ORCID

0009-0004-3534-7386

Keywords

Integrated Photonics, TFLN, Fabrication, Nonlinear optics, Electro-optics, Ultra low loss

Subject Categories

Optics | Other Neuroscience and Neurobiology

Abstract

Thin-film lithium niobate (TFLN) has emerged as a powerful platform for integrated photonics, combining the exceptional electro-optic, nonlinear, and optical properties of bulk lithium niobate with the scalability and compactness of planar nanophotonic technologies. Building on these principles, advanced device architectures such as adiabatic dichroic filters have demonstrated exceptional spectral performance spanning over two octaves of bandwidth on the TFLN platform. Beyond reciprocal devices, it also offers promising pathways toward integrated nonreciprocal components. By leveraging broadband filtering structures and advanced nonlinear photonic design strategies, compact and monolithic optical isolators can be envisioned without relying on traditional magneto-optic materials. In the domain of electro-optic modulation, TFLN enables significant improvements in efficiency and bandwidth through innovative electrode and waveguide designs. These engineered electrode structures can enhance the overlap between optical and radio-frequency fields while maintaining impedance matching and minimizing microwave loss.

The performance of on-chip photonic devices is strongly linked to fabrication quality. Systematic optimization of fabrication processes has enabled dramatic reductions in scattering loss, leading to ultra-low propagation losses and high-quality-factor resonators. This work represents a significant step toward fully integrated photonic systems, where isolation, modulation, and filtering functionalities coexist on a single chip, enhancing system stability and scalability.

Completion Date

2026

Semester

Summer

Committee Chair

Fathpour Sasan

Degree

Doctor of Philosophy (Ph.D.)

College

College of Optics and Photonics

Department

Optics and Photonics PhD

Document Type

Dissertation

Language

English

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