Yasushi SAKURADA, Jun UOZUMI and Toshimitsu ASAKURA

Research Institute for Electronic Science, Hokkaido University, Sapporo, Hokkaido 060, Japan

(Accepted July 22, 1994)

Experimental study is performed of optical diffractions by two-dimensional, self-similar mass and surface fractal apertures as well as mass fractal apertures bounded by surface fractals. Self-similar intensity distributions are observed in the Fraunhofer diffraction fields from surface and mass fractal apertures. Power law decays in average intensities of the diffraction patterns are also investigated for the mass, surface and combined fractal apertures in connection with the fractal dimensions of the objects.

Key words : mass fractal, surface fractal, combined fractal, self-similarity, power law, fractal dimension