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Tailoring optical properties of pulsed laser deposited TiO2 films
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
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2008 (English)In: PROCEEDINGS OF THE 17TH INTERNATIONAL VACUUM CONGRESS/13TH INTERNATIONAL CONFERENCE ON SURFACE SCIENCE/INTERNATIONAL CONFERENCE ON NANOSCIENCE AND TECHNOLOGY / [ed] Johansson LSO; Andersen JN; Gothelid M; Helmersson U; Montelius L; Rubel M; Setina J; Wernersson LE, BRISTOL, ENGLAND: IOP PUBLISHING LTD , 2008, no 100, 082035- p.Conference paper, Published paper (Refereed)
Abstract [en]

The paper is dedicated to the investigation into optical properties of TiO2 thin films pulsed laser deposited at the temperature as low as 150 degrees C and subjected to the following heat treatment. Properties of obtained nanocrystalline films were compared to polycrystalline TiO2 films grown at elevated temperatures. The highest transmission and the best morphology in polycrystalline films have been obtained at the growth temperature of 300 degrees C. The two methods of post-annealing of amorphous films were employed: annealing at thermodynamically equilibrium conditions and rapid thermal annealing (RTA). RTA at 500 degrees C enables achievement of the best optical performance: smooth surface and high films transparency.

Place, publisher, year, edition, pages
BRISTOL, ENGLAND: IOP PUBLISHING LTD , 2008. no 100, 082035- p.
Series
Journal of Physics Conference Series, ISSN 1742-6588 ; 100
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-11133DOI: 10.1088/1742-6596/100/8/082035ISI: 000275655200313OAI: oai:DiVA.org:kth-11133DiVA: diva2:236288
Conference
17th International Vacuum Congress/13th International Conference on Surface Science/Internatinal Conference on Nanoscience and Technology
Note

QC 20101008

Available from: 2009-09-22 Created: 2009-09-22 Last updated: 2016-12-19Bibliographically approved
In thesis
1. Complex Oxide Photonic Crystals
Open this publication in new window or tab >>Complex Oxide Photonic Crystals
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Microphotonics has been offering a body of ideas to prospective applicationsin optics. Among those, the concept of photonic integrated circuits (PIC’s) has recently spurred a substantial excitement into the scientific community. Relisation of the PIC’s becomes feasible as the size shrinkage of the optical elements is accomplished. The elements based on photonic crystals (PCs) represent promising candidacy for manufacture of PIC’s. This thesis is devoted to tailoring of optical properties and advanced modelling of two types of photonic crystals: (Bi3Fe5O12/Sm3Ga5O12)m and (TiO2/Er2O3)m potentially applicable in the role optical isolators and optical amplifiers, respectively. Deposition conditions of titanium dioxide were first investigated to maximise refractive index and minimise absorption as well as surface roughness of titania films. It was done employing three routines: deposition at elevated substrate temperatures, regular annealing in thermodynamically equilibrium conditions and rapid thermal annealing (RTA). RTA at 500 oC was shown to provide the best optical performance giving a refractive index of 2.53, an absorption coefficient of 404 cm−1 and a root-mean-square surface roughness of 0.6 nm. Advanced modelling of transmittance and Faraday rotation for the PCs (Bi3Fe5O12/Sm3Ga5O12)5 and (TiO2/Er2O3)6 was done using the 4 × 4 matrix formalism of Višňovský. The simulations for the constituent materials in the forms of single films were performed using the Swanepoel and Višňovský formulae. This enabled generation of the dispersion relations for diagonal and off-diagonal elements of the permittivity tensors relating to the materials. These dispersion relations were utilised to produce dispersion relations for complex refractive indices of the materials. Integration of the complex refractive indices into the 4 × 4 matrix formalism allowed computation of transmittance and Faraday rotation of the PCs. The simulation results were found to be in a good agreement with the experimental ones proving such a simulation approach is an excellent means of engineering PCs.

Place, publisher, year, edition, pages
Stockholm: Kista Snabbtryck AB, 2009. x, 52 p.
Series
Trita-ICT/MAP AVH, ISSN 1653-7610 ; 2009:6
Keyword
Photonic crystals, magneto-optical effects, refractive index, iron garnet
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-11068 (URN)978-91-7415-382-8 (ISBN)
Presentation
2009-09-21, FMI conference room, 3rd floor, Isafjordsgatan 22, Kista, 10:15 (English)
Opponent
Supervisors
Available from: 2009-09-22 Created: 2009-09-15 Last updated: 2010-10-08Bibliographically approved

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