Jun Wu
https://www.spiedigitallibrary.org/journals/Journal-of-Nanophotonics/volume-13/issue-4/046002/Enhancement-of-terahertz-absorption-in-graphene-monolayer-with-Bragg-grating/10.1117/1.JNP.13.4.046002.short?SSO=1
The absorption enhancement in the graphene monolayer for the
terahertz frequency is investigated. This is achieved by placing the graphene
monolayer on a dielectric grating backed with a reduced Bragg grating and a
metallic mirror. Complete absorption is achieved at resonance and the
absorption spectra exhibit an ultranarrow shape, which is attributed to the
combined effects of the guided mode resonance with dielectric grating and the
photonic bandgap with Bragg grating. Moreover, the designed graphene absorber
possesses antenna-like response and thus can be used as a thermal emitter with
high directionality. To disclose the physical origins of such absorption
effects, the electric-field intensity distributions are investigated.
Furthermore, the peak position of the absorption spectra can be tuned by only a
change in the Fermi level. Our results may potentially be used for developing
the next-generation graphene-based optoelectronic devices.
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