We analyze different methods for controlling positions of guided modes of planar photonic-crystal waveguides. Methods based both on rearrangements of holes in the photonic-crystal lattice and on changes of hole sizes are presented. The ability to tune frequencies of guided modes within a frequency bandgap is necessary to achieve efficient guiding of light within a waveguide, as well as to match frequencies of eigenmodes of different photonic-crystal-based devices for the purpose of good coupling between them. We observe and explain the appearance of acceptor-type modes in donor-type waveguides.
© 2001 Optical Society of America
(000.4430) General : Numerical approximation and analysis
(230.3990) Optical devices : Micro-optical devices
(230.7390) Optical devices : Waveguides, planar
(250.0250) Optoelectronics : Optoelectronics
(250.5300) Optoelectronics : Photonic integrated circuits
Marko Lončar, Jelena Vučković, and Axel Scherer, "Methods for controlling positions of guided modes of photonic-crystal waveguides," J. Opt. Soc. Am. B 18, 1362-1368 (2001)