FIG. 7.25 (a) Optomechanical crystal tightly confined mechanical and optical resonances at the same physical location. This is achieved using photonic crystals to confine light and acoustic bandgap structure to confine mechanical vibrations ( Meenehan et al., 2014 ). (b) Basic setup of optical tweezer ( Ashkin et al., 1986 ) incoming spatially filtered laser beam focused using a microscope on a particle in a liquid. The focused beam undergoes reflections R₁ and R₂ and refraction by the sphere, resulting in a net upward force F_A on the particle. More about this image found in (a) Optomechanical crystal tightly confined mechanical and optical resonanc...