Tunable mid-infrared patch antennas based on VO2 phase transition |
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Authors: | Zhe Li Xuefei Wu Zhiming Wu Yadong Jiang Jimmy Xu |
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Affiliation: | 1. School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu, China;2. School of Engineering, Brown University, Providence, RI, USA |
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Abstract: | The metal-insulator phase transition in vanadium oxide makes it an attractive material for developing reconfigurable infrared optoelectronic components. In this paper, we present a tunable mid-infrared plasmonic patch antenna array based on vanadium oxide. The antennas consist of a circular gold patch array separated from a metallic ground plane by a film of vanadium dioxide. As the insulator-to-metal phase transition is thermally triggered, the resonances of the antenna array redshift with reduced absorbance before they are eventually switched off. The measured tuning range is about 10% of the resonant frequency, and the modulation depth in reflection is as high as 50%. A hysteresis loop in the tuning behavior is also observed. The XRD and XPS characterizations reveal a polycrystalline and multi-phase vanadium oxide. Our demonstrated tunable patch antennas hold promise for optical switching and modulating in mid-infrared applications. |
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Keywords: | Patch antenna resonance tunability phase-change material mid-infrared |
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