Regensburg 2004 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 20: Photonische Kristalle IV

HL 20.2: Vortrag

Dienstag, 9. März 2004, 15:30–15:45, H17

EFFECTS OF DISORDER IN MICROWAVE REALIZATIONS OF 1D PHOTONIC CRYSTALS: — •G.A. Luna-Acosta^1,2, H. Schanze¹, U. Kuhl¹ und H.-J. Stöckmann¹ — ¹Fachbereich Physik der Philipps Universität Marburg, Renthof 5, D-35032 — ²Instituto de Fisica, BUAP, Puebla, Mexico.

We experimentally investigate the effects of structural and impurity disorder in 1D photonic lattices and superlattices of finite length. These lattices are realized in the microwave regime by an array of teflon pieces of length d_T alternating periodically with air spacings of length d_A in a single-mode microwave guide experiment. Structural ( positional) disorder is achieved by an uncorrelated random variation ξ of the air spacings and/or the teflon inserts. Impurity disorder is realized by placing a few teflon pieces of length d_imp within the air spacing of the ideal crystal. The manifestation in the transmission measurements of weak, intermediate, and strong disorder of both types of disorder is analyzed and compared with simple transfer matrix calculations. We also discuss our results in connection with theories of correlated and uncorrelated random disorder in 1D potentials.