Effective dielectric constant of two-dimensional photonic crystals in optical bands
2006 (English)In: Solid State Communications, ISSN 0038-1098, E-ISSN 1879-2766, Vol. 138, no 4, 205-210 p.Article in journal (Refereed) Published
By using the Fourier expansion method, we have developed an approach to calculate the effective dielectric index of a two-dimensional photonic crystal. The approach is very general: it can take into account various Bravais lattice structure as well as arbitrary spatial variation of the dielectric index. It has been found that near a nondegenerate frequency w(n)(Gamma) at Gamma point, the transverse magnetic (TM) mode is ordinary, as it is independent of the propagation direction, whereas in general the transverse electric (TE) mode depends on the propagation direction, it is extraordinary. Therefore, a two-dimensional photonic crystal can always be described by an effective dielectric index for TM mode near the nondegenerate frequency w(n)(Gamma). However, the TE mode is much more complicated unless the lattice structure is highly symmetric. Moreover, a two-dimensional square photonic crystal has been identified as an effective birefringent crystal having two negative refractive indexes from the perspective of Snell's law.
Place, publisher, year, edition, pages
2006. Vol. 138, no 4, 205-210 p.
photonic crystals, electromagnetic theory, refraction
IdentifiersURN: urn:nbn:se:kth:diva-15663DOI: 10.1016/j.ssc.2006.02.019ISI: 000237436400009ScopusID: 2-s2.0-33645973544OAI: oai:DiVA.org:kth-15663DiVA: diva2:333705
QC 201005252010-08-052010-08-05Bibliographically approved