Date: Tuesday, April 29, 2014
Time: 11:00 am
Speaker: Prof. Kevin Webb, Purdue University
Title: Nanostructured Materials for Optical Sensing, Control and Signal Processing
Location: 67-3111 Chemla Room
I summarize some of our recent accomplishments related to metamaterials, including the proposal of a graphene stack as the blackest material. Relying on fundamental principles, I suggest opportunities for the synthesis of new material mixtures, including active materials that have desirable properties for optical and optoelectronic applications. I explore concepts for optical magnetism, based upon a homogenized definition.
Following a review of plasmonic waveguides and cavities, I describe irregular scattering structures that offer a large number of degrees of freedom and new opportunities for optical signal processing. Strong scatter provides field enhancement and control opportunities where homogenization is not meaningful.
I review the description of optical forces and the influence of material properties. I present the first force model to explain the key 1978 radiation pressure experiments of Jones and Leslie, in particular, that the measured force on a mirror is proportional to the background refractive index. This may resolve a century-old dilemma regarding optical momentum. Exploiting our recent experimental nanophotonics work, I provide example structures with favorable properties. Applications may include nanoparticle manipulation and cell mechanotransduction studies.