Multichannel nonlinear holography in a two-dimensional nonlinear photonic crystal
Xinyuan Fang, Huijun Wang, Haocheng Yang, Zhilin Ye, Yongmei Wang, Yong Zhang, Xiaopeng Hu, Shining Zhu, Min Xiao
Abstract
To manipulate the wave front of the harmonic wave, nonlinear photonic crystals (NPCs) have been employed in constructing nonlinear holography. Through designing a multi-channel ${\ensuremath{\chi}}^{2}$ structure, nonlinear multiplexing holography is reported here in NPCs. We propose a multi-channel nonlinear holography in an orbital-angular-momentum- (OAM-)multiplexing NPC. In experiment, three images encoded in a single NPC are reconstructed in second-harmonic waves distinctively, when the necessary Fourier-domain OAM-matching conditions are met, respectively. Our method not only conceptually extends nonlinear holography, but also provides a multifunctional platform for high-capacity security storage.