Detecting nonlocality by second-harmonic generation from a graphene-wrapped nanoparticle

• Main Authors: Gao, D. (Author), Gao, L. (Author), Wang, C. (Author)
• Format: Article
• Language: English
• Published: Optica Publishing Group (formerly OSA) 2022
• Subjects: Efficiency; Electric fields; Graphene; Harmonic analysis; Harmonic frequency; Harmonic generation; Harmonics generation; Nonlinear detection; Nonlinear optics; Nonlocal; Nonlocal response; Nonlocalities; Photonic devices; Plasmonic nanoparticle; Plasmonics; Second harmonics; SIMPLE method
• Online Access: View Fulltext in Publisher

 With the rapid development of nanofabrication technology and nonlinear optics, the nonlinear detection by nanostructures is highly appreciated. In this paper, we study the second-harmonic generation by a spherical nonlocal plasmonic nanoparticle wrapped with graphene. We develop a simple method for calculating the electric field at second-harmonic frequency and analyze the influence of the nonlocal response of the metal on the second-harmonic. We find that this nanostructure can probe the material's properties by detecting the radiation intensity of the second-harmonic generation. In addition, the nonlocal response of the plasmonic core can promote the absorption efficiency of second-harmonic generation. Our study may offer a new way for studying the plasmonic quantum effects and nonlinear probing technology and improving the nonlinear conversion efficiency of photonic devices. © 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement Journal © 2022