journal article·2020-12-16

Gradient Index Devices for Terahertz Spoof Surface Plasmon Polaritons

Xiaoqiang Su, Quan Xu, Yongchang Lu, Ziying Zhang, Yuehong Xu, Xueqian Zhang, Yanfeng Li, Chunmei Ouyang, Fusheng Deng, Yanhong Liu, Lijuan Dong, Yunlong Shi, Xixiang Zhang, Jiaguang Han, Weili Zhang

ACS Photonics· Volume 7· Issue 12
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Abstract

Terahertz electromagnetic fields can be well confined and propagate at structured metal surfaces, known as spoof surface plasmon polaritons (SSPPs). Recent demonstrations of terahertz SSPP waveguides have attracted much attention for their potential in developing ultracompact plasmonic circuits. However, further progress has been hampered by the lack of complex and high-performance devices that can flexibly manipulate the propagation of terahertz SSPPs. Here, we demonstrate several terahertz gradient index SSPP devices using metallic pillar structures. The devices are realized by engineering the geometric parameters of each metallic pillar to achieve the desired local mode index for the terahertz SSPPs. The performance of these SSPP devices is experimentally characterized using scanning near-field terahertz microscopy. The versatility of the presented design scheme would provide a platform for the design and fabrication of high-performance plasmonic devices, especially cascadable ones in practical applications.
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Research context

OpenAlex topics: Plasmonic and Surface Plasmon Research · Photonic and Optical Devices · Metamaterials and Metasurfaces Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Institute of Solid State Physics and College of Physics and Electronic Science, Shanxi Province Key Laboratory of Microstructure Electromagnetic Functional Materials, Shanxi Datong University, Datong 037009, China

Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technology (Ministry of Education of China), Tianjin University, Tianjin 300072, China

Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia

School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States

Funding

China Postdoctoral Science Foundation · King Abdullah University of Science and Technology · National Natural Science Foundation of China · Datong City · Shanxi Province · Tianjin Municipality

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