Tunable plasmon induced transparency in a graphene-based waveguide structure and it’s applications in sensing

Xu Han; Tao Wang

doi:10.1117/12.2271124

24 August 2017 Tunable plasmon induced transparency in a graphene-based waveguide structure and it’s applications in sensing

Xu Han, Tao Wang

Author Affiliations +

Proceedings Volume 10343, Metamaterials, Metadevices, and Metasystems 2017; 103432H (2017) https://doi.org/10.1117/12.2271124
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

Abstract

In this paper, we propose dynamically tunable plasmon induced transparency (PIT) in a graphene-based nanoribbon waveguide structure by changing the chemical potential of graphene. It is the direct destructive interference between the propagating plasmonic edge mode in the graphene nanoribbon waveguide and the rectangular resonators gives rise to the PIT effect. Our numerical results reveal that high tunability in the PIT transparency window can be obtained by altering the chemical potential of the graphene rectangular resonators. Moreover, a novel plasmonic refractive index sensor (RIS) has been proposed and investigated numerically based on the PIT effect in the mid-IR range. Our calculated results exhibit that large wavelength sensitivity as high as 2500 nm/RIU and a high figure of merit (FOM) of 10.50 can be achieved in this ultra-compact structure (<0.05 μm² ). This work not only paves a new way towards the realization of graphene-based integrated nanophotonic devices, but also has important applications in multi-channel-selective filters, sensors, and slow light.

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Xu Han and Tao Wang "Tunable plasmon induced transparency in a graphene-based waveguide structure and it’s applications in sensing", Proc. SPIE 10343, Metamaterials, Metadevices, and Metasystems 2017, 103432H (24 August 2017); https://doi.org/10.1117/12.2271124

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KEYWORDS

Sensors

Waveguides

Graphene

Plasmonics

Transparency

Plasmons

Slow light

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