期刊
PHYSICAL REVIEW A
卷 99, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.99.033820
关键词
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资金
- Zhejiang Provincial Natural Science Foundation of China [LR16A040001]
- National Natural Science Foundation of China [11574275, 11747025, 61464001]
- State Key Laboratory of Surface Physics in Fudan University [KF2017_4]
- Research Program of Science for Universities of Guang Xi Autonomous Region (Optical properties of metamaterials with disordered and gradient surfaces and the design of electromagnetic devices)
- Scientific Research Starting Foundation of Guangxi University of Science and Technology [16z03]
We demonstrate a magnetically controllable nonreciprocal Goos-Hanchen (GH) shift enabled by the magnetic plasmonic gradient metasurfaces (GMSs) consisting of an array of ferrite rods with a rotation gradient introduced to the rod dimers in the unit cell. The incident Gaussian beam is observed to exhibit an evident GH shift about 5 lambda when it is incident from one side, whereas for the Gaussian beam incident from the geometrically symmetric direction with respect to surface normal only a very small GH shift comes into appearance. The phenomenon arises from the unidirectional coupling of the incident beam with the magnetic plasmonic GMSs due to the time-reversal-symmetry-breaking nature of the magnetic system as evidenced from the photonic band diagrams of the edge states. The unidirectional GH shift can also be implemented at different incident angles by either engineering the gradient of the GMSs or tuning the bias magnetic field. By designing the magnetic plasmonic GMSs with more exquisite configurations we can expect a lot more nonreciprocal properties, adding additional freedom in manipulating electromagnetic waves.
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