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Pulsed Laser Deposited TiO2Films: Tailoring optical properties
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.
2008 (English)In: Thin Solid Films, ISSN 0040-6090, E-ISSN 1879-2731, Vol. 516, no 23, 8697-8701 p.Article in journal (Refereed) Published
Abstract [en]

TiO2 amorphous films have been pulsed laser deposited onto glass substrates. Film characterization by X-ray diffraction, atomic force microscopy and transmission spectroscopy was performed with the aim of extracting the information on the film crystalline structure, surface roughness and optical properties. Three methods for improving film optical performance have been employed, namely deposition at elevated temperatures, post-annealing in thermodynamically equilibrium conditions and rapid thermal annealing (RTA). The best characteristics were achieved in the case of the film subjected to RTA at 500 °C: refractive index n = 2.53, absorption coefficient α = 404 cm- 1 at λ = 550 nm and rms surface roughness as low as 0.6 nm. The results obtained were found to be one of the best published so far.

Place, publisher, year, edition, pages
2008. Vol. 516, no 23, 8697-8701 p.
Keyword [en]
Absorption coefficient, Anatase, Pulsed laser deposition, Rapid thermal annealing, Refractive index, Rutile, Surface roughness
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-11137DOI: 10.1016/j.tsf.2008.05.010ISI: 000260579800081Scopus ID: 2-s2.0-50849144335OAI: oai:DiVA.org:kth-11137DiVA: diva2:236323
Note
QC 20100928Available from: 2009-09-22 Created: 2009-09-22 Last updated: 2010-09-28Bibliographically 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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