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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 2,
  • Issue 8,
  • pp. 471-474
  • (2004)

Crystal thickness and sphere dispersion dependence of the photonic band gap of silica colloidal crystals

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Abstract

Experimental results demonstrate that the band gap of colloidal suspension crystal changes with both the thickness of crystal and the dispersity of micro-spheres. As the thickness decreases, a red shift of band gap is observed, and there is a maximum of red shift. The values of the maximum red shifts are dependent on the standard deviations of micro-spheres. The experimental results are consistent with theoretical calculation. As the colloidal suspension crystal is assembled from micro-spheres with a standard deviation of 8.4% in a thick cell, an incident angles independent broadband is observed, which is explained as an amorphous structure. Two amorphous models are discussed.

© 2005 Chinese Optics Letters

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