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Center for Astrophysics Research and Technologies Seminar Series Information

 

Events Calendar

Designing Spaces for Light

Friday August 18, 2017
11:00 am


 Presenter:  Alexander V. Kildishev Associate Professor of Electrical and Computer Engineering Purdue University
 Series:  OSE Seminars
 Abstract:  After a brief review of previous work based on the innovative methods of transformation optics, I will present a new class of elliptic omnidirectional concentrators focusing light on a disk, a thin strip, or a rod. This study expands the theory of a circular omnidirectional concentrator—an ‘optical black hole’— previously developed by our team, and then experimentally demonstrated at the microwave, at optical spectral bands, and in acoustics. Our ray-tracing and full-wave simulations of new elliptic designs show flawless focusing and absorbing performance at complete acceptance angles. A related most recent study includes a gradient nanofocusing hyperlens employing a cylindrical effective medium theory. Then, focus will be put on new approaches built in a multiphysics computational environment that gives tighter integration between different phenomena involved in light-matter interaction and offers a broader range of new modeling opportunities. For example, numerical modeling of gain-assisted metamaterials and the use of the experiment-fitted numerical models of gain media will be discussed. The quality of the results is greatly improved by incorporating prior background knowledge of quantum physics of the atomic system into the model. Another example is the computationally non-trivial modeling of the interband part of graphene dispersion in time and frequency domains recently developed in my lab. We address this problem by substituting the numerically expensive integration in the Kubo surface conductivity model with closed-form representations, which are significantly more efficient for calculations in time and frequency domains. Existing challenges and several specific research aims for future pursuit will also be outlined.
 Location:  Room 103, Center for High Tech Materials

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