Experimental demonstration of Bloch mode parity change in photonic crystal waveguide

Cluzel, B.; Gérard, D.; Picard, E.; Charvolin, T.; Calvo, V.; Hadji, E.; de Fornel, F.
October 2004
Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2682
Academic Journal
We experimentally show coupling between two photonic crystal waveguide Bloch modes having a different parity. A monomode ridge waveguide etched in a silicon-on-insulator substrate and connecting to the photonic crystal waveguide allows us to excite the even Bloch mode. Transmission measurements, performed on a broad spectral range, show the even mode propagation along the defect line. Then, spectrally resolved near-field patterns obtained by using a scanning near-field optical microscope in collection mode for wavelengths, inside and outside the multimode region of the photonic crystal waveguide, clearly demonstrate coupling phenomenon between even and odd modes.


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