Abstract
Reconfigurable and scalable plasmonics demultiplexers have attracted increasing attention due to its potential applications in the nanophotonics. Therefore, here, a novel method to design compact plasmonic wavelength demultiplexers (DEMUXes) is proposed. The designed structures (two, four, and six-channel DEMUXes) consist of symmetrical rectangular resonators (RRs) incorporating metal nano-rod defects (NRDs). In the designed structures, the RRs are laterally coupled to metal–insulator-metal (MIM) waveguides. The wavelengths of the output channels depend on the numbers and radii of the metal NRDs in the RRs. The results obtained from various device geometries, with either a single or multiple output ports, are performed utilizing a single structure, showing real reconfigurability. The finite-difference time-domain (FDTD) method is used for the numerical investigation of the proposed structures. The metal and insulator used for the realization of the proposed DEMUXes are silver and air, respectively. The silver’s permittivity is characterized by the well-known Drude model. The basic plasmonic filter which is used to design plasmonic DEMUXes is a single-mode filter. A single-mode filter is easier to cope with in circuits with higher complexity such as DEMUXes. Also, different structural parameters of the basic filter are swept and their effects on the filter’s frequency response are presented, to provide a better physical insight. Taking into account the compact sizes of the proposed DEMUXes (considering the six-channel DEMUX), they can be used in integrated optical circuits for optical communication purposes.
Highlights
Surface plasmon polaritons (SPPs) are the electromagnetic waves that confine at the boundary of two metal and insulator materials with different signs of dielectric constants[1,2,3]
It is worth mentioning that there are other topologies such as plasmonic DEMUXes based on rectangular resonators (RRs)[35,36], H-shaped resonators[37], directional coupler structures[38], and so on
The designed structures are composed of symmetrical RRs containing silver nano-rod defects (NRDs) and MIM waveguides
Summary
Surface plasmon polaritons (SPPs) are the electromagnetic waves that confine at the boundary of two metal and insulator materials with different signs of dielectric constants[1,2,3]. For shifting the resonance wavelength of the designed basic filter without needing to increase the resonator size, the proposed method in40 has been used. To study the effect of the nano-rods structural parameters on the transmission spectrum of the basic filter containing the NRDs, the parameters’ values of r (radius of the silver nano-rods) and N (number of the defects) have been swept.
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