Optomechanical soft metamaterials 
  
作者Xiangjun Peng; Wei He; Yifan Liu; Fengxian Xin; Tian Jian Lu
期刊名称Acta Mechanica Sinica
2017
摘要We present a new kind of optomechanical soft metamaterials, which is different from conventional mechanical metamaterials for they are simple isotropic and homogenous materials without resorting to any complex nano/microstructures. This metamaterial is unique in the sense that its responses to uniaxial forcing can be tailored by programmed laser inputs to manifest different nonlinear constitutive behaviors, such as monotonic, S-shape, plateau, and non-monotonic snapping performance. To demonstrate the novel metamaterial, a thin sheet of soft material impinged by two counterpropagating lasers along its thickness direction and stretched by an in-plane tensile mechanical force is considered. A theoretical model is formulated to characterize the resulting optomechanical behavior of the thin sheet by combining the nonlinear elasticity theory of soft materials and the optical radiation stress theory. The optical radiation stresses predicted by the proposed model are validated by simulations based on the method of finite elements. Programmed optomechanical behaviors are subsequently explored using the validated model under different initial sheet thicknesses and different optical inputs, and the first- and second-order tangential stiffnesses of the metamaterial are utilized to plot the phase diagram of its nonlinear constitutive behaviors. The proposed optomechanical soft metamaterial shows great potential in biological medicine, microfluidic manipulation and other fields.
关键词Optomechanics; soft metamaterial; optical radiation stress; programmable constitutive relation
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