Optimizing SERS from Gold Nanoparticle Clusters: Addressing the Near Field by an Embedded Chain Plasmon Model

被引:54
作者
Taylor, Richard W. [1 ]
Esteban, Ruben [2 ,3 ,4 ,5 ,6 ]
Mahajan, Sumeet [1 ]
Aizpurua, Javier [2 ,3 ]
Baumberg, Jeremy J. [1 ]
机构
[1] Univ Cambridge, Cavendish Lab, NanoPhoton Ctr, JJ Thomson Ave, Cambridge CB3 0HE, England
[2] Mat Phys Ctr CSIC UPV EHU, Paseo Manuel Lardizabal 4, Donostia San Sebastian 20018, Spain
[3] Donostia Int Phys Ctr DIPC, Paseo Manuel Lardizabal 4, Donostia San Sebastian 20018, Spain
[4] Natl Inst Stand & Technol, Quantum Measurement Div, Gaithersburg, MD 20899 USA
[5] Natl Inst Stand & Technol, Joint Quantum Inst, Gaithersburg, MD 20899 USA
[6] Univ Maryland, Gaithersburg, MD 20899 USA
基金
英国工程与自然科学研究理事会;
关键词
ENHANCED RAMAN-SCATTERING; LIMITED COLLOID AGGREGATION; SINGLE-MOLECULE; METALLIC NANOPARTICLE; OPTICAL-PROPERTIES; SPECTROSCOPY; NANOSTRUCTURES; APPROXIMATIONS; CUCURBITURIL; NANOANTENNAS;
D O I
10.1021/acs.jpcc.6b00506
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We study experimentally and theoretically the optimization of surface enhanced Raman scattering (SERS) from nanoplasmonic clusters of gold nanoparticles separated by a fixed subnanometer gap. To maximize the enhancement we discuss how the optimal cluster size is influenced by the constituent nanoparticle size and illumination wavelength. We find good qualitative agreement between the experimental SERS from nanoparticle clusters and a simple composite model that describes the response of the full cluster as arising from a composition of linear nanochains. For fixed illumination wavelengths encountered experimentally it is best to choose a cluster size that supports its lowest energy resonance near this wavelength. Our chain simulations indicate the existence of an optimal length also when the illumination laser is continuously tuned to the frequency that maximizes the signal. We explain the optimal length under these illumination conditions with a simple model that accounts explicitly for radiative losses.
引用
收藏
页码:10512 / 10522
页数:11
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