2026-09-21T13:53:03Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/121355 2023-12-13 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Choquette, Kent D Choquette, Kent D Lee, Minjoo L Goddard, Lynford L Dragic, Peter D 2023-08 application/pdf en text Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01 The student, William North, accepted the attached license on 2023-07-11 at 15:40. The student, William North, submitted this Dissertation for approval on 2023-07-11 at 16:23. This Dissertation was approved for publication on 2023-07-12 at 16:32. DSpace SAF Submission Ingestion Package generated from Vireo submission #19632 on 2023-12-04 at 17:18:30 North, William Keith 2023-07-12 Optical Coupling Phased Arrays Semiconductor Laser Arrays Vertical Cavity Surface Emitting Lasers Semiconductor lasers are an essential technology that finds widespread use in numerous applications. The performance of these lasers depends on their modal characteristics, which, in turn, are determined by the laser cavity's design. As a result, the laser cavity plays a critical role in tailoring the device to a specific application. This work explores modifications to the cavity through dual-element coupled vertical cavity surface emitting laser (VCSEL) arrays, photonic crystal surface emitting lasers (PCSEL), and topological cavity surface emitting lasers (TCSEL), all of which use photonic crystals. Our analysis of the VCSEL array reveals that the device operates in three distinct regimes: a single independent local mode, a region of two modes that are primarily localized into a specific cavity, and a region of two supermodes whose fields extend across both elements. When we focus our analysis on the coherently-coupled region, we identify two supermodes that create a photon-photon resonance, which enhances the digital modulation in these devices. We also investigate PCSELs and TCSELs for use in high-brightness applications, where a buried dielectric photonic crystal is used to create a photonic bandgap which is scalable while maintaining a single mode. We discuss the requirements for device fabrication, define mask layouts, and optimize design parameters. Overall, this work presents a comprehensive analysis of various modifications to a semiconductor laser diode cavity and highlights their potential for emerging applications. Text eng https://hdl.handle.net/2142/121355 Copyright 2023 William North Semiconductor laser diode mode properties arising from engineered photonic crystals Ph.D. Dissertation Electrical & Computer Engr University of Illinois at Urbana-Champaign Electrical & Computer Eng