Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 53: Photonik in komplexen Strukturen
Q 53.4: Vortrag
Freitag, 28. März 2003, 14:45–15:00, F142
Angle- and spectrally-resolved Bragg scattering on two-dimensional silicon-based photonic crystals — •Wolfpeter Koch2, Georg von Freymann1, Martin Wegener1,2, Marcus Diem3, Antonio Garcia-Martin3, Surresh Pereira3, Kurt Busch3, Jörg Schilling4, Ralf B. Wehrspohn4, and Ulrich Gösele4 — 1Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe — 2Institut für Angewandte Physik, Universität Karlsruhe (TH), 76128 Karlsruhe — 3Institut für Theorie der Kondensierten Materie, Universität Karlsruhe (TH), 76128 Karlsruhe — 4Max-Planck-Institut für Mikrostrukturphysik, 06120 Halle
We show that the envelope of the diffraction efficiency of a two-dimensional silicon photonic crystal can exhibit spectral regions of very small diffraction efficiency (< 10−4), while in other regions, the diffraction efficiency is near unity. In the experiment, light from a halogen lamp is coupled into a balanced Michelson interferometer. At the end mirrors, one of which is replaced by the photonic crystal, the light is focused to a spot diameter of about 100 µm, which illuminates the entire height of the sample. The spectrum is obtained from the Fourier transform of the interferogram. The experimental results on hexagonal, silicon-based photonic crystals agree qualitatively with corresponding numerical calculations. Furthermore, we point out the crucial influence of the surface termination for reflection experiments and speculate about possible applications of such additional spectral filters in Raman and photoluminescence spectroscopy.