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Two Dimensional Materials : New Oppertunities in Photonics

Author:
Janisch, Corey
Published:
[University Park, Pennsylvania] : Pennsylvania State University, 2016.
Physical Description:
1 electronic document
Additional Creators:
Liu, Zhiwen
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Open Access.
Summary:
Silicon and silica optical systems have become the primary materials of choice for visible and near-infrared optical devices. However, these materials inherently lack a direct band gap and their crystal symmetry limits second-order optical nonlinearity. In order to make next-generation system-on-a-chip devices, other materials must be incorporated into the system to integrate these properties into the system. To minimize propagating wave perturbations in the pre-existing system, these materials should be made as small as possible, fundamentally limiting light-matter interaction. However, new classes of two-dimensional materials that have been recently been discovered possessing both excellent optical properties, such as extraordinary nonlinear susceptibility, and an atomic thickness, making them excellent candidate materials to integrate into optical systems lacking these properties.This dissertation covers work done to characterize and engineer the optical properties in two-dimensional (2D) materials in an effort to integrate them in optical systems. First, a brief introduction is provided in Chapter 1. Chapter 2 discusses the extraordinary second harmonic generation (SHG) in mono- and few-layered Transition Metal Dichalcogenides (TMDs). It is discovered that monolayer TMDs have susceptibilities over three orders of magnitude larger than typical nonlinear crystals. This work is expanded in Chapter 3, where by synthesizing alloy TMD monolayers, we can tune the monolayer nonlinear susceptibility, allowing further opportunities for engineering 2D materials for optical applications. Chapter 4 covers a method to enhance the light-matter interaction in 2D materials by utilizing a simple nanocavity substrate. Using this simple MoS2/Al2O3/Al substrate, we can optimize the monolayer absorption and emission by tuning the oxide thickness layer, increasing the exclusive MoS2 absorption. In order to further increase this light-matter interaction with 2D materials, monolayers must be integrated into higher Q cavities. To demonstrate stronger light-matter enhancement capabilities of ultra-high-Q microresonators, Chapter 5 describes a method to enhance the particle detection capabilities of microresonators using Raman spectroscopy, demonstrating particle detection and characterization capabilities that could become an excellent platform to further increase the light-matter interaction with 2D materials. Finally, Chapter 6 concludes the dissertation by looking forward to future capabilities of 2D and microresonator systems.
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Dissertation Note:
Ph.D. Pennsylvania State University 2016.
Reproduction Note:
Microfilm (positive). 1 reel ; 35 mm. (University Microfilms 13871840)
Technical Details:
The full text of the dissertation is available as an Adobe Acrobat .pdf file ; Adobe Acrobat Reader required to view the file.
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