Figure 1
Asymmetric optomechanical forces in a dielectric photonic metamaterial. (a) Artistic impression and dimensional details of the parallel silicon nitride beam, silicon nano-bar metamaterial configuration studied. (b) Spectral dispersion of the relative optical force 
on the two nanobar elements of a single metamaterial unit cell under normally incident x-polarized illumination for both forward (−z) and backward (+z) directions of light propagation (
=Fz2−Fz1, where Fz1 and Fz2 are the optical forces on the thick and thin bars, respectively; Optical force is presented in units of P/c, where P is the incident power per unit cell and c is the speed of light in vacuum).
