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

Authors :
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
Source :
AIP Advances, Vol 14, Iss 3, Pp 035036-035036-8 (2024)
Publication Year :
2024
Publisher :
AIP Publishing LLC, 2024.

Abstract

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.

Subjects

Subjects :
Physics
QC1-999

Details

Language :
English
ISSN :
21583226
Volume :
14
Issue :
3
Database :
Directory of Open Access Journals
Journal :
AIP Advances
Publication Type :
Academic Journal
Accession number :
edsdoj.5627780319024e3dbedd387a72e0e3bb
Document Type :
article
Full Text :
https://doi.org/10.1063/5.0188695