The presented work will provide an overview of 3D microfabrication capabilities enabled by concurrent use of holographic optical tweezers and two-photon lithography in a single system. The hybrid nature of this technique allows for fabrication, manipulation, and assembly of microparticles in 3D. Exploiting these capabilities has enabled fabrication of some unprecedented metamaterials such as engineered microgranular crystals and lattices with embedded strain energy. We also demonstrated in situ characterization of 2PL structures by the means of optical manipulation and image processing.
In this work, two optical microfabrication methods are combined in a single system to enable automated fabrication of ordered three-dimensional microgranular crystals. The holographic optical tweezers approach offers precise and simultaneous handling of numerous microparticles, while two-photon polymerization enables selective joining of microparticles in desired crystal arrangements. Microgranular crystals exhibit unique nonlinear dynamic behaviors and have applications such as photonic crystals, acoustic lenses, and in shock absorbing materials. This novel fabrication approach holds potential to enable the next generation of hierarchical architectured metamaterials that cannot be fabricated with existing techniques.
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