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(A) Photomicrograph of the asymmetric Mach–Zehnder (aMZI) chip (dimensions: 5 × 10 mm) with an aligned Fiber Array (FA). (B) Assignment scheme for the five balanced and the one unbalanced aMZI biosensors regarding the spotting of viral antigens: 1, 4: spike protein (SP); 2: receptor binding domain (RBD); 3, 5: nucleocapsid protein (NP); 6–11: bovine serum albumin (BSA). (C) Zoom-in on two balanced aMZI sensors with a view of the waveguide spirals and sensing windows.
