All polymer asymmetric Mach–Zehnder interferometer waveguide sensor by imprinting bonding and laser polishing
(color online) Schematics of cross section of waveguide (a) when SU-8 (n = 1.571) serves as the core layer and PMMA (n = 1.495) is used as the substrate layer, (b) when PMMA (n = 1.495) serves as the core layer and PMMA (n = 1.483) is used as the substrate layer, (c) when PMMA (n = 1.495) serves as the core layer and PMMA (n = 1.483) is used as the substrate layer; (d) variations of 
