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Research Articles

A polarization-independent terahertz plasmon-induced transparency metamaterial based on hybrid graphene-gold structure for bio-sensing

, , , &
Pages 200-206 | Received 26 Feb 2015, Accepted 07 Jul 2015, Published online: 06 Aug 2015
 

Abstract

A polarization-independent terahertz metamaterial based on hybrid graphene-gold structure with excellent refractive index sensing characteristics is proposed. The proposed structure exhibits a sharply narrow plasmon-induced transparency peak in the transmission spectrum at the terahertz regime. Obvious frequency shift in the transparency peak can be observed by varying the surrounding medium’s refractive index or the Fermi level in graphene, which can be well applied in bio-sensing technology. Moreover, an electrical RLC circuit model is used to provide a reasonable explanation for the optical response process in the proposed structure. Our work can offer reference value for the application of graphene technology as well as new idea for designing novel biosensors.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the National Basic Research Program of China (973) [grant number 2014CB339802], [grant number 2015CB755403]; the National Natural Science Foundation of China [grant number 61271066].

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