Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: Poster III

HL 36.21: Poster

Mittwoch, 27. Februar 2008, 16:30–19:00, Poster D

Refined transmission measurement setup for 2D-terahertz photonic crystals — •Thomas Kissinger and Andrei Pimenov — Physikalisches Institut, Universität Würzburg, Germany

We examine transmission spectra of 2D-photonic crystals in the terahertz frequency region quantitatively. We show that the reasons for deviations between calculated (employing FDTD-simulations) and experimental spectra are often not due to sample manufacturing, but due to the optical measuring setup. Issues like high diffraction of terahertz waves, spatial frequency (k-vector) selection of output radiation, deviations from incoming plane-wave illumination and finite size effects of the sample or simulation cell are all important to understand the transmittance of such highly anisotropic objects like photonic crystals. We compare and optimize different experimental and simulation setups in order to obtain stable and mutually consistent results, while keeping the optical system and the models used as simple and straightforward as possible.