Reconfigurable multi-band, graphene-based THz absorber: Circuit model approach

Tunable Wideband Graphene based Filters in THz Band

In this paper, a procedure for analyzing and designing of tunable wideband band-pass and band-stop graphene based filters in the terahertz band is proposed. These planar wideband plasmonic filters are unique in their kind. With this procedure, it is possible to design filters with the desired functional characteristics in the form of the similar quarter-wavelength resonance stubs. The discontin...

Functional multi-band THz meta-foils

In this paper, we present the first experimental demonstration of double- and triple-band negative refraction index meta-foils in the terahertz (THz) region. Multi-band meta-foils constructed by multi-cell S-string resonators in a single structure exhibit simultaneously negative permittivity and negative permeability responses at multiple frequencies. The phenomena are confirmed by numerical si...

Independently tunable dual-band perfect absorber based on graphene at mid-infrared frequencies

We design a dual-band absorber formed by combining two cross-shaped metallic resonators of different sizes within a super-unit-cell arranged in mirror symmetry. Simulations indicate that absorption efficiencies greater than 99% can be achieved at two different frequencies under normal incidence. We employ a design scheme with graphene integration, which allows independent tuning of individual a...

Ultrafast graphene-based broadband THz detector

Reconfigurable Multi-Band Quadrature ΣΔ Modulators

A new design methodology for reconfigurable quadrature band-pass ΣΔ modulator is proposed. The methodology uses architectures, which locks various range of IF frequencies to the sampling frequency for lower order quadrature modulators. A gereralized integrator based architecture is developed from the delay architectures. The method is presented with derivation of the base circuitry and with thi...