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Computation of optical properties of Si‐based photonic crystals with varying pore diameters
Author(s) -
Hillebrand R.,
Jamois C.,
Schilling J.,
Wehrspohn R. B.,
Hergert W.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301864
Subject(s) - photonic crystal , materials science , wafer , dielectric , cladding (metalworking) , slab , photonics , optics , optoelectronics , composite material , physics , geophysics
Two‐dimensional Si‐based photonic crystals of triangular lattice type are routinely fabricated by electrochemical pore etching of prestructured Si‐wafers. The radius of the pores can be modulated during the growth process. Based on Maxwell's equations, we theoretically study the optical properties (band structures, electromagnetic fields) of such photonic crystals by applying models with modulated pore diameters. The models are systematically varied with respect to the pore diameters and the pore profiles in the growth direction. Thus, the dielectric contrast between the central narrow core and the outer wide cladding parts can be controlled in analogy to slab structures. We identify conditions for the confinement of the electromagnetic fields inside the core region. The confinement is quantified by correlating the fields with the pore geometry. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)