We analytically study second-harmonic (SH) generation from thin metallic films with subwavelength noncentrosymmetric patterns. Because the thickness of the film is much smaller than the SH wavelength, retardation effects are negligible. The far-field SH intensities are thus dominated by an effective electric dipole. It is further demonstrated that internal bulk SH polarization density is comparable with its surface counterpart. The electric dipole, consequently, originates from the entire volume of the metallic membrane.
© 2009 Optical Society of America
Original Manuscript: May 8, 2009
Revised Manuscript: July 11, 2009
Manuscript Accepted: August 21, 2009
Published: September 14, 2009
Yong Zeng and Jerome V. Moloney, "Volume electric dipole origin of second-harmonic generation from metallic membrane with noncentrosymmetric patterns," Opt. Lett. 34, 2844-2846 (2009)