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Proceedings Paper

Far-field pattern and mode structure of photonic-crystal-based planar distributed-feedback laser structures
Author(s): Andreas Klaedtke; Stefan Scholz; Ortwin G. Hess
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Paper Abstract

Using full three-dimensional finite-difference time-domain (FDTD) simulations of Maxwells' equations we investigate the mode and photonic band structure and far-field pattern of distributed feedback resonators used in organic lasers. The distributed feedback structure under investigation consists of a two layered system. The first layer is a thick substrate that has a one or two dimensionally corrugated (nano-patterned) surface structure. The active material is a thin layer on top of the corrugated structure. The whole structure is assumed being surrounded by vacuum. Our FDTD calculations are carried out by applying mixed uniaxial perfectly matched layers (UPML) and periodic boundary conditions. This new technique allows us to investigate both guided and leaking modes of dielectric periodic systems. The far-field is obtained by a near-field to far-field transformation. The mode pattern is calculated by spatially resolved discrete temporal Fourier transformation of a particular frequency of interest. A similar computation reveals the frequencies that form the photonic band structure. Our computations show the characteristics of the DFB resonator and explain central aspects of the lasing process in these devices, such as the position and width of the band gap. These results are in good qualitative and quantitative agreement with experimental results.

Paper Details

Date Published: 9 July 2001
PDF: 7 pages
Proc. SPIE 4283, Physics and Simulation of Optoelectronic Devices IX, (9 July 2001); doi: 10.1117/12.432596
Show Author Affiliations
Andreas Klaedtke, DLR (Germany)
Stefan Scholz, DLR (Germany)
Ortwin G. Hess, DLR (Finland)

Published in SPIE Proceedings Vol. 4283:
Physics and Simulation of Optoelectronic Devices IX
Yasuhiko Arakawa; Peter Blood; Marek Osinski, Editor(s)

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