31 May 2011 Hybrid colloidal crystal for photonic application
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We report on the fabrication and characterization of opal-based photonic crystal heterostructures. These heterostructures are created by using multilayer deposition of silica and polystyrene spheres. In the specific the fabricated structures involved both different lattice constant and dielectric function. Scanning electron microscopy (SEM) and NIR-VIS transmittance and reflectance spectroscopy are used to characterize the systems. The SEM images show good ordering of the two-layer colloidal crystals constituting the heterostructures. The transmittance and reflectance spectra measured from the (111) plane of the heterostructure show that the composite colloidal photonic crystals have double photonic stop bands that matches the stop bands of the individual photonic crystals. This behaviour can be seen as a superposition of the properties of each individual layer.
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A. Chiappini, C. Armellini, N. Bazzanella, A. Carpentiero, G. C. Righini, M. Ferrari, "Hybrid colloidal crystal for photonic application", Proc. SPIE 8069, Integrated Photonics: Materials, Devices, and Applications, 80690I (31 May 2011); doi: 10.1117/12.886825; https://doi.org/10.1117/12.886825


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