Tunable multiband terahertz metamaterials using a reconfigurable electric split-ring resonator array

Fusheng Ma; Yu-Sheng Lin; Xinhai Zhang; Chengkuo Lee

doi:10.1038/lsa.2014.52

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Tunable multiband terahertz metamaterials using a reconfigurable electric split-ring resonator array

Original Articles

- Tunable multiband terahertz metamaterials using a reconfigurable electric split-ring resonator array
- Light: Science & Applications Vol. 3, Issue 2, (2014)
- Affiliations：
  
  1.Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore
  2.Institute of Materials Research and Engineering, A*STAR, Singapore 117602, Singapore
- Author bio：
  
  Dr C Lee, Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576, Singapore Email: elelc@nus.edu.sg
- Funds：
- DOI：10.1038/lsa.2014.52
  CLC：
- Published：2014-06，
  
  Published Online：23 May 2014，
  
  Received：29 May 2013，
  
  Revised：16 December 2013，
  
  Accepted：15 February 2014
- Accepted：
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Ma, F. S. et al. Tunable multiband terahertz metamaterials using a reconfigurable electric split-ring resonator array. Light: Science & Applications, 3, e171 (2014).
DOI：

Ma, F. S. et al. Tunable multiband terahertz metamaterials using a reconfigurable electric split-ring resonator array. Light: Science & Applications, 3, e171 (2014). DOI： 10.1038/lsa.2014.52.

摘要

Abstract

We demonstrate micromachined reconfigurable metamaterials working at multiple frequencies simultaneously in the terahertz range. The proposed metamaterial structures can be structurally reconfigured by employing flexible microelectromechanical system-based cantilevers in the resonators

which are designed to deform out of plane under an external stimulus. The proposed metamaterial structures provide not only multiband resonance frequency operation but also polarization-dependent tunability. Three kinds of metamaterials are investigated as electric split-ring resonator (eSRR) arrays with different positions of the split. By moving the position of the split away from the resonator's center

the eSRR exhibits anisotropy

with the dipole resonance splitting into two resonances. The dipole–dipole coupling strength can be continuously adjusted

which enables the electromagnetic response to be tailored by adjusting the direct current (DC) voltage between the released cantilevers and the silicon substrate. The observed tunability of the eSRRs is found to be dependent on the polarization of the incident terahertz wave. This polarization-dependent tunability is demonstrated by both experimental measurements and electromagnetic simulations.

关键词

Keywords

MEMSreconfigurable metamaterialssplit-ring resonatorterahertztunability

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