中国物理B ›› 2023, Vol. 32 ›› Issue (10): 104202-104202.doi: 10.1088/1674-1056/accd5a

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Active control of surface plasmon polaritons with phase change materials

Yuan-Zhen Qi(漆元臻), Qiao Jiang(蒋瞧), Hong Xiang(向红), and De-Zhuan Han(韩德专)   

  1. Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China
  • 收稿日期:2023-03-24 修回日期:2023-04-11 接受日期:2023-04-17 出版日期:2023-09-21 发布日期:2023-09-22
  • 通讯作者: Hong Xiang, De-Zhuan Han E-mail:xhong@cqu.edu.cn;dzhan@cqu.edu.cn

Active control of surface plasmon polaritons with phase change materials

Yuan-Zhen Qi(漆元臻), Qiao Jiang(蒋瞧), Hong Xiang(向红), and De-Zhuan Han(韩德专)   

  1. Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, China
  • Received:2023-03-24 Revised:2023-04-11 Accepted:2023-04-17 Online:2023-09-21 Published:2023-09-22
  • Contact: Hong Xiang, De-Zhuan Han E-mail:xhong@cqu.edu.cn;dzhan@cqu.edu.cn

摘要: Active control of surface plasmon polaritons (SPPs) is highly desired for nanophotonics. Here we employ a phase change material Ge2Sb2Te5 (GST) to actively manipulate the propagating direction of SPPs at the telecom wavelength. By utilizing the phase transition-induced refractive index change of GST, coupled with interference effects, a nanoantenna pair containing GST is designed to realize switchable one-way launching of SPPs. Devices based on the nanoantenna pairs are proposed to manipulate SPPs, including the direction tuning of SPP beams, switchable SPP focusing, and switchable cosine-Gauss SPP beam generating. Our design can be employed in compact optical circuits and photonics integration.

关键词: surface plasmon polaritons, phase change materials, direction control, non-diffractive

Abstract: Active control of surface plasmon polaritons (SPPs) is highly desired for nanophotonics. Here we employ a phase change material Ge2Sb2Te5 (GST) to actively manipulate the propagating direction of SPPs at the telecom wavelength. By utilizing the phase transition-induced refractive index change of GST, coupled with interference effects, a nanoantenna pair containing GST is designed to realize switchable one-way launching of SPPs. Devices based on the nanoantenna pairs are proposed to manipulate SPPs, including the direction tuning of SPP beams, switchable SPP focusing, and switchable cosine-Gauss SPP beam generating. Our design can be employed in compact optical circuits and photonics integration.

Key words: surface plasmon polaritons, phase change materials, direction control, non-diffractive

中图分类号:  (Interference)

  • 42.25.Hz
73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)) 73.40.Rw (Metal-insulator-metal structures)