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Enhanced photoluminescence in [Er2O3/TiO2]m 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.ORCID iD: 0000-0001-8774-9302
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. 105, no 11, 113122- p.Article in journal (Refereed) Published
Abstract [en]

We survey optical properties of [Er2O3/TiO 2]6/Er2O32/[TiO 2/Er2O3]6 photonic crystals (PCs) pulsed laser deposited on to the glass substrates. The dispersion relations of refractive indexes and extinction coefficients of the constituent materials were obtained from the comparison of experimental and simulated transmission spectra of single layer Er2O3 and TiO2 reference films. Based on these data several PCs have been designed and grown to match stop band and cavity mode resonance at wavelengths close to the 523 nm Er 3+-ion Fraunhofer 4S3/2 absorption line. Precise control of chemical composition and uniform multilayer thickness enable achievement of superior optical performance of sintered PCs. Obtained dispersion relations were combined with the 2×2 transfer matrix formalism to compute PC transmittance that appeared to be in a good agreement with the experimental spectra. Pumping PCs with 514 nm light source we observed a strong photoluminescence (PL) at 1535 nm. In PC specially designed for the resonance wavelength λres =514 nm, C-band PL intensity experiences fivefold enhancement compared to a single layer Er2 O3 film of equivalent thickness.

Place, publisher, year, edition, pages
2009. Vol. 105, no 11, 113122- p.
Keyword [en]
Absorption lines, At-wavelength, Cavity mode, Chemical compositions, Constituent materials, Dispersion relations, Equivalent thickness, Experimental spectra, Extinction coefficients, Fraunhofer, Glass substrates, Optical performance, PL intensity, Precise control, Pulsed laser, Reference films, Resonance wavelengths, Simulated transmission spectra, Single layer, Stop-bands, TiO, Transfer matrixes
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-11132DOI: 10.1063/1.3143082ISI: 000267053200022Scopus ID: 2-s2.0-67649544889OAI: oai:DiVA.org:kth-11132DiVA: diva2:236284
Note
QC 20101008Available from: 2009-09-22 Created: 2009-09-22 Last updated: 2017-12-13Bibliographically 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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Khartsev, Sergey

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