We report on the design, simulation and experimental demonstration of a new type of
waveguide crossing based on subwavelength gratings in silicon waveguides. We used 3D …

In this review, we summarize and discuss our recent studies of subwavelength grating
(SWG) structures for engineering the refractive index of silicon microphotonic waveguides …

As most integrated optics platforms, silicon offers only a fixed set of material refractive
indices for designing devices. The ability of sub-wavelength patterned structures to …

We propose and experimentally demonstrate a novel subwavelength grating coupler on
silicon-on-insulator, for coupling to optical fibers with a wide optical bandwidth. Theoretical …

We demonstrated a waveguide crossing for submicron silicon waveguides with average
insertion loss of 0.18±0.03 dB and crosstalk of-41±2 dB, uniform across an 8-inch wafer. The …

We report multimode-interference (MMI)-based crossings in high-index-contrast silicon wire
waveguides. Our experiments show an MMI crossing of~ 0.4-dB insertion loss, which …

We propose a new method for mode conversion and coupling between an optical fiber and
a sub-micrometer waveguide using a subwavelength grating (SWG) with a period less than …

We have designed a high-efficiency broadband grating coupler for coupling between silicon-
on-insulator (SOI) waveguides and optical fibers. The grating is only 13 µm long and 12 µm …

We propose a silicon waveguide-fiber grating coupler that uses a subwavelength
microstructure to achieve a continuously variable grating strength yet can be fabricated …

Compact metal grating couplers for efficient and broadband coupling between optical fibers
and silicon-on-insulator waveguides are proposed and demonstrated. Simulation results for …