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Trapping of Micro Particles in Nanoplasmonic Optical Lattice

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Published on: September 5, 2017

Programmable nonreciprocal Poynting effect enabled by lattice metamaterials.

Le Dong^1,2, Kun Zhou³, Dong Wang^1,2

¹State Key Laboratory of Mechanical System and Vibration, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

Science Advances

|June 14, 2024

Summary

Researchers discovered the nonreciprocal Poynting effect, where shear displacements induce unequal normal stresses. This finding enables precise force control in soft metamaterials for novel applications.

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Area of Science:

Metamaterials Science
Mechanics of Materials
Soft Robotics

Background:

Shear nonreciprocity is achievable via asymmetric structures.
The nonreciprocal Poynting effect (unequal normal stresses from equal shear displacements) remains underexplored.

Purpose of the Study:

To discover and explore the nonreciprocal Poynting effect.
To develop a design framework for programming this effect in metamaterials.
To demonstrate potential applications of the nonreciprocal Poynting effect.

Main Methods:

Utilized a generalized directional truss model to discover the effect.
Employed cylindrical lattice metamaterials with antisymmetric curled microstructures.
Integrated digital generation, finite deformation theory, finite element modeling, and 3D printing for design and programming.
Demonstrated applications including bionic Poynting effect matching, wave energy converters, and unidirectional motion limitation.

Main Results:

Successfully discovered and demonstrated the nonreciprocal Poynting effect.
Developed a programmable design framework for controlling normal forces via torque.
Established a one-to-one mapping between torque and normal forces in soft devices.

Conclusions:

The nonreciprocal Poynting effect can be generated and programmed in soft metamaterials.
The developed framework facilitates the design of soft devices with precise force transmission.
This research opens avenues for advanced applications in wave energy and motion control.