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We explore directed assembly of optical metamaterials that offer new ways of manipulating electromagnetic wave. These include moire metamaterials and metamaterials with colloidal particles as building blocks. We develop optothermal manipulation techniques to assemble colloidal particles into desired configurations in a scalable manner. Inline optical metrology is applied to measure structures, dynamics and properties of metamaterials at single-particle resolution. We further explore colloidal particles coupled to molecules and 2D materials for active metamaterials, devices and tools.

Chiral molecules are building blocks of life. Efficient synthesis, analysis and purification of chiral molecules underpin various applications ranging from medicine to space life detection. We develop and apply a variety of chiroptical devices that exploit the unique optical properties of chiral metamaterials and metasurfaces to improve asymmetric synthesis, enantiodiscrimination and enantioselective separation of chiral molecules.

Optofluidic lab on a chip, which integrates ultracompact optical components into micro/nanofluidic systems, enables us to probe, interrogate and control colloidal particles, biological cells and molecules at an unprecedented level. We develop a new class of optofluidic lab on a chip that exploits optical metamaterials, metasurfaces and plasmonics to bring healthcare diagnostics and therapy to underserved areas while advancing study in life sciences.