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    Enhancing Light-matter Interaction in Ultrathin Films using Optical Nanostructures

    Wang, Wenyi
    : https://etd.library.vanderbilt.edu/etd-03282016-105353
    http://hdl.handle.net/1803/11630
    : 2016-04-09

    Abstract

    Ultrathin films including two-dimensional materials and transparent conductive oxide nano-films are excellent candidates for future optoelectronic devices. However, external quantum efficiencies of the ultrathin film-based devices are typically limited due to their small physical thickness. The practical application of these ultrathin films therefore requires integration with optical nanostructures to enhance light-matter interaction in the thin films. In this work, I will present my efforts to modify the interaction between light and ultrathin films using different approaches, including hot electron injection, integration with Fano-resonant photonic crystals, and use a hybrid mode combining an epsilon-near-zero mode with a Huygens’ dielectric metasurface. The optoelectronic devices demonstrated based on these integrations result in significant increases in absorption, photoresponsivity, and modulation depth.
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