Slotted Subwavelength Grating Waveguides for Compact Optofluidic Sensors

We experimentally demonstrate a slotted subwavelength grating (SSWG) waveguide on a silicon-on-insulator platform. The waveguide was included in an asymmetric Mach-Zehnder interferometer, and a fluid sensing experiment was performed. The estimated mode sensitivity (79%) is consistent with the simulation results (83%). The high mode sensitivity of the SSWG waveguide makes it suitable for compact integrated optofluidic sensors.