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Tunable infrared Fano resonance from graphene based hybrid grating structure with germanium substrate

  • Regular Article – Optical Phenomena and Photonics
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Abstract

Fano resonance (FR) spectra from graphene based hybrid structure in the infrared region have been obtained and the related mechanisms are demonstrated by simulation method. By changing geometrical parameters, the interaction between graphene surface plasmon polariton (GSPP) and Fabry Perot (FP) mode can be dramatically tuned, resulting in an interesting asymmetric FR spectrum curve. Combing with the electric field distribution at a certain wavelength, the FR spectrum is ascribed to the coupling of the GSPP mode and FP mode. By applying different gate-voltage, the FR spectrum from this hybrid structure exhibits a continuous tunability in the range of 4.5–15.5 um. A high refractive index sensitivity of this hybrid structure working in the mid-infrared is theoretically demonstrated, and the sensitivity of which reaches 1000 nm per refractive index unit. This tunable hybrid structure exhibits great potential application in optoelectronic devices and high performance sensor.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: This is a theoretical study and there is no experimental data available.]

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Acknowledgements

The author would like to show thanks to Professor G. G. Zheng (in Nanjing University of Information Science and Technology) for his valuable discussion.

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Authors and Affiliations

  1. School of Teacher Education, Nanjing University of Information Science and Technology, Nanjing, China

    Kun Zhong

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  1. Kun Zhong
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Contributions

KZ supervised the work and ran all calculations that are reported in the paper. KZ wrote the manuscript and draw the conclusions.

Corresponding author

Correspondence to Kun Zhong.

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Zhong, K. Tunable infrared Fano resonance from graphene based hybrid grating structure with germanium substrate. Eur. Phys. J. D 76, 98 (2022). https://doi.org/10.1140/epjd/s10053-022-00410-w

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