ELFT HÍRADÓ

[kadargy <kadargy AT mfa.kfki.hu>]

MFA Szeminárium (holnapután)

Prof. Kazuaki SAKODA
(Nat. Inst. Materials Science, Tsukuba):

Selection rules for Light Scattering by Localized
Eigenmodes of the Menger Sponge Fractal

2005. június  29.-én, szerdán
délelőtt 11:00 órakor az MTA Műszaki
Fizikai és Anyagtudományi Kutatóintézet
Tanácstermében, KFKI 26. épület I. emelet

Abstract
An effort to lokalize electromagnetic (EM) waves in a three-dimensional 
fractal was reported recently. It was claimed that a quality (Q) factor 
as large as 610 was observed by an experimental study of microwave 
transmission and reflection for the Menger sponge fractal made of an 
epoxy resin with dielectric constant of 2.8. However, there was an 
ambiguity in the interpretation of the experimental data and the Q 
factor of 610 was an apparent overestimation. However, as I will show in 
this presentation, localized EM modes with the Q factor of several 
hundreds can certainly be realized in the Menger sponge when the 
dielectric constant is increased to 8.8 (mixture of epoxy resin and 
metal oxides). I will show this by the numerical simulation of dipole 
radiation based on the FDTD (finite difference time domain) method. The 
eigenfrequencies, Q factors and field distributions of the localized 
modes will be presented. In addition, the selection rules for the 90 
degree light scattering due to the symmetry of the eigenmodes will be 
derived and compared with the calculated spectra.

Minden érdeklődőt szívesen várunk

Kádár György (MFA)
kadargy AT sunserv.kfki.hu