One-dimensional dielectric grating structure for plasmonic coupling and routing.

ABSTRACT: We propose and demonstrate one-dimensional (1-D) TiO₂ dielectric grating structures that couple 793-nm wavelength light and two-dimensional (2-D) surface plasmon polaritons (SPPs) into guided 1-D SPPs supported by dielectric-loaded plasmonic waveguides. The 1-D grating structure consists of a central TiO₂ stripe with a periodic array of TiO₂ teeth attached to the stripe. Finite-difference time-domain (FDTD) simulations reveal that the electromagnetic boundary conditions created by the teeth bend the electric field and induce charge oscillations under the grating, enabling excitation of SPPs. The same mechanism supports the routing of 2-D SPP. In the simulation the symmetric gratings achieve a maximum coupling efficiency of 19.1 % at an optimized grating per

SUBMITTER: Nguyen LYT 

PROVIDER: S-EPMC12717937 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature