Shurui Wang

TL;DR: A subwavelength refractive index engineered nanostructure is demonstrated to mitigate loss and wavelength resonances by suppressing diffraction effects, enabling a coupling efficiency over 92% (0.32 dB) and polarization independent operation for a broad spectral range exceeding 100 nm.

TL;DR: In this paper, the authors leverage the inherent anisotropy and dispersion of a sub-wavelength structured photonic metamaterial to demonstrate ultra-broadband integrated beamsplitting.

TL;DR: This work reports on a grating coupler with sub-decibel experimental coupling efficiency using a single etch process in a standard 220-nm silicon-on-insulator (SOI) platform, and demonstrates a subwavelength metamaterial refractive index engineered nanostructure with backside metal reflector.

TL;DR: A measured fiber-chip coupling efficiency of -1.3 dB is reported, the highest coupling efficiency achieved to date for a surface grating coupler in a 220 nm silicon-on-insulator platform fabricated in a conventional dual-etch process without high-index overlays or bottom mirrors.

TL;DR: In this paper, the authors have demonstrated using simulations and experiments that a high coupling efficiency can be achieved for an arbitrary buried oxide thickness by judicious adjustment of the grating radiation angle.