Measured optical constants of Pd_(77.5)Cu_6Si_(16.5) bulk metallic glass

Creators: McMillon-Brown, Lyndsey; Bordeenithikasem, Punnathat; Pinnock, Ferra; Ketkaew, Jittisa; Martin, Andrew C.; Schroers, Jan; Taylor, André D.

Abstract

Optical constants of Pd_(77.5)Cu_6Si_(16.5) alloy were determined experimentally using spectroscopic ellipsometry measurements on bulk specimens. Values of the complex refractive index of the glassy metallic alloys are compared to their crystalline counterparts and to pure crystalline Pd. The presence of Cu and Si increase the occurrence of defects in the crystal lattice resulting in reduced refractive index in the crystalline alloy when compared to pure crystalline Pd. Moreover, we show the conduction band energy of each specimen using Tauc's plot. The obtained complex refractive index across the spectrum (250 – 1500nm) allows for accurate prediction of optical performance within the investigated spectral range providing optimal design for optical devices.

Additional Information

© 2019 Published by Elsevier B.V. Under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0). Available online 15 April 2019. The authors declare no competing financial interests. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper. Author contributions: The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. The authors are thankful for Timothy J. Peshek Ph.D. for thoughtful conversation and direction. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not constitute or imply its endorsements by the United States Government, NASA Glenn Research Center, or the NASA Jet Propulsion Laboratory, California Institute of Technology. The authors are grateful for support from National Science Foundation under grant no. MRSEC DMR 1119826 (CRISP). The combinatorial sputtering aspect of this work was supported by NSF DMR through award no. 1609391. Part of this research was done at the NASA Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. P. B's research was supported by an appointment to the NASA Postdoctoral Program at the NASA Jet Propulsion Laboratory, California Institute of Technology. The program is administered by Universities Space Research Association under contract with NASA.

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