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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 21 — Oct. 17, 2005
  • pp: 8380–8389

The effect of interfacial roughness on the normal incidence bandgap of one-dimensional photonic crystals

Karlene Rosera Maskaly, W. Craig Carter, Richard D. Averitt, and James L. Maxwell  »View Author Affiliations

Optics Express, Vol. 13, Issue 21, pp. 8380-8389 (2005)

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As discussed previously, interfacial roughness in one-dimensional photonic crystals (1DPCs) can have a significant effect on their normal reflectivity at the quarter-wave tuned wavelength. We report additional finite-difference time-domain (FDTD) simulations that reveal the effect of interfacial roughness on the normal-incidence reflectivity at several other wavelengths within the photonic bandgaps of various 1DPC quarter-wave stacks. The results predict that both a narrowing and red-shifting of the bandgaps will occur due to the roughness features. These FDTD results are compared to results obtained when the homogenization approximation is applied to the same structures. The homogenization approximation reproduces the FDTD results, revealing that this approximation is applicable to roughened 1DPCs within the parameter range tested (rms roughnesses < 20% and rms wavelengths < 50% of the photonic crystal periodicity) across the entire normal incidence bandgap.

© 2005 Optical Society of America

OCIS Codes
(230.1480) Optical devices : Bragg reflectors
(240.5770) Optics at surfaces : Roughness

ToC Category:
Research Papers

Original Manuscript: July 25, 2005
Revised Manuscript: September 26, 2005
Published: October 17, 2005

Karlene Maskaly, W. Carter, Richard Averitt, and James Maxwell, "The effect of interfacial roughness on the normal incidence bandgap of one-dimensional photonic crystals," Opt. Express 13, 8380-8389 (2005)

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  14. Previously, we have referred to the quantity reported in Eq. (2) as the �??percent�?? change in reflectivity. Here, we have changed the wording to �??relative�?? as it is a more accurate description of the quantity in Eq. (2). Please note this change when comparing this manuscript to our previous ones.
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