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Title: Optical and mechanical effects of elastomeric distributed Bragg reflectors
Author: Kamita, Gen
ISNI:       0000 0004 5364 5435
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 2014
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The stop-band tuning of elastomeric distributed Bragg reflectors (DBRs) by deformation, and the underlying mechanical phenomena were studied. The main findings can be summarized as the follows. 1. Repeatable full-colour tuning of the DBR is possible by inflating the DBR into an axisymmetric balloon. 2. The heterogeneous distribution of strain originating from the inflated shape has an impact on the optical and mechanical response of the DBR. 3. Thin elastomer films are under strong influence of surface tension which influences their stress and strain during the fabrication process. The thesis will be organized as follows. After an introduction to the thesis in Chapter 1, Chapter 2 will discuss the theoretical background. The materials and methods used in the experiments will be covered in Chapters 3. The optics and the mechanics of elastomeric DBRs will be discussed in Chapter 4 and 5. Throughout these chapters, the elastomeric DBRs were studied in axisymmetrically inflated states. The inhomogeneous strain distribution arising from the geometry of the inflated state and the mechanical property of the material, gave rise to a novel colour mixing effect. Chapter 6 discusses the strain induced by the fabrication method of the elastomeric DBR. Soft materials are highly susceptible to buckling and related instabilities; therefore studying the stress and strain in a systematic fashion would open the door for improving the quality, scalability and reproducibility of the fabrication of elastomeric DBRs and related optical devices.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral