Page 205 - Book Hosokawa Nanoparticle Technology Handbook

4.2 NANOPARTICLES ARRANGED STRUCTURES FUNDAMENTALS

Figure 4.2.2
A stage 4 Menger sponge formed by stereolithography. The cube edge size is 81 mm. Four different size square holes with
27, 9, 3, 1 mm in edge size are opened against each face.

Figure 4.2.3
Transmission and reflection spectra of electromagnetic
waves against a stage 4 Menger sponge structure. The
second order localization peak appears at 13.5 GHz. Figure 4.2.4
Another deep transmission attenuation at around 6 GHz Electric field mapping image at the inner and outer space
corresponds to the cutoff frequency by a horn antenna. of a stage 4 Menger sponge on the mid-plane.

transmission and reflection spectra indicates that the peak frequency. The estimated confinement time from
scattered intensity of a localized mode increases than this value was about 2 ns. The Q value and the con-
that of delocalized mode. finement time are very low at present. The survey of
The quality factor Q was about 180, which was cal- low loss ceramics and design of effective fractal struc-
culated from the half width of the scattered peak and ture to reduce scattering are investigated.

181