Abstract

Graphene plasmons confined in gate-defined Fabry–Perot cavities can be tuned into resonant operation for terahertz detection. This work combines gate-dependent on-chip terahertz photocurrent spectroscopy with a perpendicular magnetic field to probe resonant magnetoplasmons in antenna-coupled monolayer and bilayer graphene TeraFETs. The monolayer devices show a non-monotonic density dependence reflecting Dirac-carrier physics, while the bilayer devices exhibit a dispersion consistent with a conventional Schrödinger-type picture. The results establish graphene TeraFETs as a platform for magnetically programmable, frequency-selective terahertz photonics.

Abstract

Graphene plasmons confined in gate-defined Fabry–Perot cavities can be tuned into resonant operation for terahertz detection. This work combines gate-dependent on-chip terahertz photocurrent spectroscopy with a perpendicular magnetic field to probe resonant magnetoplasmons in antenna-coupled monolayer and bilayer graphene TeraFETs. The monolayer devices show a non-monotonic density dependence reflecting Dirac-carrier physics, while the bilayer devices exhibit a dispersion consistent with a conventional Schrödinger-type picture. The results establish graphene TeraFETs as a platform for magnetically programmable, frequency-selective terahertz photonics.

Abstract

Graphene plasmons confined in gate-defined Fabry–Perot cavities can be tuned into resonant operation for terahertz detection. This work combines gate-dependent on-chip terahertz photocurrent spectroscopy with a perpendicular magnetic field to probe resonant magnetoplasmons in antenna-coupled monolayer and bilayer graphene TeraFETs. The monolayer devices show a non-monotonic density dependence reflecting Dirac-carrier physics, while the bilayer devices exhibit a dispersion consistent with a conventional Schrödinger-type picture. The results establish graphene TeraFETs as a platform for magnetically programmable, frequency-selective terahertz photonics.

Abstract

Graphene plasmons confined in gate-defined Fabry–Perot cavities can be tuned into resonant operation for terahertz detection. This work combines gate-dependent on-chip terahertz photocurrent spectroscopy with a perpendicular magnetic field to probe resonant magnetoplasmons in antenna-coupled monolayer and bilayer graphene TeraFETs. The monolayer devices show a non-monotonic density dependence reflecting Dirac-carrier physics, while the bilayer devices exhibit a dispersion consistent with a conventional Schrödinger-type picture. The results establish graphene TeraFETs as a platform for magnetically programmable, frequency-selective terahertz photonics.