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Microelectromechanically tunable multiband metamaterial with preserved isotropy.

Prakash Pitchappa1, Chong Pei Ho1, You Qian2

  • 11] Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 [2] Center for Intelligent Sensors and MEMS, National University of Singapore, 4 Engineering Drive 3, Singapore 117576 [3] Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), 11 Science Park Road, Singapore Science Park II, Singapore 117685. [4] NUS Suzhou Research Institute (NUSRI), Suzhou Industrial Park, Suzhou, P. R. China 215123.

Scientific Reports
|June 27, 2015
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Summary
This summary is machine-generated.

We developed a reconfigurable metamaterial for terahertz frequencies that is polarization independent. This novel device enables tunable dual-band responses, advancing terahertz imaging and communication.

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Area of Science:

  • Metamaterials
  • Terahertz Science
  • Microelectromechanical Systems (MEMS)

Background:

  • Terahertz (THz) technology requires advanced materials for diverse applications.
  • Developing polarization-independent metamaterials is crucial for robust THz device performance.
  • Reconfigurable metamaterials offer dynamic control over electromagnetic responses.

Purpose of the Study:

  • To experimentally demonstrate a micromachined reconfigurable metamaterial.
  • To achieve polarization-independent multiple resonances in the terahertz spectral region.
  • To enable tunable dual-band isotropic responses for advanced THz applications.

Main Methods:

  • Fabrication of a metamaterial unit cell with eight out-of-plane deformable microcantilevers.
  • Utilizing an octagon ring geometry for rotational symmetry.
  • Actuating microcantilevers to alter metamaterial configurations and measure responses.

Main Results:

  • Demonstrated polarization-independent response for electrical inductive-capacitive (eLC) and dipolar resonances.
  • Achieved switching ranges of 0.16 THz and 0.37 THz for the resonances.
  • Observed transmission intensity changes exceeding 0.2 and 0.7, with up to 80% modulation after optimization.

Conclusions:

  • The proposed metamaterial offers simultaneously tunable dual-band isotropic characteristics.
  • This technology facilitates high-performance electro-optic devices for THz imaging, spectroscopy, and communication.
  • The reconfigurable metamaterial paves the way for next-generation THz applications.