Advanced impedance matching in photonic crystal waveguides

被引：0
作者：
Abbas Mohtashami
Javad Zarbakhsh
Kurt Hingerl
机构：
[1] Universität Linz,Christian Doppler Labor für Oberflächenoptische Methoden, Institut für Halbleiter und Festkörperphysik
[2] Malek Ashtar University of Technology,Optics and Laser Engineering Group, Faculty of Applied Sciences
[3] KAI - Kompetenzzentrum Automobil- und Industrieelektronik GmbH,undefined
来源：
Optical and Quantum Electronics | 2007年 / 39卷
关键词：
Impedance matching; Photonic crystal waveguides; Group velocity; Local density of states; Design flexibility; Local dispersion; Mode coupling; Group velocity mismatch;
D O I：
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中图分类号：
学科分类号：
摘要：
We demonstrate that the dispersion of guided propagating modes in certain Photonic Crystal Waveguides (PCWGs) can be kept constant when the waveguide’s structure changes along the propagation direction. This suggests that the principle of constant group velocity matching may be utilized to improve impedance matching between different types of PCWGs while at the same time providing significant design flexibility. We illustrate this principle through the design of several efficient coupling structures between two different PCWGs via a local density of states and Fourier transform analysis of the associate electromagnetic fields. The couplers consist of heterostructures whose individual sections exhibit rather distinct structural parameters. Furthermore, we compare these structures to an adiabatic coupler.
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页码：387 / 394
页数：7
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