Abstract：Plasmonic nanostructures with their unique ability in confining strong electromagnetic fields into subwavelength regions have led to a great diversity of applications. We have utilized various designs to study plasmonic thermal emitters and surface-enhanced Raman scattering substrates. Recently, optical resonator arrays with spatially varying geometry and subwavelength separation known as metasurfaces demonstrate additional degree of freedom to accomplish polarization control and wavefront shaping. In addition, we also focused on the studies of all-dielectric nanophotonics to sustain high quality-factor resonances for refractive-index sensing and nonlinear optics.