UIM Electromagnetic Waves
Microwave Spatial Modulation
Chiral light-matter interaction
vdW materials & Valleytronics
Plasmonics and metamaterials using nanoparticles
Plasmonics is a discipline of optics to study controlling light using surface plasmons in the nano scale. Plasmons are the collective oscillations of the free electrons in metals at certain resonant frequency. The excitation of plasmons is the result of light-matter interactions of metal nanostructures, and thus optical properties of plasmons are influenced by the geometry of nanostructures. This tunability of surface plasmons makes possible to control light in the nano scale, and researches during the recent decade have given innovative concepts and various applications. Among various nanostructures, nanoparticles are an important research topic because they are not only the typical nanostructure to launch surface plasmons, but also a basic building block of bigger nanostructures. In Nano Optics Lab, we have studied the optical properties of nanoparticles and their interaction. For example, we provided the dressed polarizability model which describes optical properties of interacting nanoparticles in simple analytic formula. Using this model, we can successfully predict optical properties of dense nanoparticle systems.
 Yoo, S., & Park, Q.-H. (2012). Effective permittivity for resonant plasmonic nanoparticle systems via dressed polarizability. Optics Express, 20(15), 16480. doi:10.1364/OE.20.016480