Jieying (Amaya) Mao Wednesday, March 7, 2018 1:00 PM (219 JFB)
Title: Plasmonic Enhancement Via Metallic Nanostructures in Ultraviolet Visible Region
Metallic nanostructures have been studied for their ability to support surface plasmons, the collective oscillations of conduction band electrons, which provides numerous ways to control and manipulate light at the nanoscale. Highly confined resonance with field enhancement can be achieved and readily tuned by manipulation of the nanostructure shape, texture and material composition. However, extending the plasmonics response into the ultraviolet (UV) has encountered significant challenges in both engineering (nanostructure design, optimization, and fabrication) and materials science (detailed composition analysis). Therefore, motivated by its tremendous potential in the biochemistry and photochemical applications, this presentation focuses on the advancement of UV Plasmonics in terms of metallic nanostructure design, fabrication and material characterization.
This talk will be itemized into two main categories - materials and nanostructures. First is the evaluation of the plasmonic material properties of aluminum (Al) and magnesium (Mg), along with the use of these materials in common plasmonic nanostructures. The Extraordinary Optical Transmission (EOT) through Al and Mg nanohole array is compared and the impact of Focused Ion Beam (FIB) lithography method is qualitatively analyzed based on the sample elemental analysis. Al turns out to be the most applicable plasmonic metal in the UV even compared with Mg.
Focusing on Al, I will move on to the next category that discusses four other plasmonic nanostructures to achieve UV nano-focusing - the V-groove geometry, nano-crescent antenna array coupled to a ground plane, and two variations on a 3D nano-cavity antenna array. Engineering methology is discussed for plasmonic nanostructure design, optimization and fabrication that results in significant enhancement of the resonance field by factors greater than 100.