  Surface acoustic waves (SAWs) hold a vast potential in various fields such as
spintronics, quantum acoustics, and electron-quantum optics, but an
electromagnetic wave emanating from SAW generation circuits has often been a
major hurdle. Here, we investigate a differential excitation method of
interdigital transducers (IDTs) to generate SAWs while reducing the
electromagnetic wave. The results show that electromagnetic waves are
suppressed by more than 90% in all directions. This suppression overcomes the
operating limits and improves the scalability of SAW systems. Our results
promise to facilitate the development of SAW-based applications in a wide range
of research fields.
