Terahertz switching between broadband absorption and narrowband absorption
Terahertz switching between broadband absorption and narrowband absorption
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DOI：
10.1364/oe.376085
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发表时间：
2020-01-20
期刊：
影响因子：
3.8
通讯作者：
Zhang, Jiahe
中科院分区：
文献类型：
--
作者：
Song, Zhengyong;Chen, Apeng;Zhang, Jiahe
基于二氧化钒的相变特性，提出了一种具有可开关功能的多层超材料。当二氧化钒处于金属状态时，形成宽带吸收体。计算结果表明，在0.393 ~ 0.897 THz的宽光谱范围内，两个吸收峰的组合使吸收率大于90%.吸收性能在小入射角下对偏振不敏感，即使在大入射角下也能很好地工作。当二氧化钒处于绝缘状态时，所设计的系统在0.677 THz处表现为窄带吸收体。这种窄带吸收体由于局部磁共振而显示出宽角度和偏振不敏感的优点。讨论了几何参数对吸收率的影响。所提出的可切换吸收体可用于各种应用，例如选择性热发射器和太阳能光伏领域。(C)根据OSA开放获取出版协议的条款，2020年美国光学学会
A multilayer metamaterial with switchable functionalities is presented based on the phase-transition property of vanadium dioxide. When vanadium dioxide is in the metallic state, a broadband absorber is formed. Calculated results show that the combination of two absorption peaks enables absorptance more than 90% in the wide spectral range from 0.393 THz to 0.897 THz. Absorption performance is insensitive to polarization at the small incident angle and work well even at the larger incident angle. When vanadium dioxide is in the insulating state, the designed system behaves as a narrowband absorber at the frequency of 0.677 THz. This narrowband absorber shows the advantages of wide angle and polarization insensitivity due to the localized magnetic resonance. Furthermore, the influences of geometrical parameters on the performance of absorptance are discussed. The proposed switchable absorber can be used in various applications, such as selective heat emitter and solar photovoltaic field. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement