中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4287-4291.doi: 10.1088/1674-1056/18/10/032

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Investigation of transmission resonances on the one-dimensional metallic cylindrical gratings in THz frequency range

孙毅民1, 汪力1, 陈华2   

  1. (1)Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China; (2)Department of Physics, Southeast University, Nanjing 211189, China
  • 收稿日期:2009-02-11 修回日期:2009-03-11 出版日期:2009-10-20 发布日期:2009-10-20

Investigation of transmission resonances on the one-dimensional metallic cylindrical gratings in THz frequency range

Chen Hua(陈华)a)†, Sun Yi-Min(孙毅民)b), and Wang Li(汪力)b)   

  1. a Department of Physics, Southeast University, Nanjing 211189, China; b Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100190, China
  • Received:2009-02-11 Revised:2009-03-11 Online:2009-10-20 Published:2009-10-20

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摘要： In the experiments of THz wave transmitting through the metallic cylindrical gratings fabricated by sub-wavelength brass wires, this paper reports that the discrepancy in the sharp resonances occurred as the grating perpendicular or parallel to the electric vector are observed. A simulation based on the finite difference time domain (FDTD) indicated that the enhanced transmission through the grating is attributed to the combined effects of surface plasmons and cavity modes in the perpendicular condition, while the cavity modes dominate the resonant transmission under the other conditions. Additional experimental data and calculated results show that ～1 enhanced coupling efficiency can be realized in some THz frequency, which could be applied to the design and improvement of various optoelectronic devices, or detection of biological molecule and powder samples, etc.

Abstract: In the experiments of THz wave transmitting through the metallic cylindrical gratings fabricated by sub-wavelength brass wires, this paper reports that the discrepancy in the sharp resonances occurred as the grating perpendicular or parallel to the electric vector are observed. A simulation based on the finite difference time domain (FDTD) indicated that the enhanced transmission through the grating is attributed to the combined effects of surface plasmons and cavity modes in the perpendicular condition, while the cavity modes dominate the resonant transmission under the other conditions. Additional experimental data and calculated results show that ～1 enhanced coupling efficiency can be realized in some THz frequency, which could be applied to the design and improvement of various optoelectronic devices, or detection of biological molecule and powder samples, etc.

Key words: THz wave transmitting, gratings, surface plasmons, cavity modes

中图分类号:  (Gratings)

  • 42.79.Dj
02.70.Bf (Finite-difference methods) 07.57.Kp (Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors) 73.20.Mf (Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)) 78.70.Gq (Microwave and radio-frequency interactions)