Research

Photonic crystals are artificial optical materials with a periodic refractive index structure on the wavelength scale. They enable sophisticated control of light and exhibit unique optical phenomena that are difficult to achieve with conventional optical materials. In particular, a photonic crystal nanocavity—created by intentionally introducing a “defect” into the periodic structure—serves as a powerful platform for a wide range of applications. Such nanocavities confine light extremely tightly in an ultrasmall volume, making it possible to miniaturize various photonic devices. Moreover, the strong light confinement significantly enhances light-matter interactions, leading to the emergence of novel physical phenomena and enabling applications in quantum information technologies.

We are conducting research on the realization of high-quality photonic nanostructures, including photonic crystals, and the control of light and light-matter interactions using these structures, as well as their applications. Our work also extends to topological wave engineering, exploring the control of optical angular momentum through photonic nanostructures and the topological properties of waves such as light and elastic waves, with a focus on practical applications. In addition, we are developing nanofabrication techniques for diamond, a key platform for quantum technologies, and applying them to nanophotonic devices. Furthermore, led by Assistant Professor Jinno, we are pioneering nanophotonics research based on gallium oxide, a wide-bandgap semiconductor, covering a broad range of topics from crystal growth and optical property characterization to nanofabrication and device applications.

Main Research Subjects

For details, please see the separate page of each subject or the recent research presentation page.

Design and Fabrication of Photonic Nanostructures

We are aiming at realizing high quality photonic nanostructures and at opening a new paradigm of lightwave control by using such advanced photonic nanostructures.

Control of Light-Matter Interactions using Photonic Nanostructures

We are exploring the underlying physics and aiming to apply it to novel functions and device development. We are also advancing research on integrated quantum photonics.

Topological Photonics and Topological Phononics

Topological photonics, an emerging field in photonic, is one of main research subjects of our group. The concept of band topology provides novel approaches to control not only light but also sound and elastic waves. We are also exploring topological states of sound and elastic wave.

Wide-Bandgap Semiconductor Nanophotonics

We are challenging the development of new frontiers in nanophotonics and quantum photonics by utilizing wide-bandgap semiconductors such as diamond and gallium oxide.