Frequency selective surface from optically excited semiconductor on a substrate

A dipole frequency selective surface is electronically printed on to a semiconductor backed by an insulating substrate, by means of an optical excitation. The surface impedance of the plasma-generated array is described in terms of the electron-hole concentration. Concentrations of at least 10/sup 18/ cm/sup 3/ are required for a resonant state to be reached. Whereas power is mainly dissipated at /spl sim/10/sup 17/ cm/sup -3/. The effect of the insulator thickness is briefly discussed.