toor will also present on a near perfect mid-IR dual-band (l = 3.3 µm and 3.9 µm) metamaterial absorber with applications in optical coatings, high efficiency thermal detectors, and spectrally selective detection of molecules. These two technologies will enable high sensitivity and specificity optical sensors for a variety of applications. Next presentation for design of a high efficiency “black silicon” photovoltaic solar cell that utilizes geometric optics to achieve extremely low surface reflectivity. This two technology will reduce manufacturing costs and improve reliability of solar electricity generation.