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Subwavelength Grating Metamaterial Waveguides and Ring Resonators on a Silicon Nitride Platform

2022; Wiley; Volume: 17; Issue: 2 Linguagem: Inglês

10.1002/lpor.202200216

1863-8899

Cameron M. Naraine, Jocelyn N. Westwood‐Bachman, Cameron Horvath, Mirwais Aktary, Andrew P. Knights, Jens H. Schmid, Pavel Cheben, Jonathan D. B. Bradley,

Advanced Fiber Optic Sensors

Abstract Subwavelength grating (SWG) metamaterial waveguides and ring resonators on a silicon nitride platform are proposed and demonstrated. 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 (2.11 × 10 5 ) and low propagation loss (≈1.5 dB cm −1 ) 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.