Thin cubic boron nitride films have been deposited on (001) faces of silicon substrates using ion-assisted pulsed laser deposition. Infrared transmittance spectra of the films showed strong absorption at 1080 cm-1, indicating sp3 bonding of cubic symmetry of the deposited film. Cross-sectional and plan-view transmission electron microscopy showed the structure of the films to be cubic zinc-blende with a lattice constant of 0.362 nm. The films were found to be adherent and preferentially oriented with the cubic BN [110] axis parallel to the Si [001] direction.