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Fitting transmission and Faraday rotation spectra of Bi3Fe5O12/Sm3Ga5O12 (m) magneto-optical photonic crystals
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.
2009 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 106, no 4, 043901- p.Article in journal (Refereed) Published
Abstract [en]

A consistent microscopic approach is developed to simulate the transmittance and Faraday rotation in all-garnet heteroepitaxial magneto-optical photonic crystals (MOPCs). To compare the experimental and simulation results, [Bi3Fe5O12/Sm3Ga5O12](m) (BIG/SGG) MOPC designed to operate at a telecommunication wavelength lambda(res)=980 nm was chosen. It was composed of [BIG/SGG](5) and [SGG/BIG](5) distributed Bragg reflectors with a microcavity layer of BIG in between. The dispersion relations of the diagonal and off-diagonal elements of the permittivity tensor (epsilon) over cap for BIG in the electric dipole approximation were obtained from the simulation of the transmittance and Faraday rotation for a reference single layer BIG film. Revealed dispersion relations were then combined with the 4 x 4 matrix formalism for magnetic superlattices to compute transmission and Faraday rotation spectra of the MOPC. The results of numerical simulations were found to be in good agreement with the experimental ones.

Place, publisher, year, edition, pages
2009. Vol. 106, no 4, 043901- p.
Keyword [en]
magnetophotonic crystals, superlattices, garnet, lasers
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-18782DOI: 10.1063/1.3195067ISI: 000270083800059Scopus ID: 2-s2.0-69749102229OAI: oai:DiVA.org:kth-18782DiVA: diva2:336829
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically 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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