Second-harmonic generation from metal-film nanohole arrays.
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.
Lu
Hua
H
State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi'an 710119, China.
Liu
Xueming
X
Zhou
Renlong
R
Gong
Yongkang
Y
Mao
Dong
D