The roles of surface plasmon resonance and localized resonances in second-harmonic generation are investigated in a noncentrosymmetrical metallic film with a periodic subwavelength nanohole array. By using a recently developed microscopic classical theory and a three-dimensional finite-difference time-domain algorithm, numerical results show that the second-harmonic intensity is a function of the polarization and wavelength of incident waves. A peak of the second-harmonic intensity is achieved when the incident wave is along the direction perpendicular to the x-axis of nanoholes, which corresponds to the maximal extraordinary optical transmission. Meanwhile, the second harmonic is found to correlate with the group delay of incident waves.
© 2010 Optical Society of America
Original Manuscript: January 11, 2010
Manuscript Accepted: March 22, 2010
Published: April 14, 2010
Hua Lu, Xueming Liu, Renlong Zhou, Yongkang Gong, and Dong Mao, "Second-harmonic generation from metal-film nanohole arrays," Appl. Opt. 49, 2347-2351 (2010)