Xiaochuan Xu

TL;DR: This paper presents some of the notable advances in silicon-based passive and active optical interconnect components, and highlights some of their key contributions.

TL;DR: A 16-element optical phased array integrated on chip is presented for achieving two-dimensional (2D) optical beam steering, which enables narrow far field beam widths while mitigating the precise etching needed for conventional shallow etch gratings.

TL;DR: Novel device architectures and improved fabrication techniques have paved a viable way for realizing low-cost, high-density, multi-function integrated devices in the MIR, which is expected to benefit several application domains in the years to come, including communication networks, sensing, and nonlinear systems.

Abstract: We demonstrate a through-etched grating coupler based on subwavelength nanostructure. The grating consists of arrays of 80 nm × 343 nm rectangular air holes, which can be patterned in a single lithography/etch. A peak coupling efficiency of 59% at 1551.6 nm and a 3 dB bandwidth of 60 nm are achieved utilizing the silicon-on-insulator platform with a 1 μm thick buried-oxide layer for transverse electric mode. The performance is comparable to gratings requiring much more complicated fabrication processes.

TL;DR: Unique surface sensing property and enhanced sensitivity in microring resonator biosensors based on subwavelength grating (SWG) waveguides are studied and demonstrated.