Photovoltaic Energy Harvesting and Infrared Spectral Filtering
Location:356 Fitzpatrick Hall
Office: 226B Cushing Hall
Conversion of light to electricity via photovoltaic cells has had a profound impact on power generation, primarily for solar energy generation. Photovoltaics can also provide a highly efficient means of energy scavenging for miniaturized systems that enable the ‘internet of things’ and applications including implantable medical devices. In this presentation, the application of GaAs-based photovoltaic cells to power mm-scale computing systems will presented, providing a means to harvest energy based on ambient indoor lighting. Details of the optimization of energy harvesting for indoor lighting spectrum, and special challenges for harvesting under low-flux conditions will be discussed. Initial experiments to further apply these photovoltaic cells for through-tissue harvesting of infrared energy to power implantable mm-scale wireless sensor nodes will be described as a potential breakthrough technology in the medical field. In a separate topic, infrared imaging enables many applications in defense, security, spectroscopy, astronomy, and remote sensing. Advanced imaging systems desire the ability to tune optical response at the pixel level, where tunable narrowband response would enable hyperspectral imaging. Sub-wavelength dielectric gratings offer a means to achieve narrowband response by providing a broadband high-reflectivity background, and coupling to an optical mode that provides sharp, narrowband transmission. The design and experimental demonstration of these narrowband filters will be presented.
Professor Jamie Phillips
The University of Michigan, Ann Arbor, MI
Jamie Phillips is an Arthur F. Thurnau Professor of EECS at the University of Michigan. He received his B.S., M.S. and Ph.D. degrees in Electrical Engineering at the University of Michigan. He was a postdoctoral researcher at Sandia National Labs from 1998-1999 and research scientist at the Rockwell Science Center from 1999-2001 before returning to the University of Michigan as a faculty member in 2002. His expertise is in the growth, characterization, and device applications of compound semiconductor and oxide-based materials for optoelectronics and electronics where he has published more than 120 peer-reviewed articles. Prof. Phillips received an NSF CAREER award, DARPA MTO Young Faculty Award, IEEE Paul Rappaport Award, EECS Outstanding Achievement Award, and University Undergraduate Teaching Award.