Electromagnetically Induced Transparency Effect Of Orthogonal Rectangular Cavity MIM Waveguide Numerical Study

Surface plasmon polaritons(SPPs)is a new electromagnetic mode formed by the coupling of incident light waves and collective oscillation of free charges on metal surfaces.It can propagate along metal surfaces or be bound to the surface of nanoparticles.SPPs has one of the most unique and attractive features: it can break through the optical diffraction effect.In other words,we can make traditional optical devices nano-sized without worrying about optical diffraction effects.The Metal-Insulator-Metal(MIM)plasma waveguide structure is capable of transmitting surface plasmons,and has attracted more and more attention due to its simple structure,easy fabrication,long transmission distance,and strong binding to SPPs.In this paper,the numerical simulation of plasma-induced transparency effect is realized by introducing orthogonal rectangular cavity structures on one or both sides of the MIM waveguide structure.The simulation results show that in the MIM waveguide structure with one-side T-shaped or inverted T-shaped cavity,when the orthogonal rectangular cavity is a symmetrical T-shaped or inverted T-shaped structure,the transmission forbidden band will appear when the orthogonal rectangular cavity is non-When the symmetrical structure and the length and width of the cavity satisfy certain conditions,plasma-induced transparency occurs at the original transmission band gap.At this time,along with the plasma-induced transparency effect,there is also a slow light effect.The maximum optical delay of the MIM waveguide structure with T-shaped and inverted T-shaped resonators is calculated to be 0.086 ps and 0.052 ps,respectively.In the MIM waveguide structure with a double-sided L-shaped cavity,the plasma-induced transparency occurs between the transmission zeros of the individual L-shaped resonators due to the coupling effect of the upper and lower resonators,and the incident wavelength corresponding to the transmission peak is the intermediate value of the two transmission zeros,it is found that the maximum optical delay of the MIM waveguide with double-sided L-shaped cavity can reach 4.35 ps,which has better optical delay characteristics than a T-shaped cavity MIM waveguide structure.The results show that the MIM waveguide structure with orthogonal rectangular cavity can control the light propagation at the nanoscale,which provides a theoretical reference for the integration of plasma nanodevices.