The organization of this review. (IMAGE)
Caption
Nonlinear excitation can be categorized into two types: natural and artificial. The natural type arises from the intrinsic nonlinear response of the material, while the artificial type stems from the asymmetric design of nanostructures. However, relying solely on either natural characteristics or structural design is insufficient to achieve an optimal nonlinear response. Optimization can be pursued from both excitation and collection viewpoints. Efficiency enhancement focuses primarily on improving efficiency through resonances, whereas radiation shaping aims to control the radiation pattern to increase collection efficiency. Furthermore, phase manipulation in nonlinear meta-devices can integrate the advantages of these two approaches, significantly enhancing the energy density of the nonlinear signal and enabling more complex manipulation in nonlinear processes. Finally, potential directions for nonlinear meta-devices including high-harmonic generation, nonreciprocity, time-varying systems, and quantum optics are discussed.
Credit
Rong Lin
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CC BY-NC-ND