|
Enhanced terahertz absorption in graphene composite integrated with double circular metal ring array Host Publication: The fifth international biennial ‘Nanomaterials and Nanotechnology Meeting’ Authors: G. He and J. Stiens Publication Date: May. 2017
Abstract: Graphene-based terahertz devices, such as modulators, detectors, absorbers, occupy important positions in terahertz application due to graphene’s effectively tunable terahertz absorption. The features of these terahertz devices are greatly related to graphene’s absorption properties of terahertz wave. However, the bare graphene shows limited absorption to terahertz waves. We demonstrate a new graphene composite with a double circular metal ring array deposited on graphene to enhance the absorption. The graphene composite consists of a double circular metal ring array, graphene, silicon dioxide and silicon substrate. The double circular metal ring array locally enhances the electromagnetic field on graphene and further increases graphene’s absorption. It shows that the peak absorption of the proposed graphene composite is increased to 78% when graphene chemical potential is 0.5 eV at room temperature, which is 2.7 times larger than that of the graphene composite without the double circular metal ring array. The enhanced terahertz absorption can improve features of graphene-based terahertz devices.
|
