Ultra-sensitive graphene based mid-infrared plasmonic bio-chemical sensing using dielectric beads as a medium

Xiao Liu, Duan Zhang*, Ye Cun Wu, Mei Yang, Qian Wang, Cormac Coileáin, Hongjun Xu, Chen Yang, Mohamed Abid, Mourad Abid, Huajun Liu, Byong Sun Chun, Qingfan Shi, Han Chun Wu

*Corresponding author for this work

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Abstract

Graphene is moving beyond the realm of simple electronic devices toward areas such as advanced bio-chemical sensing. The infrared (IR) response of graphene, characterized by collective long-lived charge-carrier oscillations, could be applied in IR-absorption spectroscopy, typically used for bio-chemical analysis. However, direct light absorption by propagating plasmons in graphene is forbidden due to the large momentum mismatch. Proposed methods to overcome this bottleneck come at a cost, the use of noble metal particles on graphene reduces the spectral bandwidth and nano-structuring graphene is expensive. Here, we propose a simple and cheap method to fabricate large scale ultra-sensitive graphene based mid-IR biosensors, by introducing dielectric beads to excite mid-IR range plasmons. Interference from waves scattered by the beads excite surface plasmon polaritons, which propagate several micrometers in graphene and enhance the interaction between the molecules and mid-IR light. This method opens an interesting window for the application of graphene in bio-chemical sensing.

Original languageEnglish
Pages (from-to)404-410
Number of pages7
JournalCarbon
Volume122
DOIs
Publication statusPublished - Oct 2017

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Liu, X., Zhang, D., Wu, Y. C., Yang, M., Wang, Q., Coileáin, C., Xu, H., Yang, C., Abid, M., Abid, M., Liu, H., Chun, B. S., Shi, Q., & Wu, H. C. (2017). Ultra-sensitive graphene based mid-infrared plasmonic bio-chemical sensing using dielectric beads as a medium. Carbon, 122, 404-410. https://doi.org/10.1016/j.carbon.2017.06.089