Events Calendar

Two Applications of Computational Electromagnetics: ...

...Moving Objects with the Force of Light and Improving Solar Cell Performance. Speaker: Dr. Michelle L. Povinelli, Ming Hsieh Department of Electrical Engineering, University of Southern California Abstract: In the first part of the talk, I will discuss how light can be used to move and reposition microscale objects. Our work has demonstrated novel applications of optical forces within integrated microphotonic devices-a type of "optical circuits" that use light rather than electrons to carry information. I will present designs for devices that rotate the polarization of light by taking advantage of light forces. In the second part of the talk, I will discuss how computational electromagnetic modeling can be used to design higher-efficiency solar cells. We calculate the optical absorption of vertically aligned silicon nanowire arrays. We optimize the ultimate efficiency of the solar cell with respect to filling ratio and lattice constant. We identify two enhancement mechanisms, an increase in field concentration within the nanowire and the excitation of guided resonance modes. Our results show that an optimized silicon nanowire array can have higher efficiency that a solid thin film. Michelle Povinelli is an Assistant Professor of Electrical Engineering and holder of the WiSE Jr. Gabilan Chair at the University of Southern California. She is a recipient of a NSF CAREER Award and an Army Young Investigator Award. She received a BA from the University of Chicago, an MPhil from the University of Cambridge, where she studied as a Churchill Scholar, and a PhD from the Massachusetts Institute of Technology, all in Physics. She completed postdoctoral research in the Electrical Engineering Department at Stanford University and was selected as one of five national recipients of a L'Oreal For Women in Science Postdoctoral Fellowship. She has co-authored over twenty-five refereed journal articles and holds two US Patents.

Location: Kaprielian Hall (KAP) - 209

Audiences: Everyone Is Invited

Contact: Evangeline Reyes