Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 53: Photonik in komplexen Strukturen
Q 53.7: Vortrag
Freitag, 28. März 2003, 15:30–15:45, F142
Distributed feedback lasing in a planar metallic photonic crystal — •J. Crewett1, J. Stehr1, F. Schindler1, T. A. Klar1, U. Lemmer2, J. Feldmann1, A. Holleitner3, U. Scherf4, K. Forberich5, A. Gombert5, and V. Wittwer5 — 1Lehrstuhl für Photonik und Optoelektronik, Ludwig-Maximilians-Univ. München — 2Lichttechnisches Institut, Univ. Karlsruhe — 3Lehrstuhl für experimentelle Halbleiterphysik, LMU München — 4Lehrstuhl für Polymerchemie, Univ. Wuppertal — 5Fraunhofer Institut für Solare Energiesysteme ISE, Freiburg
An optically amplifying organic semiconductor is used as the active medium in a novel photonic crystal laser structure incorporating a two-dimensional array of gold nanoparticles written by electron beam lithography. Size and shape of the gold particles are found to have little influence on the characteristics of such a laser, indicating that particle plasmon effects in these structures are less pronounced than photonic bandstructure effects.
The resulting laser emission spectra show two separate linearly polarized modes in the x- and y-direction, respectively. These modes can be spectrally shifted relative to each other by a tunable mismatch between the x- and y- lattice constants of the grating. It has already been shown earlier that coupling of individual 1D modes in a DFB laser leads to an unpolarized 2D laser mode with a lower threshold and higher efficiency. A comparison of this metal nanoparticle DFB laser with a holographically prepared DFB laser structure is used to investigate the conditions for 2D coupling in square DFB gratings.