Resonant light absorption and plasmon tunability of lateral triangular Au nanoprisms array

被引:17
作者
Gao, Mengyao [1 ,2 ]
Zheng, Xuanli [1 ,2 ]
Khan, Imran [1 ,2 ]
Cai, Haoyuan [3 ]
Lan, Jinshen [1 ,2 ]
Liu, Jing [4 ]
Wang, Jiayuan [1 ,2 ]
Wu, Jianyang [1 ,2 ]
Huang, Shengli [1 ,2 ]
Li, Shuping [1 ,2 ]
Kang, Junyong [1 ,2 ]
机构
[1] Xiamen Univ, Engn Res Ctr Micronano Optoelect Mat & Devices, Fujian Key Lab Semicond Mat & Applicat,Dept Phys, Shenzhen Res Inst,CI Ctr OSED,Minist Educ, Xiamen 361005, Fujian, Peoples R China
[2] Xiamen Univ, Engn Res Ctr Micronano Optoelect Mat & Devices, Fujian Key Lab Semicond Mat & Applicat,Dept Phys, Jiujiang Res Inst,CI Ctr OSED,Minist Educ, Xiamen 361005, Fujian, Peoples R China
[3] Zhejiang Univ, Ocean Coll, Zhoushan 316000, Peoples R China
[4] Jimei Univ, Sch Informat Engn, Xiamen 361021, Fujian, Peoples R China
基金
中国国家自然科学基金;
关键词
Triangular nanoprism; Localized surface plasmon resonance (LSPR); Finite difference time domain (FDTD); Polarization; REFRACTIVE-INDEX; NANOPARTICLE ARRAYS; OPTICAL-PROPERTIES; SILVER NANOPRISMS; SIZE; EXCITATION; SHAPE; AG;
D O I
10.1016/j.physleta.2019.125881
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Optical characteristics and electric field distribution of triangular Au nanoprism in a unit and units array under polarized light irradiation were systematically studied by numerical simulation with finite difference time domain method. It is found that the plasmonic properties of the triangular nanoprism are dominated by the electric polarization rather than the wave propagation. The triangular nanoprism presents similar optical response with a strong dipole band under different wave propagations if the electric polarization vectors are parallel to the triangular cross section. The lateral triangular Au nanoprisms array possesses a large tunability of the plasmonic properties contributed from the combined influence of inter-particle distance, particles size, polarization angle and even environmental medium. From the plasmon band shift versus the refractive index, ultra-high local surface plasmon resonance sensitivity (509.96 nm/RIU, figure of merit = 5.55) is reached at similar to 850 nm, making this array promising for biochemical sensing applications. (C) 2019 Elsevier B.V. All rights reserved.
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页数:8
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