利用离散偶极近似(Discrete Dipole Approximation,DDA)方法系统研究金属/石墨烯复合纳米阵列的消光特性,考察金属基底和石墨烯纳米阵列尺寸对局域表面等离子体共振峰位和强度的影响,以及研究不同基底厚度比条件下纳米复合阵列的电场分布、规律和物理本质。仿真结果表明,当保持金属基底厚度不变时,Ag/Au/石墨烯复合纳米阵列的局域表面等离子体共振峰随石墨烯原子层数的增大而增大,共振波长发生微小红移; 当保持八根石墨烯层柱和银基底厚度不变时,随金银厚度比的增大,消光光谱发生蓝移; Ag/Au/石墨烯复合纳米阵列银层表面的电场强度为最强,石墨烯纳米棒阵列的电场强度较强。

By using the method of discrete dipole approximation,the extinction property of metal/graphene composite nano-array is systematically studied,the influence of the size of metal substrate and graphene nano-array on LSPR peak position and intensity is observed,the composite nano-array’s electric field distribution,its distribution rules as well as the physical entity are explored under different substrate thickness ratios.Simulation results show that when the thickness of metal substrate remains unchanged,the LSPR resonance peak of Ag/Au/graphene composite nano-array increases with the increase of the number of graphene atomic layer,and the resonance wavelength has tiny redshift.When remaining eight graphene columns and the thickness of silver substrate unchanged,the extinction spectra has blueshift as the gold and silver thickness ratio increases.The electric field intensity of silver surface of Ag/Au/graphene composite nano-array is the strongest,the graphene nanorod array has a relatively strong electric field.