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Publication detail
| 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 | | Internal Reference: | [N-379] | | Download: |
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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. Related Research Topics
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