Direct observation of Bloch harmonics and negative phase velocity in photonic crystal waveguides

H Gersen, TJ Karle, RJP Engelen, W Bogaerts, JP Korterik, NF van Hulst, TF Krauss, L Kuipers

Research output: Contribution to journalArticle (Academic Journal)peer-review

93 Citations (Scopus)
253 Downloads (Pure)

Abstract

The eigenfield distribution and the band structure of a photonic crystal waveguide have been measured with a phase-sensitive near-field scanning optical microscope. Bloch modes, which consist of more than one spatial frequency, are visualized in the waveguide. In the band structure, multiple Brillouin zones due to zone folding are observed, in which positive and negative dispersion is seen. The negative slopes are shown to correspond to a negative phase velocity but a positive group velocity. The lateral mode profile for modes separated by one reciprocal lattice vector is found to be different.
Translated title of the contributionDirect observation of Bloch harmonics and negative phase velocity in photonic crystal waveguides
Original languageEnglish
Pages (from-to)1 - 4
Number of pages4
JournalPhysical Review Letters
Volume94
Issue number12
DOIs
Publication statusPublished - 1 Apr 2005

Bibliographical note

Publisher: The American Physical Society

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