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Volume 26 - ICOP & ICPET 2020
ICOP & ICPET _ INPC _ ICOFS 2020, 26 - ICOP & ICPET 2020: 1177-1180 |
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Jalalvandi S, Moravvej farshi M K, Darbari S. Effects of Substrate Phonons on the Graphene Plasmonic Absorption. ICOP & ICPET _ INPC _ ICOFS 2020; 26 :1177-1180
URL: http://opsi.ir/article-1-2190-en.html
URL: http://opsi.ir/article-1-2190-en.html
1- Nano-Plasmo Photonics Research Group, Tarbiat Modares University, Tehran.
Abstract: (1664 Views)
We propose a new method to show the effect of the substrate phonons on the plasmonic absorption in graphene nanoribbons. In doing so, first, we have used a random phase approximation method to compare the dielectric functions of the graphene layers patterned on a polar SiO2 and a nonpolar like diamond-like-carbon (DLC) substrates. Then, using the employing dielectric functions together with the integral equation method, we have compared the corresponding plasmonic absorptions in the mid-infrared wavelengths. The comparison has revealed the SiO2 surface phonons strongly interact with the graphene surface plasmons (SPs) at the wavelengths λ =8.56 and 12.4 μm, modifying the related dielectric function and hence the plasmonic absorption significantly, as compared to that of the structured graphene on the nonpolar substrate. This study paves the way for designing graphene based plasmonic devices such as modulators, waveguides, and detectors.
Keywords: Phonon, Graphene, Plasmonic Absorption, Random Phase Approximation, Integral Equation Method.
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