Displacement Current Mediated Resonances in Terahertz Metamaterials

Chao Liu, Kriti Agarwal, Yuping Zhang, Dibakar Roy Chowdhury, Abul K. Azad, Jeong Hyun Cho

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Terahertz metamaterials (THz MMs) have been proven to be good candidates for chemical, biological, temperature, strain, and position sensing. However, currently developed thin-metal-film-based split ring resonator (SRR) MMs have relatively low quality factor (Q-factors), leading to a poor sensitivity, which is one of the obstacles for development of sensors. In order to enhance the Q-factor, novel THz MMs, nanopillar-based MMs, are designed, fabricated, and characterized. The nanopillar-based MMs excite the inductive-capacitive resonance via desplacement currents, showing a significantly enhanced Q-factor around 450, which is about 30 times higher than typical thin-metal-film-based MMs. Nanopillar-based MMs also show 17 times larger frequency shift compared to the metal-film-based MMs when the permittivity of the ambient dielectric properties of the MMs changes. Due to high Q-factor and large frequency shift, the nanopillar-based THz MMs utilizing displacement current have great potential for highly sensitive chemical and biomaterial detection as well as frequency-agile THz devices.

Original languageEnglish (US)
Pages (from-to)1302-1309
Number of pages8
JournalAdvanced Optical Materials
Volume4
Issue number8
DOIs
StatePublished - Aug 1 2016

Bibliographical note

Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • displacement current
  • metamaterials
  • nanopillars
  • quality factor
  • split ring resonators

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