Efficient slow-light coupling in a photonic crystal waveguide without transition region
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We consider the coupling into a slow mode that appears near an inflection point in the band structure of a photonic crystal waveguide. Remarkably, the coupling into this slow mode, which has a group index n(g) > 1000, can be essentially perfect without any transition region. We show that this efficient coupling occurs thanks to an evanescent mode in the slow medium, which has appreciable amplitude and helps satisfy the boundary conditions but does not transport any energy. (C) 2008 Optical Society of America
White , T P , Botten , L C , de Sterke , C M , Dossou , K B & McPhedran , R C 2008 , ' Efficient slow-light coupling in a photonic crystal waveguide without transition region ' Optics Letters , vol 33 , no. 22 , pp. 2644-2646 . DOI: 10.1364/OL.33.002644
(c) 2008 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at http://www.opticsinfobase.org
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