Lithium niobate has numerous extraordinary features that make it useful for a wide range of applications, particularly in optics. The material's strong electro-optic effect and second-order nonlinearities are two prime examples with applications in optical modulation and wavelength conversion, respectively. The thin-film lithium niobate platform has revitalized the conventional applications of lithium niobate during the last decade. The platform is now one of the most actively investigated subdisciplines in integrated photonics. The waveguides on this innovative platform are high index contrast, resulting in a size reduction of more than 20 times and a bending radius decrease of about two orders of magnitude when compared to traditional counterparts. These ultracompact waveguides facilitate the realization of highly efficient photonic devices, some of which are presented in this work. First, tunable dual-channel integrated Bragg filters with ultra-narrow linewidths are demonstrated. These filters have potential applications in optical communication, sensing, and quantum optics. Next, high-speed Mach-Zehnder electro-optic modulators with an extrapolated 3-dB bandwidth of 170 GHz and low half-wave voltage-length product of 3.3 V.cm are presented. Furthermore, microwave-to-optical converters with integrated antennas and optical waveguides are demonstrated with improved efficiency compared to the currently existing devices for integrated microwave photonics applications. Afterward, fabricated periodically-poled lithium niobate devices are utilized to illustrate nonlinear wavelength translators through cascaded sum- and difference-frequency generations. Finally, further works on these research topics, which are appropriate for future research, are discussed.
| Identifer | oai:union.ndltd.org:ucf.edu/oai:stars.library.ucf.edu:etd2020-2567 |
| Date | 01 January 2022 |
| Creators | Gholipour Vazimali, Milad |
| Publisher | STARS |
| Source Sets | University of Central Florida |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Electronic Theses and Dissertations, 2020- |
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