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Abstract
We numerically investigate a novel and competitive graphene-based Fabry–Perot (GFP) structure to enhance the light–matter interaction of graphene at telecommunication wavelengths, and highly efficient narrow-band absorption is achieved. The absorptance of the GFP structure can reach near-unity by optimizing the position of graphene in the dielectric layer, and the localized absorptance of graphene at telecommunication wavelengths can be improved from 2.3% to 83.2%, which is attributed to the strong field confinement of Fabry–Perot resonance in the dielectric layer. The remarkable enhancement of graphene absorption can be acquired for both TM and TE polarizations. Such a graphene-based structure enables a tunable operating wavelength by adjusting geometrical parameters to realize the spectral selectivity of the system in the near-infrared range. Furthermore, the optimized GFP structure possesses excellent spectral selectivity with the full width at half-maximum of 33 nm. The meaningful improvement and tunability of graphene absorption can provide a promising prospect for the realization of high-performance graphene-based optoelectronic devices.
© 2019 Optical Society of America
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