Dispositivos de estruturas planares periódicas baseadas em ressonadores de fosforeno na faixa de infravermelho

Abstract

The anisotropic properties of phosphorene can be exploited for the development of opto3 electronic devices for a wide range of applications. This work presents device modeling consisting of periodic planar structures based on phosphorene in the infrared range. By modeling these structures, we performed studies related to verifying levels of transmittance and resonances. We analyzed the effectiveness of phosphorene resonator geometries and also the control of resonances through electronic doping of the material. The first proposed structure consists of a filter, whose unit cell has a phosphorene layer, in the form of a disk, on a SiO2 dielectric substrate, with operation dependent on the polarization of the wave. The second structure has a unit cell that consists of two phosphorene sheets, also in disk form, coupled in a sandwich configuration to a SiO2 dielectric substrate, with filter operation. The third structure consists of two square phosphorene sheets with different dimensions, also coupled to a SiO2 dielectric substrate, with the function of a dual-band filter. The fourth structure is a filter whose unit cell consists of two identical square phosphorene sheets, in a sandwich configuration with a thin h-BN dielectric sheet. In this filter, the lower square sheet was rotated by 90◦ with respect to the upper one. Such a structure provides a transmission curve with a dipolar resonance frequency, regardless of the polarization of the incident wave. The numerical results are in good agreement with the analytical results obtained by the Temporal Coupled Mode Theory (TCMT). In addition to polarization independence, this device has a low dependence on the angle of incidence of the wave. This fourth structure can be used as a filter, switch, modulator, and sensor. We verified that these four proposed structures, being based on phosphorene, can be dynamically adjusted in frequency ranges greater than those made based on graphene. All results were obtained through electromagnetic simulations using the finite element method.