First Advisor

Rolf Könenkamp

Term of Graduation

Fall 2021

Date of Publication

1-18-2022

Document Type

Thesis

Degree Name

Master of Science (M.S.) in Physics

Department

Physics

Language

English

Subjects

Zinc oxide thin films, Thin films -- Optical properties, Lasers, Silica, Nanostructured materials

DOI

10.15760/etd.7765

Physical Description

1 online resource (viii, 46 pages)

Abstract

In this thesis, we explore the preparation of random lasers (RLs) using solution-deposited, randomly packed nano-particle films of zinc oxide (ZnO) impregnated with silicon dioxide (SiO2) nanospheres. RLs have their scatterers randomly oriented, while their lasing comes from light propagating along closed paths through the scattering environment. It is shown here that random lasing is readily observed in films made of submicron sized ZnO particles. Adding transparent SiO2 nanospheres to the films, we show there is an effective improvement of the lasing that is observable in all of the samples spectra. Specifically, we found that the lasing thresholds were lowered, the linewidths decreased, and the lasing output increased as compared to our pure ZnO films. In the best films the spheres occupied a volume of approximately 53%. We also analyzed films with fluorescent pink poly Latex spheres (Latex spheres) in the ZnO. These films did not produce random lasing, however, likely due to damage occurring in these polymeric spheres under optical pumping.

Rights

© 2021 Benito Reynaldo Resendiz

In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).

Persistent Identifier

https://archives.pdx.edu/ds/psu/37077

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