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Resonant perfect absorption of molybdenum disulfide beyond the bandgap |
Hao Yu(于昊)1, Ying Xie(谢颖)1,†, Jiahui Wei(魏佳辉)1, Peiqing Zhang(张培晴)1, Zhiying Cui(崔志英)2, and Haohai Yu(于浩海)3 |
1 Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, China; 2 Ningbo Yongxin Optics, Co., Ltd., Ningbo 315211, China; 3 State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Jinan 250100, China |
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Abstract Light absorption and radiation are fundamental processes in optical science and engineering. Materials with perfect absorption properties play an important role in numerous optical applications. Following the meteoric rise of MoS2 material, global opportunities and challenges coexist due to its extremely weak light-matter interaction capability beyond its energy band. In this work, we designed a kind of sandwich resonance structure and investigated MoS2 as a perfect absorber in the infrared spectrum that should be transparent according to the optical band theory. The infrared absorption properties of W or Au/MoS2/Au models at 800 nm-2400 nm were systematic simulated. By optimizing the structural parameters, the resonant wavelength of perfect absorption can be modulated from 830 nm to 1700 nm with angle insensitivity and polar independence. Moreover, we discovered that the bandwidth of absorption exceeding 50% of the W-top model reaches 500 nm, while that of the Au-top model is less than 100 nm, indicating that the top metal material has a great influence on the resonance absorption spectrum. Our work provides a practical route for enhancing and manipulating the light-matter interactions of low-dimensional materials beyond their own band gaps, which will be critical in the future design and implementation of optoelectronic devices and systems.
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Received: 08 May 2022
Revised: 30 June 2022
Accepted manuscript online: 13 July 2022
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PACS:
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81.05.Xj
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(Metamaterials for chiral, bianisotropic and other complex media)
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02.70.Bf
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(Finite-difference methods)
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33.20.Ea
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(Infrared spectra)
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42.79.Ta
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(Optical computers, logic elements, interconnects, switches; neural networks)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62105169), Natural Science Foundation of Ningbo (Grant No. 2021J078), and Special fund for Talents Project of Ningbo University (Grant No. 432094940). |
Corresponding Authors:
Ying Xie
E-mail: xieying@nbu.edu.cn
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Cite this article:
Hao Yu(于昊), Ying Xie(谢颖), Jiahui Wei(魏佳辉), Peiqing Zhang(张培晴),Zhiying Cui(崔志英), and Haohai Yu(于浩海) Resonant perfect absorption of molybdenum disulfide beyond the bandgap 2023 Chin. Phys. B 32 048101
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