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Design of highly transparent conductive optical coatings optimized for oblique angle light incidence

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Abstract

In this paper, three deposition techniques are combined to create a window material with high average transmission at oblique angles of incidence. Spectrophotometry and ellipsometry measurements, respectively, yield the optical constants n and k. In contrast with other analyses on the subject, a high average transmission, higher than 91% in the 450–900 nm spectral range, is obtained at incident angles of 20–25°. The refractive index and extinction coefficient are determined by the Swanepoel method. The iterative optimization performed using the OpenFilters software leads to an antireflection (AR) multilayer with low reflection and high transmission. The surface quality of the films was characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), which revealed compact, continuous, and smooth films.

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Acknowledgements

This work was supported by a grant from the Romanian Ministry of Education and Research, Project PN-IIIP2-2.1-PED-2019-0085 CONTRACT 447PED/2020 for Institute of Solid Mechanics, Romanian, and through the Core Program 21N/2019 for National Institute of Materials Physics. The authors thank Dr. Constantin Logofătu and Dr. Cătălin Negrilă from NIMP for the XPS measurements and also Dr.Lucian Trupină for AFM measurements.

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Authors and Affiliations

  1. Institute of Solid Mechanics, Romanian Academy, 15 Constatin Mille, 010141, Bucharest, Romania

    N. Nedelcu, V. Chiroiu, L. Munteanu, I. Girip & C. Rugina

  2. National Institute of Materials Physics, 405A Atomiştilor St., 077125 IF, Magurele, Romania

    A. Lőrinczi & E. Matei

  3. MGM Star Construct Ltd., Pancota St., 022773, Bucharest, Romania

    A. Sobetkii

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  1. N. Nedelcu
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Nedelcu, N., Chiroiu, V., Munteanu, L. et al. Design of highly transparent conductive optical coatings optimized for oblique angle light incidence. Appl. Phys. A 127, 575 (2021). https://doi.org/10.1007/s00339-021-04726-z

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