Carbon nanofiber (CNF) wiring between one pair of needle-shaped carbons (NSCs) and spherical-shaped carbons (SSCs) has been synthesized at a position-restricted area using an Ar-ion laser-irradiated thermal decomposition method in ethanol. We attempted to determine the optimal conditions with regard to several parameters, e. g. wavelength, laser-irradiation time and laser power density. The wavelength of 488 nm is suitable for synthesis of CNF wiring between one pair of NSCs. The NSC and SSC density increased up to 2.2 kW/cm(2) with increases in the laser power density. When the redundant laser power density was irradiated on the Si substrate, CNF-wired NSCs and SSCs were synthesized in a laser-irradiated area for 2 min. (C) 2009 Elsevier B.V. All rights reserved.