Subwavelength engineering in silicon photonic devices

In the past decade, there has been tremendous progress in using subwavelength-scale nanostructures with elaborately designed periodic and disordered photonic materials for applications in integrated photonics. In this paper, we review the advances in subwavelength engineering used in silicon photonic devices, with an emphasis on our own contributions on the use of subwavelength gratings and hyperuniform disordered photonic structures to attain state-of-the-art performances for near- and mid-infrared applications in fiber-chip coupling, slot waveguides for refractive-index sensing, mode conversion, wavelength filtering, integrated resonators, and ultracompact high-extinction and broadband integrated polarizers.