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Dual band enhanced transmission through a subwavelength aperture based on two split-ring-resonators

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Abstract

Enhanced transmission through a subwavelength aperture is observed at two frequency bands with employment of two split-ring-resonators (SRR) of different sizes. Each of the SRR is excited to produce resonance and the electric field energy localized in its gap and split region can be coupled into a small hole with a radius of 2.3 mm around the respective resonance frequency. The simulation results show that the energy through the small hole is increased at 5.94 GHz (r/λ 1=0.045) and 7.03 GHz (r/λ 2=0.054), where 1042-fold and 88-fold enhancements are obtained, respectively, in comparison with the case of a single isolated hole. Moreover, it is found that placing two identical SRR structures in front of the hole can realize higher enhanced transmission with respect to the case of only one SRR utilized. The electric field coupling-enhancement mechanism is well described by studying the electric field distribution.

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Authors and Affiliations

  1. State Key Laboratory of Optical Technologies for Microfabrication, Institute of Optics and Electronics, Chinese Academy of Sciences, P.O. Box 350, Chengdu, 610209, China

    C. Huang, Z. Zhao, Q. Feng & X. Luo

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  1. C. Huang
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  2. Z. Zhao
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  3. Q. Feng
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  4. X. Luo
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Correspondence to X. Luo.

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Huang, C., Zhao, Z., Feng, Q. et al. Dual band enhanced transmission through a subwavelength aperture based on two split-ring-resonators. Appl. Phys. B 101, 297–303 (2010). https://doi.org/10.1007/s00340-010-4163-y

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  • DOI: https://doi.org/10.1007/s00340-010-4163-y

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