  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.
