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Observation of unconventional optical diffraction in α-Fe2O3/Si two-dimensional photonic crystal slab fabricated by sol-gel method

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Abstract

The α-Fe2O3/Si two-dimensional (2D) photonic crystal (PC) with hexagonal honeycomb structure was fabricated by self-assembly and solution-dipping method based on colloidal monolayer template with 780 and 470 nm diameter polystyrene (PS) spheres. Optical diffraction measurement was carried out under wavelengths of 800, 532 and 400 nm. An interesting dispersion phenomenon with a hexagonal diffraction pattern composed of six elliptical spots is observed under specific wavelengths. Both theoretical and experimental calculations reveal that the diffraction can only occur when the incident wavelength is smaller than \(\sqrt{3}/2\) of lattice constant, and both the shape and distribution of these spots can be modified by the PC lattice constant and the incident wavelength. All these results reveal that optical properties of these 2D PC slabs are different from conventional diffractive devices.

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Acknowledgements

The authors acknowledge the financial support from the NSF of China (Grant Nos. 60976014, 60976004 and 11074075) and the Key Basic Research Project of Scientific and Technology Committee of Shanghai (Grant No. 09DJ1400200).

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Authors and Affiliations

  1. Key Laboratory of Polar Materials and Devices (Ministry of Education of China), Department of Electronic Engineering, East China Normal University, Shanghai, 200241, P.R. China

    Z. Zhang, K. Yu, B. Li, J. Zhu, H. Yin, L. Lou & Z. Zhu

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  1. Z. Zhang
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  2. K. Yu
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  3. B. Li
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  4. J. Zhu
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  5. H. Yin
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Correspondence to K. Yu.

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Zhang, Z., Yu, K., Li, B. et al. Observation of unconventional optical diffraction in α-Fe2O3/Si two-dimensional photonic crystal slab fabricated by sol-gel method. Appl. Phys. B 107, 119–124 (2012). https://doi.org/10.1007/s00340-011-4851-2

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  • DOI: https://doi.org/10.1007/s00340-011-4851-2

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