中国物理B ›› 2015, Vol. 24 ›› Issue (10): 104202-104202.doi: 10.1088/1674-1056/24/10/104202

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Superscattering-enhanced narrow band forward scattering antenna

胡德骄a b c, 张志友a b c, 杜惊雷a b c   

  1. a College of Physical Science and Technology, Sichuan University, Chengdu 610064, China;
    b High Energy Density Physics of the Ministry of Education Key Laboratory, Sichuan University, Chengdu 610064, China;
    c Sino-British Joint Materials Research Institute, Sichuan University, Chengdu 610064, China
  • 收稿日期:2014-12-16 修回日期:2015-04-20 出版日期:2015-10-05 发布日期:2015-10-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61377054), the Collaborative Innovation Foundation of Sichuan University, China (Grant No. XTCX 2013002), and the International Cooperation and Exchange of Science and Technology Project in Sichuan Province, China (Grant No. 2013HH0010).

Superscattering-enhanced narrow band forward scattering antenna

Hu De-Jiao (胡德骄)a b c, Zhang Zhi-You (张志友)a b c, Du Jing-Lei (杜惊雷)a b c   

  1. a College of Physical Science and Technology, Sichuan University, Chengdu 610064, China;
    b High Energy Density Physics of the Ministry of Education Key Laboratory, Sichuan University, Chengdu 610064, China;
    c Sino-British Joint Materials Research Institute, Sichuan University, Chengdu 610064, China
  • Received:2014-12-16 Revised:2015-04-20 Online:2015-10-05 Published:2015-10-05
  • Contact: Du Jing-Lei E-mail:dujl@scu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61377054), the Collaborative Innovation Foundation of Sichuan University, China (Grant No. XTCX 2013002), and the International Cooperation and Exchange of Science and Technology Project in Sichuan Province, China (Grant No. 2013HH0010).

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摘要： We present a narrow band forward scattering optical antenna which is based on the excitation of distinctive whispering gallery modes (WGMs). The antenna is composed of three coaxial cylinder layers: a dielectric layer is sandwiched between a metallic core and cladding. Owing to the destructive interference between the scattering of the outer metallic cladding and the WGM in the backward direction, the power flow in the forward direction is increased. Simulation and analysis show that in proper geometry conditions, the cavity can be tuned into a superscattering state. At this state, both the zeroth and the first order of WGM are excited and contribute to the total scattering. It is shown that the power ratio (power towards backward divided by power towards forward ) can be enhanced to about 27 times larger than that for a non-resonant position by the superscattering. Owing to the confinement of the cladding to WGMs, the wavelength range of effective forward scattering is considerably narrow (about 15 nm).

关键词: surface plasmons, optical antenna, directional scattering, Fano resonance

Abstract: We present a narrow band forward scattering optical antenna which is based on the excitation of distinctive whispering gallery modes (WGMs). The antenna is composed of three coaxial cylinder layers: a dielectric layer is sandwiched between a metallic core and cladding. Owing to the destructive interference between the scattering of the outer metallic cladding and the WGM in the backward direction, the power flow in the forward direction is increased. Simulation and analysis show that in proper geometry conditions, the cavity can be tuned into a superscattering state. At this state, both the zeroth and the first order of WGM are excited and contribute to the total scattering. It is shown that the power ratio (power towards backward divided by power towards forward ) can be enhanced to about 27 times larger than that for a non-resonant position by the superscattering. Owing to the confinement of the cladding to WGMs, the wavelength range of effective forward scattering is considerably narrow (about 15 nm).

Key words: surface plasmons, optical antenna, directional scattering, Fano resonance

中图分类号:  (Diffraction and scattering)

  • 42.25.Fx
42.60.Da (Resonators, cavities, amplifiers, arrays, and rings) 73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))