We study the effective second-harmonic generation (SHG) susceptibility in graded metallic films by invoking the local field effects exactly and further numerically demonstrate that graded metallic films can serve as a novel optical material for producing a broad structure in both the linear and the SHG response and an enhancement in the SHG signal.
© 2005 Optical Society of America
J. P. Huang and K. W. Yu, "Second-harmonic generation in graded metallic films," Opt. Lett. 30, 275-277 (2005)