Slow-light and evanescent modes at interfaces in photonic crystal waveguides: optimal extraction from experimental near-field measurements
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We develop a systematic approach for simultaneous extraction of the dispersion relations and profiles of multiple modes in periodic waveguides though a special global optimization procedure applied to near-field electric field measurements in the waveguide plane. We apply this method to perform in-depth analysis of experimental data on wave propagation close to an interface between waveguide sections with different dispersion characteristics, and we successfully identify several modes contributing to the experimentally measured fields. We find clear evidence that when the group velocity is reduced across the interface, evanescent modes that facilitate the excitation of propagating slow-light waves appear, confirming previous theoretical predictions. (C) 2011 Optical Society of America
Ha , S , Spasenovic , M , Sukhorukov , A A , White , T P , de Sterke , C M , Kuipers , L K , Krauss , T F & Kivshar , Y S 2011 , ' Slow-light and evanescent modes at interfaces in photonic crystal waveguides: optimal extraction from experimental near-field measurements ' Journal of the Optical Society of America B : Optical Physics , vol 28 , no. 4 , pp. 955-963 . DOI: 10.1364/JOSAB.28.000955
Journal of the Optical Society of America B : Optical Physics
© 2011 Optical Society of America. This paper was published in JOSA B: Optical Physics and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/JOSAB.28.000955.
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