Abstract
We have measured the photonic bandstructure of GaAs photonic-crystal waveguides with high resolution in energy as well as in momentum using near-field scanning optical microscopy. Intriguingly, we observe additional bands that are not predicted by eigenmode solvers, as was recently demonstrated by Huisman et al. [Phys. Rev. B 86, 155154 (2012)]. We study the presence of these additional bands by performing measurements of these bands while varying the incident light power, revealing a non-linear power dependence. Here, we demonstrate experimentally and theoretically that the observed additional bands are caused by a waveguide-specific near-field tip effect not previously reported, which can significantly phase-modulate the detected field.
Original language | English |
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Article number | 033104 |
Number of pages | 6 |
Journal | Journal of Applied Physics |
Volume | 117 |
Issue number | 3 |
Early online date | 20 Jan 2015 |
DOIs | |
Publication status | Published - 21 Jan 2015 |
Keywords
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