Fabrication of Artificially Stacked Ultrathin ZnS/MgF2 Multilayer Dielectric Optical Filters

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• 作者：Garima Kedawat ; Subodh Srivastava ; Vipin Kumar Jain ; Pawan Kumar ; Vanjula Kataria ; Yogyata Agrawal ; Bipin Kumar Gupta ; Yogesh K. Vijay
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2013
• 出版时间：June 12, 2013
• 年：2013
• 卷：5
• 期：11
• 页码：4872-4877
• 全文大小：390K
• 年卷期：v.5,no.11(June 12, 2013)
• ISSN：1944-8252

文摘

We report a design and fabrication strategy for creating an artificially stacked multilayered optical filters using a thermal evaporation technique. We have selectively chosen a zinc sulphide (ZnS) lattice for the high refractive index (n = 2.35) layer and a magnesium fluoride (MgF₂) lattice as the low refractive index (n = 1.38) layer. Furthermore, the microstructures of the ZnS/MgF₂ multilayer films are also investigated through TEM and HRTEM imaging. The fabricated filters consist of high and low refractive 7 and 13 alternating layers, which exhibit a reflectance of 89.60% and 99%, respectively. The optical microcavity achieved an average transmittance of 85.13% within the visible range. The obtained results suggest that these filters could be an exceptional choice for next-generation antireflection coatings, high-reflection mirrors, and polarized interference filters.

Keywords:

zinc sulphide; magnesium fluoride; multilayer thin film; X-ray diffraction; UV鈭抳is spectroscopy