期刊
JOURNAL OF APPLIED PHYSICS
卷 122, 期 5, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4986250
关键词
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资金
- National Natural Science Foundation of China [61421002, 61575036]
- startup funding from University of Electronic Science and Technology of China
- National Youth 1000 Talents Program of China
- Changjiang Chair Program
The metal-insulator transition makes vanadium dioxide an attractive material for developing reconfigurable optoelectronic components. Here we report on dynamically tunable broadband absorbers consisting of planar multilayered thin films. By thermally triggering the phase transition of vanadium dioxide, the effective impedance of multilayered structures is tuned in or out of the condition of impedance matching to free-space, leading to switchable broadband absorptions. Two types of absorbers are designed and demonstrated by using either the insulating or metallic state of vanadium dioxide at the impedance matched condition. The planar multilayered absorbers exhibit tunable absorption bands over the wavelength ranges of 5-9.3 mu m and 3.9-8.2 mu m, respectively. A large modulation depth up to 88% is measured. The demonstrated broadband absorbance tunability is of potential interest for reconfigurable bolometric sensing, camouflaging, and modulation of mid-infrared lights. Published by AIP Publishing.
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