A Multimode Interferometers–Mach Zehnder Interference (MMI–MZI) polymer 2 2 thermo-optic
switch is proposed using the thermo-optical effect of polymer materials and fabricated by simple direct
ultraviolet photolithography process. We utilize a cross-linkable negative photoresist as core material.
Once exposed to ultraviolet light through a photomask, the waveguide strips can be obtained upon development.