Abstract
A microwave one-way waveguide of three-dimensional configuration is proposed and investigated theoretically. In this waveguide there exists a complete one-way propagation band, where the mode propagates only in one direction and can be immune to backscattering. By terminating the one-way waveguide with metal slab, one-way propagating waves in this waveguide system can be stopped at the terminal end without any backscattering. Meanwhile, a hotspot with extremely enhanced magnetic-field amplitude is generated in this 3D waveguide system. For an incident microwave pulse, the trapped wave packet can be compressed to deep subwavelength scale besides the magnetic field enhancement. Moreover, the magnetic field enhancement of trapped waves can be further largely increased by tapering laterally the waveguide system. The approach for trapping microwaves has promising applications in magnetic sensing and magnetic non-linearity.
Highlights
Stopping light or electromagnetic (EM) radiation in all-optical systems is of great interest in fundamental science, and has a variety of prospective applications such as light harvesting[1,2], sensing[3], and enhanced non-linearity[4]
One-way surface magnetoplamons (SMPs) can be sustained by plasmonic materials under applied dc magnetic fields, which break the time-reversal symmetry of the systems[14,15]
By using semiconductors, which are gyro-electrically anisotropic under magnetization, one-way SMPs at terahertz frequencies can be realized with external magnetic field of normal intensity[15,16,17]
Summary
A microwave one-way waveguide of three-dimensional configuration is proposed and investigated theoretically. All one-way SMPs at terahertz or microwave frequencies reported previously are spatially two-dimensional (2D), i.e., their fields as well as the related systems are uniform and extend infinitely in the lateral direction This is the situation for trapped hotspots based on one-way SMPs. In this paper, a realistic one-way waveguide, which is a three-dimensional (3D) structure constructed by using YIG, is proposed and investigated theoretically.
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