Abstract-Broadband one-way propagation and rainbow trapping of terahertz radiations

Jie Xu, Sanshui Xiao, Chiaho Wu, Hang Zhang, Xiaohua Deng, and Linfang Shen

Fig. 1 Schematics of the metal-semiconductor-dielectric-metal (a) and related semiconductordielectric-metal (b) structures for sustaining one-way SMPs. An external dc magnetic field is applied along the −y direction in the two structures.

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-8-10659

Surface magnetoplasmon (SMP) supported at an interface between magnetized plasmonic and dielectric materials has been widely explored; however, it suffers with narrow bandwidth for one-way propagation. Here we propose a novel metal-semiconductor-dielectricmetal (MSDM) structure showing the large bandwidth for the complete one-way propagation (COWP). Because of the compression of the zone for two-way propagating modes in the semiconductor layer by reducing semiconductor thickness, the bandwidth is significantly increased by several times. More importantly, in such MSDM structure, the SMP dispersion can be engineered by controlling the semiconductor thickness, and based on this, slowing wave and trapping rainbow can be realized in a tapered system at terahertz frequencies.

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