中国物理B ›› 2016, Vol. 25 ›› Issue (10): 108701-108701.doi: 10.1088/1674-1056/25/10/108701

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

Ultra-compact terahertz switch with graphene ring resonators

Jian-Zhong Sun(孙建忠), Le Zhang(章乐), Fei Gao(高飞)   

  1. 1 College of Computer Science & Technology, Zhejiang University of Technology, Hangzhou 310023, China;
    2 Centre for THz Research, China Jiliang University, Hangzhou 310018, China
  • 收稿日期:2016-03-25 修回日期:2016-05-26 出版日期:2016-10-05 发布日期:2016-10-05
  • 通讯作者: Le Zhang E-mail:zhangle85@foxmail.com
  • 基金资助:
    Project supported by the Public Technology Research Project of Zhejiang Province, China (Grant No. 2015C31116).

Ultra-compact terahertz switch with graphene ring resonators

Jian-Zhong Sun(孙建忠)1,2, Le Zhang(章乐)2, Fei Gao(高飞)1   

  1. 1 College of Computer Science & Technology, Zhejiang University of Technology, Hangzhou 310023, China;
    2 Centre for THz Research, China Jiliang University, Hangzhou 310018, China
  • Received:2016-03-25 Revised:2016-05-26 Online:2016-10-05 Published:2016-10-05
  • Contact: Le Zhang E-mail:zhangle85@foxmail.com
  • Supported by:
    Project supported by the Public Technology Research Project of Zhejiang Province, China (Grant No. 2015C31116).

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摘要： We propose and numerically demonstrate a compact terahertz wave switch which is composed of two graphene waveguides and three graphene ring resonators. Changing the bias voltage of the Fermi level in the center graphene ring, the resonant mode can be tuned when the plasmon waves in the waveguides and rings are coupled. We theoretically explain their mechanisms as being due to bias voltage change induced carrier density of graphene modification and the coupling coefficients of graphene plasmon effect after carrier density change, respectively. The mechanism of such a terahertz wave switch is further theoretically analyzed and numerically investigated with the aid of the finite element method. With an appropriate design, the proposed device offers the opportunity to ‘tune’ the terahertz wave ON-OFF with an ultra-fast, high extinction ratio and compact size. This structure has the potential applications in terahertz wave integrated circuits.

关键词: graphene, terahertz wave switch, surface plasmon

Abstract: We propose and numerically demonstrate a compact terahertz wave switch which is composed of two graphene waveguides and three graphene ring resonators. Changing the bias voltage of the Fermi level in the center graphene ring, the resonant mode can be tuned when the plasmon waves in the waveguides and rings are coupled. We theoretically explain their mechanisms as being due to bias voltage change induced carrier density of graphene modification and the coupling coefficients of graphene plasmon effect after carrier density change, respectively. The mechanism of such a terahertz wave switch is further theoretically analyzed and numerically investigated with the aid of the finite element method. With an appropriate design, the proposed device offers the opportunity to ‘tune’ the terahertz wave ON-OFF with an ultra-fast, high extinction ratio and compact size. This structure has the potential applications in terahertz wave integrated circuits.

Key words: graphene, terahertz wave switch, surface plasmon

中图分类号: 

  • 87.50.U-
96.12.kc (Surface materials and properties)