Terahertz characterization of nano-scale high-entropy alloy films and their high-contrast grating applications

Chia Yen Lu, Yi Chen Sung, Cheng Hsien Yeh, Yu Hua Chen, Chen Yun Kuan, Kuang Teng Hung, Wei Hsiang Chen, Wen Dung Hsu*, Chuan Feng Shih*, Chan Shan Yang*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

摘要

We investigated the optical constants of thin films of the Nb25Mo25Ta25W25 alloy, which belongs to high-entropy alloys (HEAs), with a transmission terahertz (THz) measurement system and discovered that the refractive index, extinction coefficient, and conductivity of the HEA thin film measured in the range of 0.3-1.0 THz all increased as the thickness of the thin film increased (the thickness was maintained in the range between 10 and 40 nm). According to the experimental results, this alloy with a high refractive index is suitable for producing high-contrast gratings (HCGs). The principle behind achieving a high contrast with a high-reflection HEA grating is to harness the confined plasmonic energy within the grating, thereby enhancing the localized plasmonic energy within the grating. This work elucidates that we can not only fabricate THz components by controlling the thickness of the thin film but also utilize the high refractive index of this material to create HCGs.

原文英語
文章編號035036
期刊AIP Advances
14
發行號3
DOIs
出版狀態已發佈 - 2024 3月 1

ASJC Scopus subject areas

  • 一般物理與天文學

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