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Micromachines (Basel). 2019 Jan 20;10(1). pii: E73. doi: 10.3390/mi10010073.

Optical Properties of Au-based and Pt-based Alloys for Infrared Device Applications: A Combined First Principle and Electromagnetic Simulation Study.

Author information

1
Department of Engineering Science and Ocean Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10607, Taiwan. peter810601@gmail.com.
2
Department of Engineering Science and Ocean Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 10607, Taiwan. jiahan@ntu.edu.tw.
3
International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. NAGAO.Tadaaki@nims.go.jp.
4
Department of Condensed Matter Physics Graduate School of Science, Hokkaido University, Kita-10 Nishi-8 Kita-ku, Sapporo 060-0810, Japan. NAGAO.Tadaaki@nims.go.jp.

Abstract

Due to the rapid progress in MEMS-based infrared emitters and sensors, strong demand exists for suitable plasmonic materials for such microdevices. We examine the possibility of achieving this goal by alloying other metals with the noble metals Au and Pt, which have some drawbacks, such as low melting point, structural instability, and high costs. The six different metals (Ir, Mo, Ni, Pb, Ta, and W) which possess good properties for heat resistance, stability, and magnetism are mixed with noble metals to improve the properties. The optical properties are calculated by density functional theory and they are used for further investigations of the optical responses of alloy nanorods. The results show that the studied alloy nanorods have wavelength selective properties and can be useful for infrared devices and systems.

KEYWORDS:

alloy; first principle; gold; infrared device; permittivity; platinum; quality factor

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