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Open AccessArticle

Extending Absorption Edge through the Hybrid Resonator-Based Absorber with Wideband and Near-Perfect Absorption in Visible Region

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Department of Materials Science and Engineering, National Cheng Kung University, Tainan 70101, Taiwan
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Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan
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Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University, Tainan 70101, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2020, 13(6), 1470; https://doi.org/10.3390/ma13061470
Received: 15 February 2020 / Revised: 21 March 2020 / Accepted: 23 March 2020 / Published: 24 March 2020
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. View Full-Text
Keywords: light absorber; optical metamaterials; resonances; broadband absorption light absorber; optical metamaterials; resonances; broadband absorption
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MDPI and ACS Style

Lai, Y.-C.; Chen, C.-Y.; Hung, Y.-T.; Chen, C.-Y. Extending Absorption Edge through the Hybrid Resonator-Based Absorber with Wideband and Near-Perfect Absorption in Visible Region. Materials 2020, 13, 1470.

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