In this work, a broadband absorber is designed for application in the terahertz region using graphene antidots array. The proposed absorber consists of an Au substrate, a polyethylene dielectric layer and a graphene sheet with antidot resonators. The geometrical dimensions of the antidot resonator and its array period, the graphene conductivity parameters and the dielectric layer height and refractive index are the parameters that determine the characteristics of the absorber such as bandwidth, centre frequency, the amount of the absorption and sensitivity to the incident wave incident angle and polarisation. The circuit theory and a broadband matching technique of the transmission lines are utilised in some steps of the design approach. Moreover, some rules of thumb are extracted for the absorber design in different frequencies. The designed absorber has a normalised bandwidth of 80% in the terahertz region, low sensitivity to incident angle and an absorption peak of 100%.

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Utilising graphene antidots for implementation of a broadband terahertz absorber

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