Effect of Fe3O4 nanoparticles on the optical transmission properties of 3D magnetic photonic crystals
2010 (English)In: Physics ReviewArticle in journal (Other academic) Submitted
Magnetic and optical properties of three-dimensional magnetic photonic crystals (MPCs), consisting of silica spheres in the size range 190-680nm embedded with 8, 9 and 13 nm Fe3O4 nanoparticles, have been investigated. All the PC-films, with and without embedded magnetic nanoparticles, show five band gaps at well defined wavelengths in their optical transmission spectrum. The band gaps are found to be a linear function of the constituent sphere size in the MPC films. From the slope of this function, the deduced refractive index for the constituents in the films is found to increase with the concentration of the embedded magnetite nanoparticles. The observed shifts in the photonic band gaps PBGs in the films is qualitatively explained in terms of the variations of refractive index and the contrast index difference arising from the concentration of the embedded nanoparticles. We also find that the angular dependence of PBG positions for MPCs at small incidence angles is strongly dependent on the p- and s- polarization states of the incident light. The polarization sensitivity of PBGs to the Fe3O4 concentration is also discussed.
Place, publisher, year, edition, pages
Atom and Molecular Physics and Optics Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-31403OAI: oai:DiVA.org:kth-31403DiVA: diva2:403587
QS 201203152011-03-142011-03-142012-03-15Bibliographically approved