Optical and structural properties of Nb2O5-SiO2 mixtures in thin films

SURFACE & COATINGS TECHNOLOGY

卷:206

Article

Janicki, Vesna¹  Sancho-Parramon, Jordi^1,2  Yulin, Sergiy³  Flemming, Marcel⁴  Chuvilin, Andrey⁴ 

[1] Rudjer Boskovic Inst, Zagreb 10000, Croatia

[2] Univ Barcelona, Dept Fis Aplicada & Opt, E-08028 Barcelona, Spain

[3] Fraunhofer Inst Angew Opt & Feinmech IOF, D-07745 Jena, Germany

[4] Univ Ulm, D-89069 Ulm, Germany

关键词: Optical characterization;    Optical properties;    Structural properties;    Material mixture;    Effective medium theory;   

DOI  :  10.1016/j.surfcoat.2012.03.015

来源: Elsevier

【 摘 要 】

Mixed material thin films are used in gradient index optical systems as their refractive index can be tailored to meet requirements. For the system to meet the optical performance requirements, it is necessary to relate the refractive index profile of the design to the volume fraction of the components of the mixture. Here we report that for electron-beam co-deposited Nb2O5-SiO2 mixtures, the most appropriate effective medium theory is Lorentz-Lorenz theory. The optical properties of a mixture are related to the structure of the composite. The structural properties of the mixtures studied justify the appropriateness of Lorentz-Lorenz theory for this kind of effective medium. (C) 2012 Elsevier B.V. All rights reserved.

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