Regensburg 2000 – scientific programme

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HL: Halbleiterphysik

HL 12: Poster I: Quanten Hall Effekt (1-9), II-VI Halbleiter (10-17), Epitaxie (18-23), Quantenpunkte und -dr
ähte (24-50), Photonik (51-59), Metall-Isolator Übergang (60-64), Si/Ge (65-67), Elektronentheorie (68-69), Amorphe Halbleiter, Ionen-Implantation

HL 12.57: Poster

Monday, March 27, 2000, 14:00–19:00, A

Strong dispersion phenomena in artificial opal structures — •Dimitry N. Chigrin, Sergei G. Romanov, Torsten Maka, and Clivia M. Sotomayor Torres — Inst. of Materials Science and Dept. of Electrical Engineering, BUGH Wuppertal

The dispersion properties of three-dimensional photonic crystals are studied. Besides the possible existence of full photonic bandgaps and related phenomena, photonic crystals display strong anisotropy and wavelength dependence of their dispersion properties. We have studied dispersion properties of artificial opal structures. Here we present a model of superprism phenomena applied to a fcc lattice of spherical balls. Superprism phenomena include a number of ultrarefractive phenomena owing to the drastic modification of group velocity inside a photonic crystal. The extraordinary large beam bending and steering, beam focusing and collimating and beam branching can be displayed by artificial opal structures. We will discuss the underlying physics of these phenomena and some promising applications for optoelectronics devices. In particular we will show to what degree superprism effects can be expected in one-dimensional photonic crystals. The theoretical analysis of dispersion properties of photonic crystals has been performed based on dispersion diagrams study. The Pendry transfer matrix method has been adopted for 3D dispersion diagrams calculations. Experimental verification of some phenomena is in progress.