The cross-section shape-dependent responses of S and FOM of individual Au nanorod sensors

Besides aspect ratio ( AR ) and localized surface plasmon resonance (LSPR) peak wavelength, the cross-section shape of individual Au nanorod sensors is also crucial factors controlling their plasmon sensitivities. These three effects have not been investigated simultaneously till now. In this paper,...

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Published in:Applied physics. A, Materials science & processing Materials science & processing, 2019-05, Vol.125 (5), p.1-6, Article 345
Main Authors: Yang, WanChun, Chen, YangXi, Fu, TianYi, Peng, Sheng, Du, ChaoLing, Lu, YuanGang, Shi, DaNing
Format: Article
Language:English
Subjects:
Applied physics
Aspect ratio
Characterization and Evaluation of Materials
Condensed Matter Physics
Cross-sections
Dipoles
Figure of merit
Gold
Infrared windows
Machines
Manufacturing
Materials science
Mathematical analysis
Nanorods
Nanotechnology
Optical and Electronic Materials
Physics
Physics and Astronomy
Processes
Refractivity
Sensitivity
Sensors
Surfaces and Interfaces
Thin Films
Wavelengths
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Summary:Besides aspect ratio ( AR ) and localized surface plasmon resonance (LSPR) peak wavelength, the cross-section shape of individual Au nanorod sensors is also crucial factors controlling their plasmon sensitivities. These three effects have not been investigated simultaneously till now. In this paper, we numerically investigate nanorods’ cross-section-dependent responses both of refractive index sensitivity factor S and corresponding figure of merit FOM to their AR and LSPR peak wavelengths by discrete dipole approximation. The cross-section shapes are demonstrated to affect the values of S and FOM although it does not destroy the overall response tendency of S/FOM to LSPR peak wavelengths and AR . Their optimal LSPR spectral regions and AR are unveiled, which are revealed to be cross-section shape-dependent and independent, respectively. The triangular Au nanocolumn is revealed to provide good candidate for Au LSPR-based biological sensing and detection, whose optimal LSPR peak wavelength falls in the second near-infrared window.
ISSN:0947-8396
1432-0630
DOI:10.1007/s00339-019-2654-1