Slow-light and evanescent modes at interfaces in photonic crystal waveguides: optimal extraction from experimental near-field measurements

Sangwoo Ha, Marko Spasenovic, Andrey A. Sukhorukov, Tom P White, C. Martijn de Sterke, L. Kobus Kuipers, Thomas Fraser Krauss, Yuri S. Kivshar

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)
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Abstract

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

Original languageEnglish
Pages (from-to)955-963
Number of pages9
JournalJournal of the Optical Society of America B : Optical Physics
Volume28
Issue number4
DOIs
Publication statusPublished - Apr 2011

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