Multilayer Photonic Crystal for Spectral Narrowing of Emission

Zhanfang LIU, Dan WANG, Jiao FENG, Hong ZHOU, Guannan ZHANG, Zhenwen SUN, Jun ZHU, Kai SONG


Multilayer colloidal crystal has been prepared by the layer-by-layer deposition of silica microspheres on a glass slide. Each layer is a slab consisting of a fcc close-packed colloidal arrays. By properly choosing the sizes of spheres, the whole spectral feature of multilayer colloidal crystal can be tuned. Here, we engineered a multilayer superlattice structure with an effective passband between two stop bands. This gives a strong narrowing effect on emission spectrum. With the stop bands at the shortwave and longwave edges of emission spectrum, the passband in the central wavelength region can be regarded as a strong decrease of suppression effect and enhancement of a narrow wavelength region of emission. The spectral narrowing modification effect of suitably engineered colloidal crystals shows up their importance in potential application as optical filters and lasing devices.



photonic crystal, stop band, passband, spectral narrowing, emission spectrum

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Print ISSN: 1392–1320
Online ISSN: 2029–7289