Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 117, Issue 39, Pages 20146-20153Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp405403g
Keywords
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Funding
- National Natural Science Foundation of China [51171066]
- Ministry of Education of China [20114407110002]
- project for high-level professionals in the universities of Guangdong province, China
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We propose a numerical method to evaluate the two-photon-induced luminescence (TPL) of single gold nanorods (GNRs). The validity of this method is confirmed by the cos(4) a dependence of the TPL of single GNRs on the polarization angle a, which is in good agreement with experimental observations As comparing with their linear optical properties such as scattering and absorption, the TPL of a single GNR is found to be more sensitive to the change of the surrounding environment This property is exploited to detect nanoparticles (NPs), approaching the GNR from a far place. By monitoring the evolution of the TPL on the distance between the GNR and a NP, it is possible to extract various information on the NP, including the moving direction, position, size, and material type. For GNRs whose extinction is dominated by absorption, the response and sensitivity are found to depend strongly on their sizes. The detection of the nonlinear optical responses of GNRs may find potential applications in the fields of nanophotonics and biophotonics.
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