Abstract

In this Letter, a periodic structure in which each unit cell consists of one manganese oxide (La0.7Ca0.3MnO3) strip and two gold strips is designed. By simulating the electromagnetic responses of the structure, we confirm that Fano resonances can be actively controlled in the infrared region by modulating the intensity of the external magnetic field applied to the structure. This is due to the colossal magneto-resistance of the La0.7Ca0.3MnO3 material. Furthermore, a transmission phase can also be effectively tuned. The phase has a shift of ΔΦ=1.05rad at a frequency of 130 THz when the intensity of the external magnetic field varies from 5083 to 5193kA/m. Such a tunable method has potential applications in controllable photoelectric elements.

© 2015 Optical Society of America

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