10/27/16 -9:45 AM to 11:00 AM
Department Seminar: Professor Jennifer Shumaker-Parry
"Plasmonic Architectures for Nanoscale Manipulation of Electric and Magnetic Fields"
Metal nanoparticles exhibit unique optical properties due to the localized plasmonic response in the presence of light. The strong dependence of plasmons on structural properties means metal architectures can be designed to manipulate electric and magnetic fields on a remarkably small size scale. Engineering plasmonic nanostructures for controlled light-matter interactions has been a major research focus due to broad implications for chemical and biological sensing, photovolta- ics, and subwavelength and nonlinear optical effects. We pursue simple approaches to nanoparticle fabrication that lead to plasmonic architectures with broadly tunable optical properties. Aluminum as a plasmonic material exhibits optical and material properties that are advantageous as compared to the more typically used gold and silver. However, one of the challenges of using aluminum is that it rapidly forms a terminal oxide layer that complicates fabrication and limits structural control. A new modified nanosphere template lithography process provides a highly versatile approach to aluminum plasmonic architectures with broadly tunable spectral responses from the ultraviolet to the infrared. The ability to access unique architectures as well as applications of these plasmonic structures in surface enhanced infrared absorption spectroscopy and circular dichroism spectroscopy will be discussed.
Professor Shumaker-Parry's research efforts are focused on the development of plasmonic structures and nanoparticle assemblies with tunable optical properties and surface plasmon resonance-based sensing and spectroscopy platforms, particularly for biomolecule analysis. Her group's projects can be divided into three main areas:
- tunable plasmon-based sensing and spectroscopy platforms based on structural control and organized nanoparticle assembly;
- solution-based synthesis of metal nanoparticles using novel reducing agents that serve dual roles and provide additional control of materials properties; and
- label-free, high-throughput bioassays based on surface plasmon resonance microscopy.