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Authors: H. Gersen, T.J. Karle, R.J.P. Engelen, W. Bogaerts, J.P. Korterik, N.F. van Hulst, T.F. Krauss, L. Kuipers
Title: Direct observation of Bloch harmonics and negative phase velocity in photonic crystal waveguides
Format: International Journal
Publication date: 4/2005
Journal/Conference/Book: Physics Review Letters
Volume(Issue): 94(12) p.123901
DOI: 10.1103/physrevlett.94.123901
Citations: 72 (Web of Knowledge / Dimensions.ai - last update: 16/9/2020)
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Abstract

The eigen eld distribution and band-structure of a photonic crystal waveguide have been measured
with a phase-sensitive near- eld 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 positive group velocity.
The lateral mode pro le for modes separated by one reciprocal lattice vector is found to be
di erent.

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