Abstract
We investigate the impact of disorder on the propagation of photonic
crystal waveguide modes using phase-sensitive optical low-coherence reflectometry.
Combined with a suitable numerical processing, this technique reveals a considerable
amount of information that we cast as time-wavelength reflectance maps. By
comparing measurements on different samples, we easily identify inter-mode
scattering and propagation losses mediated by slow leaky modes. We also characterize
the dispersive behaviour of point defects. Our results verify previous theoretical
predictions about the general group velocity scaling of losses and the dominant
role of backscattering.
© 2008 IEEE
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