Abstract
Propagation characteristics of symmetrical and asymmetrical multilayer hybrid insulator-metal-insulator (HIMI) and metal-insulator-metal (HMIM) plasmonic slab waveguides are investigated using the transfer matrix method. Propagation length (Lp) and spatial length (Ls) are used as two figures of merit to qualitate the plasmonic waveguides. Symmetrical structures are shown to be more performant (having higher Lp and lower Ls), nevertheless it is shown that usage of asymmetrical geometry could compensate for the performance degradation in practically realized HIMI waveguides with different substrate materials. It is found that HMIM slab waveguide could support almost long-range subdiffraction plasmonic modes at dimensions lower than the spatial length of the HIMI slab waveguide.
Highlights
Plasmonic nanostructures has been considered extensively in recent years as a platform to guide and manipulate plasmonic waves (Surface Plasmon-Polariton (SPP)) at dimensions lower than the diffraction limit
Silica is used for the L and S-layers and silicon is used for the H-layer dielectric material with constants of 2.1 and 12.1, respectively
This could be described by the fact that, the hybrid insulator-metal-insulator (HIMI) slab waveguide is formed by the coupling of two HMI slab waveguides which results in modes that are complete supermodes (without cut-off thickness (Fig. 2(a)))
Summary
Plasmonic nanostructures has been considered extensively in recent years as a platform to guide and manipulate plasmonic waves (Surface Plasmon-Polariton (SPP)) at dimensions lower than the diffraction limit. Many designs are proposed to make a balance between confinement and loss based on three primary structures of metal–insulator (MI), insulator–metal–insulator (IMI) and metal–insulator–metal (MIM) [1,2,3,4,5,6,7,8], among which “Hybrid structures” are supposed to be a very promising choice [9]. H a TM0a , dL=2 nm TM0a , dL=25 nm TM0a , dL=100 nm TM1s , dL=2 nm TM1s , dL=25 nm TM1s , dL=100 nm Propagation Length [ μm]
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