NDLI: Numerical study of nanoparticle sensors based on the detection of the two-photon-induced luminescence of gold nanorod antennas

Content Provider	Springer Nature Link
Author	Huang, Zaoshan Dai, Qiaofeng Lan, Sheng Tie, Shaolong
Copyright Year	2014
Abstract	We investigate numerically the modification of the nonlinear optical properties of a nanoantenna in the trapping of nanoparticles (NPs) by using both the discrete dipole approximation method and the finite-difference time-domain technique. The nanoantenna, which is formed by two gold nanorods (GNRs) aligned end to end and separated by a small gap, can emit strong two-photon-induced luminescence (TPL) under the excitation of a femtosecond laser light which is resonant with its longitudinal surface plasmon resonance. In addition, the excited antenna can stably trap small NPs which in turn induce modifications in the emitted TPL. These two features make it a promising candidate for building highly sensitive detectors for NPs of different materials and sizes. It is demonstrated that sensors built with antennas possess higher sensitivities than those built with single GNRs and nanorod-based antennas are more sensitive than nanoprism-based antennas. In addition, it is found that the trapping probability for a second NP is significantly reduced for the antenna with a trapped NP, implying that trapping of NPs may occur sequentially. A relationship between the TPL of the system (antenna + NP) and the optical potential energy of the NP is established, enabling the extraction of the information on the optical potential energy and optical force by recording the TPL of the system. It is shown that the sequential trapping and releasing of NPs flowing in a microfluid channel can be realized by designing two different antennas arranged closely.
Starting Page	1491
Ending Page	1500
Page Count	10
File Format	PDF
ISSN	15571955
Journal	Plasmonics
Volume Number	9
Issue Number	6
e-ISSN	15571963
Language	English
Publisher	Springer US
Publisher Date	2014-08-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Gold nanorod Nanoantenna Two-photon-induced luminescence Optical potential energy Optical force Biotechnology Nanotechnology Biophysics and Biological Physics Biochemistry
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Biochemistry Biophysics Biotechnology

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