中国物理B ›› 2022, Vol. 31 ›› Issue (1): 14216-014216.doi: 10.1088/1674-1056/ac0e28

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Mode splitting and multiple-wavelength managements of surface plasmon polaritons in coupled cavities

Ping-Bo Fu(符平波) and Yue-Gang Chen(陈跃刚)   

  1. School of Physics, Guizhou University, Guiyang 550025, China
  • 收稿日期:2021-04-06 修回日期:2021-06-15 接受日期:2021-06-24 出版日期:2021-12-03 发布日期:2021-12-28
  • 通讯作者: Yue-Gang Chen E-mail:yg_chenyg@sina.com
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11764006).

Mode splitting and multiple-wavelength managements of surface plasmon polaritons in coupled cavities

Ping-Bo Fu(符平波) and Yue-Gang Chen(陈跃刚)   

  1. School of Physics, Guizhou University, Guiyang 550025, China
  • Received:2021-04-06 Revised:2021-06-15 Accepted:2021-06-24 Online:2021-12-03 Published:2021-12-28
  • Contact: Yue-Gang Chen E-mail:yg_chenyg@sina.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11764006).

摘要: Resonance cavity is a basic element in optics, which has wide applications in optical devices. Coupled cavities (CCs) designed in metal-insulator-metal (MIM) bus waveguide are investigated through the finite difference time domain method and coupled-mode theory. In the CCs, the resonant modes of the surface plasmon polaritons (SPPs) split with the thickness decreasing of the middle baffle. Through the coupled-mode theory analysis, it is found that the phase differences introduced in opposite and positive couplings between two cavities lead to mode splitting. The resonant wavelength of positive coupling mode can be tuned in a large range (about 644 nm) through adjusting the coupling strength, which is quite different from the classical adjustment of the optical path in a single cavity. Based on the resonances of the CCs in the MIM waveguide, more compact devices can be designed to manipulate SPPs propagation. A device is designed to realize flexible multiple-wavelength SPPs routing. The coupling in CC structures can be applied to the design of easy-integrated laser cavities, filters, multiple-wavelength management devices in SPPs circuits, nanosensors, etc.

关键词: surface plasmon polaritons, coupled resonators, multiplexing

Abstract: Resonance cavity is a basic element in optics, which has wide applications in optical devices. Coupled cavities (CCs) designed in metal-insulator-metal (MIM) bus waveguide are investigated through the finite difference time domain method and coupled-mode theory. In the CCs, the resonant modes of the surface plasmon polaritons (SPPs) split with the thickness decreasing of the middle baffle. Through the coupled-mode theory analysis, it is found that the phase differences introduced in opposite and positive couplings between two cavities lead to mode splitting. The resonant wavelength of positive coupling mode can be tuned in a large range (about 644 nm) through adjusting the coupling strength, which is quite different from the classical adjustment of the optical path in a single cavity. Based on the resonances of the CCs in the MIM waveguide, more compact devices can be designed to manipulate SPPs propagation. A device is designed to realize flexible multiple-wavelength SPPs routing. The coupling in CC structures can be applied to the design of easy-integrated laser cavities, filters, multiple-wavelength management devices in SPPs circuits, nanosensors, etc.

Key words: surface plasmon polaritons, coupled resonators, multiplexing

中图分类号:  (Integrated optics)

  • 42.82.-m
42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 42.79.Sz (Optical communication systems, multiplexers, and demultiplexers?) 42.79.-e (Optical elements, devices, and systems)