Our research group focuses on fundamental and applied studies on artificially engineered electromagnetic materials, or the so-called metamaterials and metasurfaces. Especially, we develop new material properties that allow us to overcome limitations or restrictions of conventional materials available in nature. We also study on applying such materials for development of new devices.
In general materials available in nature vary their electromagnetic responses to the frequency of an incoming wave. This, in turn, indicates that if the frequency is fixed then each material always behaves in the same manner. Metamaterials, composed of periodically metalised units as well as several circuit elements including diodes, enabled us to distinguish different waves even the same frequency depending on their waveforms, namely, pulse widths. This waveform selectivity is expected to give us an additional degree of freedom to control electromagnetic waves.