Spectroscopy of photonic bands in macroporous silicon photonic crystals

  • Galli M
  • Agio M
  • Andreani L
 et al. 
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Variable-angle reflectance performed on macroporous silicon photonic crystals yields the dispersion of two-dimensional photonic bands. A comparison with calculated optical spectra identifies the spectral structures, which mark the onset of a propagating photonic mode, as one-dimensional critical points. The experimental results agree with theoretical determinations of the reflectance and of the photonic-band dispersion in a wide energy range. A symmetry analysis yields the selection rules for excitation of photonic modes, which can be treated like elementary excitations of the crystal.

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  • M. Galli

  • M. Agio

  • L. C. Andreani

  • M. Belotti

  • G. Guizzetti

  • F. Marabelli

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