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Scanning electron microscopy image of the lithium niobate W1 PhC waveguide.
SNOM images (topography and optical near-field) recorded above the lithium niobate W1 PhC waveguide for an excitation wavelength of (a) and (b) .
Spatial Fourier transforms of the intensity measured above the line defect, (a) at and (b) at .
TE-polarization band diagram of the lithium niobate W1 PhC waveguide. Curves: obtained from 3D FEM simulations (decreasing curve: fundamental mode; non-monotonic curve inside the band gap: higher order mode; gray zone: continuum of Bloch modes). Points: experimental Bloch vectors retrieved from SNOM images. Black squares, red dots, and blue triangles correspond to the spatial frequencies , , and of Fig. 3, respectively.
Experimental and calculated transmission spectra of the lithium niobate W1 PhC waveguide recorded off the input facet. For comparison, the experimental spectrum was scaled to the maximum transmission of the calculated one.
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