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  4. Micro-optically assisted high-index waveguide coupling
 
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2006
Journal Article
Title

Micro-optically assisted high-index waveguide coupling

Abstract
Adapting the concept of solid immersion lenses, we numerically study a micro-optical scheme for conventional high-index and photonic-crystal waveguide coupling by using a combination of different numerical methods such as ray tracing, angular-spectrum propagation, finite-difference time-domain simulations, and finite-element-method simulations. The numerical findings are discussed by means of impedance, group- or energy-velocity, spot-size, and phase-matching criteria. When fabrication constraints for high-index immersion lenses made of silicon are taken into account, a coupling efficiency of about 80% can be reached for monomode silicon-on-insulator waveguides with a quadratic cross section of the core and rectangular cross sections of moderate aspect ratio. Similar coupling efficiencies of ?80% can be obtained for silicon-on-insulator photonic-crystal waveguides. Tolerances that are due to misalignments and variations of the substrate thickness of the silicon lens are discussed.
Author(s)
Michaelis, D.
Wächter, C.
Burger, S.
Zschiedrich, L.
Bräuer, A.
Journal
Applied optics  
DOI
10.1364/AO.45.001831
Language
English
Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF  
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