Wang Chenglin, Gao Dongliang, Gao Lei
Opt Express. 2022 Apr 11;30(8):12722-12731. doi: 10.1364/OE.453669.
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.
随着纳米制造技术和非线性光学的快速发展，纳米结构的非线性检测备受关注。在本文中，我们研究了包裹有石墨烯的球形非局域等离子体纳米颗粒的二次谐波产生。我们开发了一种简单的方法来计算二次谐波频率下的电场，并分析金属的非局域响应对二次谐波的影响。我们发现这种纳米结构可以通过检测二次谐波产生的辐射强度来探测材料的性质。此外，等离子体核心的非局域响应可以提高二次谐波产生的吸收效率。我们的研究可能为研究等离子体量子效应和非线性探测技术以及提高光子器件的非线性转换效率提供一种新方法。
