|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]|
The eigeneld 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 prole for modes separated by one reciprocal lattice vector is found to be
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