A suggestion for creating an excitable/oscillatory field with solid-st
ate material is proposed. Tn essence, the idea is to make a spatial ar
ray of ''mesoscopic particles'' with the characteristics of a first-or
der phase transition. A theoretical computation shows that an auto-wav
e, or excitable wave, is generated in such an excitable field. A simpl
e example of using this system as a diode in information flow is given
.