A silicon-based hybrid plasmonic waveguide with a metal cap for a nano-scale light confinement

Abstract

A hybrid plasmonic waveguide with a metal cap on a silicon-on-insulator rib (or slab) is presented. There is a low-index material nano-layer between the Si layer and the metal layer. The field enhancement in the nano-layer provides a nano-scale confinement of the optical field (e.g., 50 nm x 5 nm) when operates at the optical wavelength lambda = 1550 nm. The theoretical investigation also shows that the present hybrid plasmonic waveguide has a low loss and consequently a relatively long propagation distance (on the order of several tens of lambda).

Highly Directive Hybrid Plasmonic Leaky Wave Optical Nano-Antenna

“…These structures are developed by implementing a material with low refractive index (SiO 2 ), between a metal (Ag), and another material with higher refractive index (Si). This structure supports a guided plasmonic TM mode, with high confinement inside the material with lower refractive index [22][23][24][25][26]. When the guided hybrid plasmonic mode enters to the antenna, it transforms to a radiating mode due to the periodic slots provided in the design (See Fig.…”

“…1. As shown in this figure, the antenna is designed based on the hybrid plasmonic structure [22][23][24][25][26]. These structures are developed by implementing a material with low refractive index (SiO 2 ), between a metal (Ag), and another material with higher refractive index (Si).…”

Compact low loss and broadband hybrid plasmonic directional coupler

“…The proposed guide offers a number of advantages: it is very compact and provides a better compromise between loss and confinement compared to purely plasmonic guides. Since our first proposal, many different HPWG structures have been analyzed [12,13] and many applications of the HPWG have been suggested [14][15][16][17][18]. These devices can outperform previously reported SOI based devices.…”

“…The coupling between the sections is described using the transfer matrix 12 T  with the coupling constants c ij calculated using the integral over the power overlap of the modes involved. The final transmission can be found by multiplying the matrices for the three sections, where the elements of the final vector (…”

Propagation Characteristics of Multilayer Hybrid Insulator-Metal-Insulator and Metal-Insulator-Metal Plasmonic Waveguides

“…In refs. [10][11][12][13][14] the 2D constrained HMI waveguide and related devices are investigated. References [15] and [16] deals with 2D HMIM waveguides and [17][18][19] with 2D HIMI waveguides.…”