Extraction of optical Bloch modes in a photonic-crystal waveguide

Details Extraction of optical Bloch modes in a photonic-crystal waveguide Extraction of optical Bloch modes in a photonic-crystal waveguide

2011-10-25

arxiv.org/abs/1110.5539v2

Physics

Optics

Scientific paper

We perform phase-sensitive near-field scanning optical microscopy on photonic-crystal waveguides. The observed intricate field patterns are analyzed by spatial Fourier transformations, revealing several guided TE- and TM-like modes. Using the reconstruction algorithm proposed by Ha, et al. (Opt. Lett. 34 (2009)), we decompose the measured two-dimensional field pattern in a superposition of propagating Bloch modes. This opens new possibilities to study specific modes in near-field measurements. We apply the method to study the transverse behavior of a guided TE-like mode, where the mode extends deeper in the surrounding photonic crystal when the band edge is approached.

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