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

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.

6 pages, 5 figures

References in corpus (4)

• Cavity Quantum Electrodynamics with Anderson-localized Modes
• Experimental realization of highly-efficient broadband coupling of single quantum dots to a photonic crystal waveguide
• Experimental observation of strong photon localization in disordered photonic crystal waveguides
• Near-field imaging and frequency tuning of a high-Q photonic crystal membrane microcavity