Quantum mechanics

Frequency modulation

Amplitude modulation

Materials science

Dirac (video compression format)

Graphene

Nuclear physics

Modulation (music)

Atomic physics

Radio frequency

Telecommunications

Metamaterial

Neutrino

Computer science

Acoustics

Silicon

Fano resonance

Physics

Nanotechnology

Dipole

Terahertz radiation

Semimetal

Resonance (particle physics)

Resonator

Condensed matter physics

Plasmon

Figure of merit

Optoelectronics

Journal of Physics D Applied Physics

The tunable propagation properties of 3D Dirac semimetal (DSM) patterned metamaterial (MM) structures have been symmetrically investigated in the terahertz (THz) regime. The results demonstrate that the resonant properties are very sensitive to the thicknesses of DSM MMs, and hundreds of nanometers are required to excite strong resonant curves. The DSM MMs support both strong LC and dipolar resonances, quite different from graphene MM patterns which mainly depend on dipolar resonance. As the Fermi level increases, the resonant strength becomes stronger, and significant modulation can be achieved, e.g. the amplitude and frequency modulation depths of transmission curves are more than 99% and 80%, respectively. In addition, by utilizing asymmetrical resonators, a very sharp Fano resonant peak is achieved with a large Q -factor of more than 25, for which the figure of merit is about 20. The results are very helpful to understand the tunable mechanisms of DSM devices and design novel THz plasmonic components, such as modulators, filters, and sensors.

Tunable terahertz Dirac semimetal metamaterials