Abstract
The reflection and transmission spectra of two-dimensional photonic crystal slabs show several asymmetric Fano resonances. The asymmetry is due to interference of a direct reflection from the slab with a resonant contribution due to coupling of light to a leaky waveguide mode [1]. In this work, we study the resonances in a photonic crystal slab by imaging the near-field of the propagating modes. This technique allows a separation of the direct and resonant contributions in the reflection and gives an unambiguous measure of the propagation length of the modes.
© 2009 IEEE
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