This thesis focuses on the fabrication and testing of various mechanical resonators for use inoptomechanical resonators. First photonic crystals were fabricated on existing thin film resonators to enhance their reflectivity. Second pendulum style resonators known as ”cat-flap” resonators were fabricated for optical dilution. Finally, phononic crystal resonators provided from the Niels Bohr Institute were implemented in an early test setup of an optomechanical white light cavity. In addition an angle sensor based on photonic crystal technology was proposed.