Development of plasmon-resonance of metal nanoparticles enhanced harmonic generation in nonlinear medium

With the development of nano-processing and preparation techniques, the characteristics of plasmon optics of metal nanoparticles have been widely studied and applied. Based on metal nanoparticles plasmon-resonance characteristics, the article introduces metal nanoparticles plasmon-resonance enhanced harmonic generation in nonlinear media, and reviews the research results of harmonic generation and biological harmonic imaging applications in recent years. The trend of plasmon-resonance of metal nanoparticles enhanced harmonic generation in nonlinear medium is that the metal nanoparticles range from simple metal nanoparticles to metal nanoparticles with complex shape and assembly. The novel metal nanoparticles have a good practical application in the field of nonlinear optics, biomedical diseases diagnosis and treatment.