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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Subcell misalignment in vertically cascaded metamaterial absorbers.

Qin Chen1, Fuhe Sun, Shichao Song

  • 1Key Laboratory of Nanodevices and Applications, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 398 Ruoshui Road, Suzhou 215123, China. qchen2012@sinano.ac.cn

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Lateral misalignments in vertically cascaded metamaterial absorbers significantly impact spectral response. Even small position deviations, like λ/10, drastically reduce near-unity absorbance, highlighting critical lithography registration needs.

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Area of Science:

  • Metamaterial science
  • Electromagnetic (EM) properties
  • Nanofabrication

Background:

  • Metamaterials exhibit unique EM properties, enabling applications like perfect absorbers.
  • Cascaded metamaterial absorbers offer enhanced spectral engineering capabilities.
  • Previous research often assumed perfect alignment of subcells in cascaded structures.

Purpose of the Study:

  • To numerically investigate the impact of lateral misalignments in vertically cascaded metamaterial absorbers.
  • To analyze how position deviations of subcells affect the spectral response.
  • To determine the required registration accuracy for multi-step lithography of cascaded metamaterials.

Main Methods:

  • Numerical simulation of vertically cascaded metamaterial absorbers.
  • Analysis of spectral response under varying lateral subcell misalignments.
  • Investigation of electromagnetic field and induced current distributions.

Main Results:

  • Lateral misalignments significantly alter the spectral response of cascaded metamaterial absorbers.
  • A subcell misalignment of λ/10 reduced absorbance from near-unity to 30%.
  • Detailed analysis revealed that relative position variations in strongly coupled subcells cause this sensitivity.

Conclusions:

  • Subcell position accuracy is critical for achieving desired spectral responses in cascaded metamaterial absorbers.
  • The study provides essential guidelines for lithography registration in fabricating such devices.
  • The observed high position sensitivity suggests potential applications leveraging this phenomenon.