Optical Science and Engineering ETDs

Publication Date

Fall 12-15-2024

Abstract

This thesis explores the light propagation characteristics in Y-junction couplers based on the Helmholtz reciprocity principle. The Helmholtz reciprocity principle is a crucial concept in optical system design, and it has primarily been understood based on input-output symmetry. However, this study emphasizes reciprocity needs to consider the entire system, beyond the traditional input-output symmetry reciprocity interpretation. For this study, we specifically examined the direction-dependent asymmetrical outputs, in the Whistle-geometry Ring Laser (WRL) structure. And the WRL results cannot be fully explained by simple input-output symmetry for reciprocity. The Y-junction coupler in the WRL structure makes different output characteristics based on direction, highlighting the reciprocity requires a more comprehensive understanding of the entire system and it does not require symmetrical output intensity regardless of light propagation direction.

Degree Name

Optical Science and Engineering

Level of Degree

Masters

Department Name

Optical Science and Engineering

First Committee Member (Chair)

Dr. Marek Osinski

Second Committee Member

Dr. Payman Zarkesh-ha

Third Committee Member

Dr. Ganesh Balakrishnan

Document Type

Thesis

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