Subwavelength grating filtering devices

We propose and simulate the characteristics of optical filters based on subwavelength gratings. In particular, we demonstrate through numerical simulations the feasibility of implementing SWG Bragg gratings in silicon-on-insulator (SOI). We also propose SWG ring resonators in SOI and verify their operation using numerical simulations and experiments. The fabricated devices exhibit an extinction ratio as large as 30 dB and a Qfactor as high as ∼20,000. These fundamental SWG filters can serve as building blocks for more complex devices. © 2014 Optical Society of America