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Experimental observation of evanescent modes at the interface to slow-light photonic crystal waveguides

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SpasenovicOpticsLetters36ExperimentalObservation2011.pdf (414.7Kb)
Date
01/04/2011
Author
Spasenovic, Marko
White, Tom P
Ha, Sangwoo
Sukhorukov, Andrey A.
Kampfrath, Tobias
Kivshar, Yuri S.
de Sterke, C. Martijn
Krauss, Thomas Fraser
Kuipers, L. (Kobus)
Keywords
QC Physics
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Abstract
We experimentally study the fields close to an interface between two photonic crystal waveguides that have different dispersion properties. After the transition from a waveguide in which the group velocity of light is v(g) similar to c/10 to a waveguide in which it is v(g) similar to c/100, we observe a gradual increase in the field intensity and the lateral spreading of the mode. We attribute this evolution to the existence of a weakly evanescent mode that exponentially decays away from the interface. We compare this to the situation where the transition between the waveguides only leads to a minor change in group velocity and show that, in that case, the evolution is absent. Furthermore, we apply novel numerical mode extraction techniques to confirm experimental results. (C) 2011 Optical Society of America
Citation
Spasenovic , M , White , T P , Ha , S , Sukhorukov , A A , Kampfrath , T , Kivshar , Y S , de Sterke , C M , Krauss , T F & Kuipers , L 2011 , ' Experimental observation of evanescent modes at the interface to slow-light photonic crystal waveguides ' , Optics Letters , vol. 36 , no. 7 , pp. 1170-1172 . https://doi.org/10.1364/OL.36.001170
Publication
Optics Letters
Status
Peer reviewed
DOI
https://doi.org/10.1364/OL.36.001170
ISSN
0146-9592
Type
Journal article
Rights
© 2011 Optical Society of America. This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at http://www.opticsinfobase.org
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/2851

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