In this work, we report the design of a wavelength-tunable infraredmetamaterial by exciting magnetic resonance with phase transition of vanadiumdioxide (VO2). Numerical simulation shows a broad absorption peak at thewavelength of 10.9 um when VO2 is a metal, but it shifts to 15.1 um when VO2changes to dielectric phase below its phase transition temperature of 68degC.The large tunability of 38.5% in the resonance wavelength stems from thedifferent excitation conditions of magnetic resonance assisted by plasmon inmetallic VO2 but optical phonons in dielectric VO2. The physical mechanism iselucidated with the aid of electromagnetic field distribution at the resonancewavelengths. A hybrid magnetic resonance mode due to plasmon-phonon coupling isalso discussed. The results here would be beneficial for active control innovel electronic, optical and thermal devices.
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