期刊
MATERIALS
卷 13, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/ma13061470
关键词
light absorber; optical metamaterials; resonances; broadband absorption
类别
资金
- Ministry of Science and Technology of Taiwan [MOST 108-2221-E-006-221-MY4, MOST 107-2221-E-006-013-MY3]
- Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from the Featured Areas Research Center Program by the Ministry of Education (MOE)
- Ministry of Science and Technology in Taiwan [MOST 107-3017-F-006-003]
Metamaterial absorber with the unexpected capability for harvesting electromagnetic energy has been regarded as a potential route for various applications, including chemical/biological sensing, cloaking and photovoltaic applications. In this study, we presented the simple absorber design made with Al/SiO2/Al sandwich structures through the involvement of hybrid dual-resonators that could allow the wideband light absorption covered from 450 nm to 600 nm with average absorptivity above 95%. Examinations of excited electric field, magnetic field and total magnitude of electric field in three-dimensional space at resonances were performed to clarify the origin of resonant behaviors. In addition, an equivalent inductance-capacitance circuit model was proposed that could qualitatively explore the geometry-dependent absorption characteristics by modulating the constitutive parameters of hybrid resonators. As a result, the designed light absorber might enable to be practically applied for various optical-management and photovoltaic applications, and even offered the tunability for other desired frequency regions.
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