Compounds of Formulae Iawherein R1-R9 taken independently are preferably a hydrogen atom, a halogen atom, a hydroxyl group, or any other organic groups or grouping, Z and X are independently and preferably a heteroatom such as oxygen, sulfur, or nitrogen groupings are useful for treatment of bacterial and fungal infections. The invention also relates to a method for controlling such an installation. A spatial light modulator is fabricated at the focusing position in the optical slab waveguide which allows the optical pulses subjected to optical modulation every frequency to pass therethrough according to an applied electrical signal.