Research

Research Key Words

Nano-patterning, self-folding, nanocrystal assembly, photonic device, magnetics

Research Highlights

• Nanoimprinted chiral plasmonic substrates with three-dimensional nanostructures

Chiral plasmonic metamaterials can have giant optical chirality and be used in bio-sensing and light manipulation. We report a large-area fabrication method to prepare chiral substrates patterned with arrays of multilayer, three-dimensional nanostructures using a combination of nanoimprint lithography and glancing angle deposition. As one typical example, arrays of L-shaped chiral plasmonic nanostructures exhibit giant optical chirality in the infrared region with an experimentally achieved g-factor as high as 0.38. To demonstrate scalability, we fabricated a 1 cm2 chiral substrate with uniform chiral optical property.

• 3D Nanofabrication via Chemo-Mechanical Transformation of Nanocrystal/Bulk Heterostructures

High yield, functional 3D cell-sized machines are achieved by ligand-chemistry-induced folding of planar nanocrystal/bulk hetero-structures. Design rules have been established to fabricate various 3D architectures and unique physical functions can be incorporated through careful selection of nanocrystals. This technique promises to find applications in a variety of fields including artificial motors, nano-robots, and chiral optical metasurfaces.

• Wafer-scale fabrication of synthetic nanoparticles, nano-features through Nanoimprint lithography

• Fabrication of multi-layer synthetic antiferromagnetic nanoparticles and their application in biomedicine, water purification

• Patterning of wafer-scale plasmonic dimer array for surface-enhanced Raman scattering
• Fabrication of monodisperse magnetic/plasmonic nanorods