- Kevin Roccapriore, The University of North Texas, Denton
Various nanostructured materials can display unique and interesting optical properties if engineered in an appropriate manner. First, one-dimensional and two-dimensional subwavelength optical metamaterials are fabricated and characterized, and their properties and applications, such as grating coupling, are investigated. These devices interestingly can effectively exhibit magnetism at optical frequencies and even negative refraction; however, their general characterization at oblique incidence is challenging due to diffraction. The speaker will (1) present a new method of characterization that takes into account diffraction and (2) explain how surface plasmon resonance (SPR) was used experimentally for the first time in two schemes to determine the behavior of the transition layer between a metal and a dielectric. The physics of interfaces, namely the singularity of electric permittivity and how it can be shifted, becomes clearer owing to the extreme sensitivity of SPR detection mechanisms. Ultra-thin two-dimensional semiconducting materials will have their lifetimes analyzed and characterized by number of atomic layers and by applied voltage biasing.