Plasmons and terahertz devices in graphene

Abstract

We introduce a novel scheme for efficient manipulation and detection of terahertz (THz) radiation. Our work consists of two parts; with a focus on proving the concept of our novel scheme, and the exploitation of graphene's peculiar properties. For the first part, we report on the successful demonstration of two multiresonance Split Ring Resonator (SRR) designs, for efficient modulation of THz frequency beams. The two designs are based on SRR intracoupling, with multiple predefined resonances covering the bandwidth 40-300 GHz. The simulation results obtained have been experimentally verified. The second part of the work reports on the computational development of novel architectures of low-impedance broadband antennas, for efficient detection of THz frequency beams. The conceived Split Ring Resonator-Resonance Assisted (SRR-RA) antennas are based on both a capacitive and inductive scheme, exploiting a 200 $\Omega$ and 400 $\Omega$ impedance, respectively. Moreover, the impedance is tunable by varying the geometry's coupling parameters, allowing for better matching with the detector circuit for maximum power extraction. Our results have been obtained at simulation level for a 1.5 THz operation frequency.