Freestanding, Freeform Metamolecule Fibers Tailoring Artificial Optical Magnetism

Abstract

Metamolecule clusters support various unique types of artificial electromagnetism at optical frequencies. However, the technological challenges regarding the freeform fabrication of freestanding metamolecule clusters with programmed geometries and multiple compositions remain unresolved. Here, the freeform, freestanding raspberry‐like metamolecule (RMM) fibers based on the directional guidance of a femtoliter meniscus are presented, resulting in the evaporative co‐assembly of silica nanoparticles and gold nanoparticles with the aid of 3D nanoprinting. This method offers a facile and universal pathway to shape RMM fibers in 3D, enabling versatile manipulation of near‐ and far‐field characteristics. In particular, the authors demonstrate the ability to decrease the scattering of the millimeter‐scale RMM fiber in visible spectrum. In addition, the influence of electric and magnetic dipole modes on the directional scattering of RMM fibers is investigated. These experiments show that the magnetic response of an individual RMM can be controlled by adjusting the filling factor of gold nanoparticles. The authors anticipate that this method will allow for unrestricted design and realization of nanophotonic structures, surpassing the limitations of conventional fabrication processes.

Facile and Rapid Microcontact Printing of Additive-Free Polydimethylsiloxane for Biological Patterning Diversity

“…Each type of microtissue with a size difference of 20 μm was actualized repeatedly, which suggested that the controllable and repeatable construction of array-like 3D microtissue assembly with uniform sizes was successfully accomplished using the PDMS-micropatterned chips. This facile construction of self-assembled microtissues is quite unlike the bottom-up building approach using 3D printing (e.g., inkjet printing) for remarkable manipulation of cells and other materials (e.g., nanoparticles) based on computer/controller-aided auxiliary instruments. − …”

Angle-Resolved Polarimetry with Quasi-Bound States in the Continuum Plasmonic Metamaterials via 3D Aerosol Nanoprinting

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Formation of Linear Plasmonic Heterotrimers Using Nanoparticle Docking to DNA Origami Cages

“…Within assemblies of plasmonic metal nanoparticles (NPs), the surface plasmons of these NPs can interact and hybridize, forming collective modes in a fashion that is analogous to how electronic wave functions in atoms create molecular orbitals. , These molecule-like collective modes give rise to numerous properties unavailable in individual particles, such as strong local field enhancement, Fano resonances, magnetic resonances, , and chiral optical properties. , Consequently, these assemblies hold significant potential for applications in biomolecular sensing, , surface-enhanced Raman scattering (SERS) and fluorescence spectroscopy, , and energy harvesting. , …”