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Faraday rotation in two-dimensional magneto-optic photonic crystal
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Information Technology, IMIT.
2005 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 253, no 1-3, 145-150 p.Article in journal (Refereed) Published
Abstract [en]

We study the enhancement of Faraday rotation in a two-dimensional square-lattice magneto-optic photonic crystal at optical wavelengths. We show that on incidence of a TM plane wave onto the magneto-optic photonic crystal, high TM-TE mode conversion takes place in the transmission bands of TM and TE fields. The photonic crystal structure increases the average wave path length, which in turn leads to a growth in the polarization rotation. We also show that associated with this phenomenon is a widening of the photonic crystal transmission band.

Place, publisher, year, edition, pages
2005. Vol. 253, no 1-3, 145-150 p.
Keyword [en]
Faraday rotation, Photonic band gap, Photonic crystals
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6467DOI: 10.1016/j.optcom.2005.04.064ISI: 000231519600018Scopus ID: 2-s2.0-23844478894OAI: oai:DiVA.org:kth-6467DiVA: diva2:11188
Note
QC 20100914. Uppdaterad från Submitted till Published (20100914)Available from: 2004-11-12 Created: 2004-11-12 Last updated: 2010-09-14Bibliographically approved
In thesis
1. On ferromagnetic thin films and two-dimensional magneto-optic photonic crystals
Open this publication in new window or tab >>On ferromagnetic thin films and two-dimensional magneto-optic photonic crystals
2004 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis presents results in two different neighboring areas of research: the magnetic properties of thin ferrite films and the application of the films in two-dimensional photonic crystals.

In the first part, we investigate the accuracy of the customary method for determining the magnetic anisotropy constants of ferrite films by ferromagnetic resonance (FMR) experiment. We have improved the method and introduced an experimental procedure to obtain the anisotropy constants with higher precision. The magnetic anisotropy fields are obtained by using FMR on a (111)-oriented yttrium iron garnet (YIG) film made by pulsed laser deposition. Moreover, we found experimentally that the shapes of FMR spectra of laser deposited epitaxial YIG films strongly depend on the orientation of the magnetic bias field with respect to the crystalline axes of the film. Inhomogeneities of the constants of anisotropy throughout the film could be responsible for the complexity of the FMR spectra. We find the special directions of the applied magnetic field in which the contribution of the magnetocrystalline anisotropy has the smallest effect on the ferromagnetic resonance and therefore on the elements of the permeability tensor.

In the second part, we study the electromagnetic wave propagation in two-dimensional (2D) dielectric and magneto-optic photonic crystals (PCs). We have proposed a 2D PC which is composed of magneto-optic material for the purpose of the enhancement of Faraday rotation in high transmission. It is assumed that the 2D PC contains a bismuth iron garnet (BIG) film either as the PC background medium or as a defect, embedded in the 2D PC. We have examined theoretically and computationally the increase in the Faraday rotation as well as the transmission of a plane-polarized plane wave incident onto these structures in the optical wavelength regime. Several important phenomena, with potential applications, are observed.

Place, publisher, year, edition, pages
Kista: Mikroelektronik och informationsteknik, 2004
Series
TRITA-MVT, ISSN 0348-4467 ; 2004:6
Keyword
Physics, photonic crystals, physics, Fysik
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-42 (URN)
Public defence
2004-11-12, C1, Electrum, Kista, 13:00
Opponent
Supervisors
Available from: 2004-11-12 Created: 2004-11-12 Last updated: 2016-11-24

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