High-performance and compact broadband terahertz plasmonic waveguide intersection

Mingrui Yuan,Yongchang Lu,Ying Zhang,Weili Zhang,Yanfeng Li,Xueqian Zhang,Jiaguang Han,Ziying Zhang,Xixiang Zhang

doi:10.1515/nanoph-2019-0191

Mingrui Yuan, Yongchang Lu + Show 7 more

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https://doi.org/10.1515/nanoph-2019-0191

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Abstract For terahertz (THz) integrated systems, an intersection between waveguides is inevitable and is often accompanied by considerable crosstalk and loss. Here, we propose and experimentally demonstrate a novel type of crossing with a footprint less than 0.2 × 0.2 mm2 for THz surface plasmon polariton waveguiding. With an optimized crossover structure, the measured loss of the intersection is as low as 0.89 dB/crossing, and the crosstalk is less than −19.06 dB/crossing at 0.55 THz. The proposed crossing structure is compact and has low loss and crosstalk within a broad band, which will pave the way for a wide range of new applications for THz integrated systems.

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Compact and multifunctionally integrated systems are an important direction for the development of terahertz (THz) science and technology
The proposed crossing structure is compact and has low loss and crosstalk within a broad band, which will pave the way for a wide range of new applications for THz integrated systems
Spoof surface plasmon polaritons (SPPs) are surface-confined electromagnetic waves supported by periodic metallic structures in the perfect-conductor limit, which resemble the SPPs at a metal-dielectric interface in the optics regime in terms of field confinement and dispersion characteristics [4,5,6]

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Introduction

Compact and multifunctionally integrated systems are an important direction for the development of terahertz (THz) science and technology. Spoof SPPs are surface-confined electromagnetic waves supported by periodic metallic structures in the perfect-conductor limit, which resemble the SPPs at a metal-dielectric interface in the optics regime in terms of field confinement and dispersion characteristics [4,5,6]. This concept opens up an effective way to route SPPs on planar geometries at THz frequencies [6]. The intersecting waveguide is a vital one for highdensity integration [14,15,16,17,18,19]

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