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Please use this identifier to cite or link to this item: http://hdl.handle.net/10023/2482
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Title: Loss engineered slow light waveguides
Authors: O'Faolain, Liam
Schulz, Sebastian Andreas
Beggs, Daryl Matthew
White, Tom P
Spasenovic, M.
Kuipers, L.
Morichetti, F.
Melloni, A.
Mazoyer, S.
Hugonin, J. P.
Lalanne, P.
Krauss, Thomas Fraser
Keywords: Photonic crystals
Pulse-compression
Silicon
Ultracompact
Enhancement
Conversion
Bandwidth
Issue Date: 20-Dec-2010
Citation: O'Faolain , L , Schulz , S A , Beggs , D M , White , T P , Spasenovic , M , Kuipers , L , Morichetti , F , Melloni , A , Mazoyer , S , Hugonin , J P , Lalanne , P & Krauss , T F 2010 , ' Loss engineered slow light waveguides ' Optics Express , vol 18 , no. 26 , pp. 27627-27638 .
Abstract: Slow light devices such as photonic crystal waveguides (PhCW) and coupled resonator optical waveguides (CROW) have much promise for optical signal processing applications and a number of successful demonstrations underpinning this promise have already been made. Most of these applications are limited by propagation losses, especially for higher group indices. These losses are caused by technological imperfections ("extrinsic loss") that cause scattering of light from the waveguide mode. The relationship between this loss and the group velocity is complex and until now has not been fully understood. Here, we present a comprehensive explanation of the extrinsic loss mechanisms in PhC waveguides and address some misconceptions surrounding loss and slow light that have arisen in recent years. We develop a theoretical model that accurately describes the loss spectra of PhC waveguides. One of the key insights of the model is that the entire hole contributes coherently to the scattering process, in contrast to previous models that added up the scattering from short sections incoherently. As a result, we have already realised waveguides with significantly lower losses than comparable photonic crystal waveguides as well as achieving propagation losses, in units of loss per unit time (dB/ns) that are even lower than those of state-of-the-art coupled resonator optical waveguides based on silicon photonic wires. The model will enable more advanced designs with further loss reduction within existing technological constraints. (C) 2010 Optical Society of America
Version: Publisher PDF
Status: Peer reviewed
URI: http://hdl.handle.net/10023/2482
DOI: http://dx.doi.org/10.1364/OE.18.027627
ISSN: 1094-4087
Type: Journal article
Rights: (c) 2010 OSA. 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/oe/abstract.cfm?URI=oe-18-26-27627
Appears in Collections:University of St Andrews Research
Physics & Astronomy Research



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