High-performance and compact broadband terahertz plasmonic waveguide intersection

• Main Authors: Yuan Mingrui, Li Yanfeng, Lu Yongchang, Zhang Ying, Zhang Ziying, Zhang Xueqian, Zhang Xixiang, Han Jiaguang, Zhang Weili
• Format: Article
• Language: English
• Published: De Gruyter 2019-09-01
• Series: Nanophotonics
• Subjects: terahertz near-field; terahertz spoof surface plasmon polaritions; surface waves; waveguide intersection; crosstalk; 40
• Online Access: https://doi.org/10.1515/nanoph-2019-0191
• ISSN: 2192-8606; 2192-8614

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.