Dual wavelength sensing based on interacting gold nanodisk trimers

被引:28
作者
Lin, Vivian Kaixin [1 ]
Teo, Siew Lang [1 ]
Marty, Renaud [2 ]
Arbouet, Arnaud [2 ]
Girard, Christian [2 ]
Alarcon-Llado, Esther [1 ]
Liu, Shu Hua [1 ]
Han, Ming Yong [1 ]
Tripathy, Sudhiranjan [1 ]
Mlayah, Adnen [2 ]
机构
[1] ASTAR, Inst Mat Res & Engn, Singapore 117602, Singapore
[2] Univ Toulouse, CNRS, Ctr Elaborat Mat & Etud Struct, F-31055 Toulouse, France
关键词
ENHANCED RAMAN-SCATTERING; NANOPARTICLE ARRAYS; NANOSPHERE TRIMERS; PLASMON RESONANCES; SIZE; NANOSTRUCTURES; SENSITIVITY; NANORINGS; NANORODS; SHAPE;
D O I
10.1088/0957-4484/21/30/305501
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Fabrication and surface plasmon properties of gold nanostructures consisting of periodic arrays of disk trimers are reported. Using electron beam lithography, disk diameters as small as 96 nm and gaps between disks as narrow as 10 nm have been achieved with an unprecedented degree of control and reproducibility. The disk trimers exhibit intense visible and infrared surface plasmon resonances which are studied as a function of the disk diameter and of the pitch between trimers. Based on simulations of the optical extinction spectra and of the electric near-field intensity maps, the resonances are assigned to a single trimer response and to collective surface plasmon excitations involving electromagnetic interaction between the trimers. The sensing properties of the disk trimers are investigated using various coating media. The reported results demonstrate the possible use of gold disk trimers for dual wavelength chemical sensing.
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页数:7
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