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Phys Rev Lett. 2003 Jul 25;91(4):043901. Epub 2003 Jul 21.

Multiple higher-order stop gaps in infrared polymer photonic crystals.

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Centre for Micro-Photonics and ARC Centre of Excellence for Ultrahigh-Bandwidth Devices for Optical Systems, School of Biophysical Sciences and Electrical Engineering, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia.


Engineering of stop gaps between higher photonic bands provides an alternative to miniaturization of photonic crystals. Femtosecond laser microfabrication of highly correlated void channel polymer microstructures results in photonic crystals with large stop gaps and a multitude of higher-order gaps in the mid- and near-infrared spectral regions. The gap wavelengths obey Bragg's law. Consistent with theory, varying the woodpile structure unit cell allows for tuning the number of higher-order gaps, and transitions from mere resonant Bragg scattering to stop band total reflection are observed.

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