Topological Photonics and Topological PhononicsResearch

The propagation of light in periodic structures—as well as that of sound and elastic waves—is governed by a band structure, much like the behavior of electrons in a crystal. In condensed matter physics, the topological properties of such band structures, known as band topology, play a crucial role in the emergence of novel material phases. Applying the concept of band topology to light in photonic crystals, as well as to sound and elastic waves in periodic structures, has given rise to new fields known as topological photonics and topological phononics, which aim to realize and utilize novel functionalities.
Our research focuses on semiconductor-based topological photonics using photonic crystals, exploring fundamental physics while also pursuing applications such as topological lasers and waveguides. In addition, we are investigating the control of topological elastic wave states using larger-scale phononic crystals.