Design and synthesis of advanced broadband optical coatings

Bilus Abaffy, N 2010, Design and synthesis of advanced broadband optical coatings, Doctor of Philosophy (PhD), Applied Science, RMIT University.

Document type: Thesis
Collection: Theses

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Title Design and synthesis of advanced broadband optical coatings
Author(s) Bilus Abaffy, N
Year 2010
Abstract Optical coatings have applications across a wide variety of industries with antireflective coatings accounting for a major proportion of production. Some of the most dynamic research into optical thin films is currently being conducted in the field of optoelectronics. New screen display technologies, smarter windows and more efficient photovoltaic devices are being produced as a result. With the relentless evolution of devices and technologies, more advanced optical coatings capable of meeting the specifications are required. Synthesis of advanced broadband optical coating designs is a major challenge in the field. Using the unique functionality of the Filtered Cathodic Vacuum Arc (FCVA) to control the deposition energy and hence the growth morphology of sub-10nm Al thin films, an antireflective optical coating based on an Al2O3/Al/Al2O3 trilayer design was synthesised on Si. A study of aluminium sub-oxide thin films deposited using FCVA was carried out in order to relate their optical properties with their composition. The results were then used to develop a method for depositing ceramic metallic (cermet) gradient index coatings with desirable optical properties. Atomic Layer Deposition (ALD) was used to produce a series of AlxTi1-xOy dielectric composite thin films and the microstructure and optical properties were characterised in detail. The optical properties were found to be an amalgamation of the spectral characteristics of the constituent materials. It was found that the chemical composition of a gradient coating can be effectively controlled through the use of different composite cycle ratios using ALD. In this way a precise method for the deposition of gradient index coatings composed of AlxTi1-xOy with tailored optical properties has been attained. This particular ALD method shows promise for the production of complex gradient index filter designs.
Degree Doctor of Philosophy (PhD)
Institution RMIT University
School, Department or Centre Applied Science
Keyword(s) optical coating
optical thin film
gradient index
optical cermet
dielectric composite
rugate synthesis
aluminium sub-oxide
aluminium titanium oxide
tailored optical materials
optical properties
deposition method comparison
filtered cathodic vacuum arc
atomic layer deposition
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Created: Fri, 22 Nov 2013, 13:15:30 EST by Denise Paciocco
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