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arXiv · 1410.1285

Observation of nonlinear bands in near-field scanning optical microscopy of a photonic-crystal waveguide

Amandev Singh·Georgios Ctistis·Simon R. Huisman·Jeroen P. Korterik·Allard P. Mosk·Jennifer L. Herek·Pepijn W. H. Pinkse
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Abstract

We have measured the photonic bandstructure of GaAs photonic-crystal waveguides with high energy and momentum resolution 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.

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Amandev Singh, Georgios Ctistis, Simon R. Huisman, Jeroen P. Korterik, Allard P. Mosk, Jennifer L. Herek, Pepijn W. H. Pinkse. 2014-10-06. Observation of nonlinear bands in near-field scanning optical microscopy of a photonic-crystal waveguide. https://doi.org/10.1063/1.4906146

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