Matt Sfeir is an Associate Scientist in the Center for Functional Nanomaterials at Brookhaven National Laboratory. His research involves the development and application of broadband optical probes to nanomaterial based solar energy applications. The Advanced Optics Facility at Brookhaven's Center for Functional Nanomaterials combines a broad range of optical instruments suitable for studies of optical properties of hard, soft or biological materials using ultrafast and nonlinear spectroscopy, and single-molecule optical and confocal methods.