Fig. 1: Integrated multimode photonics and metamaterial building block.
From: Metamaterial-enabled arbitrary on-chip spatial mode manipulation
a On-chip mode manipulation techniques and multimode photonic application scenarios. WDM wavelength-division multiplexing, SMF single-mode fiber, MMF multimode fiber, FM-MCF few-mode multicore fiber, SDM space-division multiplexing. b Dielectric perturbations are located at the “peaks” or “valleys” in the transverse mode profile of high-order mode to maximize the mode overlap integral. c Schematic view of the metamaterial TE0-TE2 building block (BB), exploiting fully etched dielectric slots on a silicon waveguide
