Surface plasmon resonance enhanced light absorption and wavelength tuneable in gold-coated iron oxide spherical nanoparticle

Surface plasmon in nano-sized particles, such as gold, silver, copper and their composites, has recently attracted a great deal of attention due to its possible uses in many applications, especially in life sciences. It is desirable for application devices with a tenability of surface plasmon wavele...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2018-06, Vol.456, p.368-371
Main Authors: Dasri, Thananchai, Chingsungnoen, Artit
Format: Article
Language:English
Subjects:
Absorption spectra
Approximation
Core-shell particles
Electromagnetic absorption
Electromagnetism
Faraday effect
Gold
Iron oxides
Nanocomposites
Nanoparticles
Optical properties
Surface chemistry
Surface plasmon resonance
Visible spectrum
Wavelet transforms
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Summary:Surface plasmon in nano-sized particles, such as gold, silver, copper and their composites, has recently attracted a great deal of attention due to its possible uses in many applications, especially in life sciences. It is desirable for application devices with a tenability of surface plasmon wavelength and optical properties enhancement. This article presents enhanced optical light absorption and tunable wavelength in gold-coated magnetite (Fe3O4@Au core-shell) nanoparticles embedded in water using the theoretical method of discrete dipole approximation (DDA). The absorption spectra in the wavelengths from 350 to 900 nm were found to be the spectra obtained from Fe3O4@Au core-shell nanoparticles, and when compared with pure Fe3O4 nanoparticles, the surface plasmon resonance can be enhanced and tuned over the entire visible spectrum (viz. 350–800 nm) of the electromagnetic spectrum by varying the Au shell thickness (2–5 nm). Similarly, the Faraday rotation spectra can also be obtained.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.02.066