Microdisk array based Weyl semimetal nanofilm terahertz detector

• Published in: Nanophotonics (Berlin, Germany) Vol. 11; no. 16; pp. 3595 - 3602
• Main Authors: Song, Qi, Zhou, Zhiwen, Zhu, Gangyi, Liang, Huawei, Zhang, Min, Zhang, Bingyuan, Liu, Fang, Yan, Peiguang
• Format: Journal Article
• Language: English
• Published: Germany De Gruyter 01.09.2022; Walter de Gruyter GmbH
• Subjects: Arrays; Communication; Design; Electrodes; Engineering; Epitaxial growth; Etching; Graphene; Information technology; Laboratories; microdisk array; Physics; Polaritons; Power supply; Remote sensing; Room temperature; Science; Sensors; Silicon wafers; Spectral sensitivity; Spectrum analysis; Substrates; terahertz detector; Terahertz frequencies; Weyl semimetal; Weyl semimetal; microdisk array; terahertz detector
• ISSN: 2192-8614; 2192-8606; 2192-8614
• DOI: 10.1515/nanoph-2022-0227

High-performance terahertz wave detectors at room temperature are still urgently required for a wide range of applications. The available technologies, however, are plagued by low sensitivity, narrow spectral bandwidth, complicated structure, and high noise equivalent power (NEP). Here, we have demonstrated a Weyl semimetal surface plasmon-enhanced high-performance terahertz wave detectors which are based on microdisk array deposited WTe nanofilm epitaxially grown on GaN substrate for room temperature operation. With the microdisk array combined the WTe layer, strong terahertz wave surface plasmon polaritons can be generated at the WTe –air interfaces, which results in significant improvement in detecting performance. For the 40 μm diameter microdisk array, a detectivity ( ) of 5.52 × 10  cm Hz pW at 0.1 THz is achieved at room temperature. In addition, the responsivity ( ) of 8.78 A W is also obtained. Such high-performance millimeter and terahertz wave photodetectors are useful for wide applications such as high capacity communications, walk-through security, biological diagnosis, spectroscopy, and remote sensing.