We present the design. fabrication. and characterization of submicronic grating couplers integrated on Si3N4 rib waveguide Mach-Zehnder interferometers (MZIs) for biosensing applications working in the visible spectral range for both TE and TM polarizations. Depending on the waveguide structure. https://safeersappliancers.shop/product-category/samsung-dual-cook-nv75k5571-electric-oven-black-60cm/