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Annealing effect on reflectivity spectra of opal photonic crystals |
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| Authors: | V S Gorelik Yu P Voinov G A Emel’chenko V M Masalov N I Yurasov V V Gryaznov |
| Affiliation: | (1) Lebedev Institute of Physics, Russian Academy of Sciences, Leninskii pr. 53, Moscow, 119991, Russia;(2) Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia;(3) Bauman State Technical University, Vtoraya Baumanskaya ul. 5, Moscow, 107005, Russia |
| Abstract: | We analyze broadband visible reflectivity spectra of opal photonic crystals annealed in an argon atmosphere and air. Scanning electron microscopic examination has shown that the crystals consist of close-packed spheres with a mean diameter in the range 200–290 nm. Incorporation of even small amounts of carbon (?0.5 wt %) increases the density of the opal matrix. The presence of carbon shifts the Bragg reflection peak of the opal and increases its intensity. |
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