Abstract
Silicon has proven to be one of the materials of choice for many integrated photonic applications. However, silicon photonics is limited by certain material shortcomings. Two shortcomings addressed in this work are zero second-order optical nonlinearity, and the lack of methods available to achieve broadband polarization diversity. Heterogeneous integrated solutions for these shortcomings of silicon photonics are presented in this work. First, nonlinear frequency conversion is demonstrated with thin-film lithium niobate on silicon substrates. The method for reaching the highest-achieved second-harmonic generation conversion efficiency, using active monitoring during periodic poling, is discussed. Additionally, a cascaded approach for generating higher-order harmonics is presented, along with a theoretical model to extract conversion efficiencies from measurements performed with pulsed sources. Initial work to integrate second-order and third-order nonlinearities together using thin-film lithium niobate and chalcogenide is also presented. Second, a spatially-mapped anisotropic material platform that exhibits broadband polarization diversity is discussed. This platform currently demonstrates polarization beam splitters, and polarization-selective beam taps and microring resonators, whose results are presented. Also discussed is a method to include polarization rotators to demonstrate full polarization diversity, as well as designs and initial work to expand the platform to operate at longer wavelengths, specifically those in the telecom band.
Notes
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Graduation Date
2020
Semester
Summer
Advisor
Fathpour, Sasan
Degree
Doctor of Philosophy (Ph.D.)
College
College of Optics and Photonics
Department
Optics and Photonics
Degree Program
Optics and Photonics
Format
application/pdf
Identifier
CFE0008241; DP0023595
URL
https://purls.library.ucf.edu/go/DP0023595
Language
English
Release Date
August 2020
Length of Campus-only Access
None
Access Status
Doctoral Dissertation (Open Access)
STARS Citation
Sjaardema, Tracy, "Heterogeneous Integrated Photonics for Nonlinear Frequency Conversion and Polarization Diversity" (2020). Electronic Theses and Dissertations, 2020-2023. 292.
https://stars.library.ucf.edu/etd2020/292