Title of dissertation: BROADBAND PHOTODETECTION IN GRAPHENE Xinghan Cai, Doctor of Philosophy, 2015 Dissertation directed by: Professor, Michael S. Fuhrer, Department of Physics Graphene, a single-atom-thick plane of carbon, has unique optoelectronic properties that result in a variety of potential photonic applications, such as optical modulators, plasmonic devices and THz emitters. In this th...

Abstract Semiconductor-based sub-wavelength metasurfaces are promising device platforms for the realization of optically thick and electrically thin photodetectors. Strong light–matter interactions in ultrathin film regions provide an opportunity to achieve near-unity absorption dimensions comparable with carrier diffusion length this, turn, leads efficient collection photogenerated carriers. M...

We show that bipartite Bell inequalities based on the Einstein-Podolsky-Rosen criterion for elements of reality and derived from the properties of some hyperentangled states allow feasible experimental verification of the fact that quantum nonlocality grows exponentially with the size of the subsystems, and Bell loophole-free tests with currently available photodetection efficiencies.

β-Ga2O3 is a next-generation, ultra-wide bandgap semiconductor with intrinsic solar-blindness having the potential to replace Si for photodetection applications especially UV-C range. The material itself shows excellent photoconductive gain but quite prone menace of persistent photoconductivity, or PPC. fabricated devices become slower because PPC and it also leads reliability issues logic. Her...