2022/09/19 by Cameron M. Naraine, Naraine, Cameron M., Jocelyn N. Westwood‐Bachman +13 · 1 citation
Engineering · Materials Science · #Advanced Fiber Optic Sensors #FOS: Physical sciences #Optical Coatings and Gratings #Optics (physics.optics) #Photonic and Optical Devices
paper · pdf · doi:10.48550/arxiv.2209.09282
openalex publication_date 2022/09/19 · openalex created_date 2022/09/23 · openalex updated_date 2026/07/28
We propose and demonstrate subwavelength grating (SWG) metamaterial waveguides and ring resonators on a silicon nitride platform for the first time. The SWG waveguide is engineered such that a large overlap of 53% of the Bloch mode with the top cladding material is achieved, demonstrating excellent potential for applications in evanescent field sensing and light amplification. The devices, which have critical dimensions greater than 100 nm, are fabricated using a commercial rapid turn-around silicon nitride prototyping foundry process using electron beam lithography. Experimental characterization of the fabricated device reveals excellent ring resonator internal quality factor (2.11x105) and low propagation loss (~1.5 dB/cm) in the C-band, a significant improvement of both parameters compared to silicon based SWG ring resonators. These results demonstrate the promising prospects of SWG metamaterial structures for silicon nitride based photonic integrated circuits.