Mikhail Artemyev,1,2 Roman Krutokhvostov,3 Dmitry Melnikau,3 Vladimir Oleinikov,4 Alyona Sukhanova,1,5 Igor Nabiev1,5
1Moscow Engineering Physics Institute (Russian Federation) 2Belarusian State Univ. (Belarus) 3CIC nanoGUNE (Spain) 4Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry (Russian Federation) 5Trinity College Dublin (Ireland)
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Considerable magneto-optical activity has been observed in aqueous solutions of colloidal noble metal nanoparticles (Au
and Ag, 2–50 nm in diameter) in a magnetic field as low as 0.5 T parallel to the propagation of the incident light exciting
localized surface plasmons in the nanoparticles. The magnetic circular dichroism (MCD) spectra show pronounced
Zeeman splitting in the plasmon absorption bands. The observed magneto-optical effects is due to the enhancement of
the magnetic Lorentz force for localized surface plasmons in resonantly excited strongly polarizable Ag and Au
nanoparticles. The magnitude and the spectral position of the MCD signal depend on the contribution of scattering and
absorption components in the extinction spectra of nanoparticles. Addition of pyridine into the colloidal solution of silver
nanoparticles causes aggregation of nanoparticles and the appearance of a characteristic intense long-wavelength band in
the extinction spectrum. The MCD spectrum also shows signals from short- and long-wavelength components. The
possible method for MCD biosensing based on controlled aggregation of plasmonic nanoparticles in the presence of
analyte followed by differential MCD detection in the long-wavelength region is discussed.
Mikhail Artemyev,Roman Krutokhvostov,Dmitry Melnikau,Vladimir Oleinikov,Alyona Sukhanova, andIgor Nabiev
"Low-field magnetic circular dichroism in silver and gold colloidal nanoparticles of different sizes, shapes, and aggregation states", Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 845729 (9 October 2012); https://doi.org/10.1117/12.929860
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Mikhail Artemyev, Roman Krutokhvostov, Dmitry Melnikau, Vladimir Oleinikov, Alyona Sukhanova, Igor Nabiev, "Low-field magnetic circular dichroism in silver and gold colloidal nanoparticles of different sizes, shapes, and aggregation states," Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 845729 (9 October 2012); https://doi.org/10.1117/12.929860