His research interests are mainly in the general area of physical optics. Specifically, he is interested in achieving subwavelength spatial engineering of light properties (such as phase, intensity and polarization, etc.) utilizing modern fabrication tools and nanostructure, and subsequently manipulates the light-matter interactions on the nanometer scale. The tailored light-matter interactions can provide unique functionality for photonic devices, and render unique information about their structural and dynamical properties, enabling the development of optical tweezers, integrated photonic circuits, and optical imaging tools.