Temperature-dependent effect of modulation in graphene-supported metamaterials

We report on a novel effect of temperature-dependent modulation in graphene-supported metamaterials. The effect was observed during the theoretical analysis of a model graphene-supported electro-optical modulator having silicon dioxide (SiO 2 ) or hafnium dioxide (HfO 2 ) as a buffer dielectric laye...

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Bibliographic Details
Published in:New journal of physics 2022-04, Vol.24 (4), p.43006
Main Authors: Morozov, Yevhenii M, Lapchuk, Anatoliy S, Protsak, Iryna S, Kryuchyn, Andriy A, Nevirkovets, Ivan P
Format: Article
Language:English
Subjects:
Buffer layers
Chemical potential
electro-optical modulators/switchers
Graphene
Hafnium oxide
Metamaterials
Modulation
modulation depth
Physics
Silicon dioxide
Temperature dependence
Temperature effects
theoretical analysis
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Summary:We report on a novel effect of temperature-dependent modulation in graphene-supported metamaterials. The effect was observed during the theoretical analysis of a model graphene-supported electro-optical modulator having silicon dioxide (SiO 2 ) or hafnium dioxide (HfO 2 ) as a buffer dielectric layer. Comparative analysis of the two materials showed that they provide approximately the same maximum values for transmission and reflection modulation depths. However, in the case of a HfO 2 buffer layer, a lower chemical potential of the graphene is required to achieve the maximum value. Moreover, theoretical calculations revealed that a lower gate voltage (up to 6.4 times) is required to be applied in the case of a HfO 2 layer to achieve the same graphene chemical potential. The graphene layer was found to possesses high absorption (due to the additional resonance excitation) for some values of chemical potential and this effect is extremely temperature dependent. The discovered modulation effect was demonstrated to further increase the transmission modulation depth for the simple model structure up to 2.7 times (from 18.4% to 50.1%), while for the reflection modulation depth, this enhancement was equal to 2.2 times (from 24.4% to 52.8%). The novel modulation effect could easily be adopted and applied over a wide range of metadevices which would serve as a quick booster for the development of related research areas.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ac5dfa