Abstract
Ferrimagnetic material with remanence holds the potential to realize unidirectional propagation of the electromagnetic field by taking advantage of magnetoplasmon in the subwavelength regime. Here, we theoretically investigate magnetoplasmons in a layered structure consisting of a dielectric sandwiched by two magnetic materials with anti-parallel remanent magnetization directions, which shows a complete unidirectional propagating region for both even and odd symmetry modes when the thickness of the dielectric is smaller than a certain value. Additionally, the even symmetry mode supported by such a one-way waveguide can be effectively, with low insertion loss, excited by the fundamental transverse-electric mode of a traditional metal slab waveguide. Relying on low insertion loss and a one-way propagation feature, we propose a broadband and subwavelength isolator working at the microwave region. Our results demonstrate that remanence based magnetoplasmons provide a promising way to realize devices below the diffraction limit with new functionalities.
Highlights
Surface plasmons, collective oscillations of charge-carriers in conductors or doped semiconductors, provide subwavelength confinement of optical field, and hold a great potential in minimizing the scale of optical systems [1,2,3]
We theoretically investigate magnetoplasmons in a layered structure consisting of a dielectric sandwiched by two magnetic materials with anti-parallel remanent magnetization directions, which shows a complete unidirectional propagating region for both even and odd symmetry modes when the thickness of the dielectric is smaller than a certain value
We have demonstrated that broadband unidirectional propagation of MPs at microwave frequencies can be realized by use of the ferrimagnetic material with remanence
Summary
Collective oscillations of charge-carriers in conductors or doped semiconductors, provide subwavelength confinement of optical field, and hold a great potential in minimizing the scale of optical systems [1,2,3]. Though one-way MPs in such magneto-optical materials, from three-dimensional (3D) metals and doped semiconductors to two-dimensional graphene and black phosphorus, exhibit many alluring properties, the requirement of external magnetic field seriously hinders the miniaturization and integration of related optical devices. Based on remanence, it is possible for ferrimagnetic materials to support unidirectional propagating MPs without external magnetic field. One-way MP waveguide based on ferrimagnetic remanence is naturally an isolator for optical system at microwave frequencies. One-way MP based on the remanence of ferrimagnetic material and its application in isolator is seldom investigated so far. We theoretically investigate the dispersion properties of MPs in a ferrite-dielectricferrite layered structure without any external magnetic field Both ferrites in the system possess remanences but their magnetization directions are anti-parallel. Such isolator can be straightforwardly extended to the 3D case and has value of practical application
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