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Finite-thickness effects are analyzed theoretically for the plasma frequencyand associated dielectric response function of plasmonic films formed byperiodically aligned, infinitely thin, identical metallic cylinders. The plasmafrequency of the system is shown to have the unidirectionalsquare-root-of-momentum and quasilinear momentum spatial dispersion for thethick and ultrathin films, respectively. This spatial dispersion and theunidirectional dielectric response nonlocality associated with it can beadjusted not only by the film material composition but also by varying the filmthickness, the cylinder length, the cylinder-radius-to-film-thickness ratio,and by choosing the substrates and superstrates of the film appropriately.Application of the theory developed to the finite-thickness periodicallyaligned carbon nanotube films is discussed.

Finite-thickness effects in plasmonic films with periodic cylindrical anisotropy