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High Impact Research: Infrared Lenses

Tuesday, November 2, 2021

Chalcogenide Ge-As-Pb-Se nanocomposites are used as a testbed infrared material to validate that APT provides critical microstructural information in a 3-D space, enabling the prediction of optical properties which closely match experimental data.

Imaging systems intrinsically suffer from chromatic aberration, and multi-element lens systems often made of high-density crystalline materials are commonly employed to solve the issue. However, this can lead to an increase in the size, weight, power consumption, and cost of the imaging system. Meanwhile, lenses within the eyes of living organisms have gradient refractive index (GRIN) profiles which remove much of the chromatic aberration. Hence, one can envision solid state optics based on lightweight GRIN lenses with minimal chromatic aberration. Ge-As-Pb-Se chalcogenide materials have been shown to be promising for the formation of GRIN profiles realized through the formation of high refractive index nanocrystals in a parent glass matrix.

In this talk, we present novel fabrication routes employing photo/thermal processes which enable spatial control of effective refractive index. We demonstrate the use of atom probe tomography (APT) as a suitable three-dimensional (3-D) metrology tool
greatly refining the optical material system’s process-structure-property relationship, thereby expecting to facilitate the development of flat optics-based platforms.

About the presenter:

Dr. Myungkoo Kang is currently a research scientist in the Glass Processing and Characterization Laboratory led by Pegasus Professor Kathleen A. Richardson at CREOL, the College of Optics and Photonics at the University of Central Florida.

Prior to joining UCF, he earned his Ph.D. in materials science and engineering under the supervision of Professor Rachel S. Goldman at the University of Michigan and worked as a postdoctoral research fellow under co-supervision of Distinguished Professor Theresa S. Mayer (electrical engineering) and Distinguished Professor Carlo G. Pantano (materials science and engineering) at the Pennsylvania State University.

Dr. Kang’s research has focused on the utilization of irradiation processes and cutting-edge microstructural/optical metrologies for chalcogenide glass and compound semiconductor systems to create novel nanocomposites with spatially-tunable microstructure and optical properties that are desirable for next generation optical, plasmonic, and optoelectronic platforms.

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