Abstract
The optical properties of magneto-plasmonic nanostructures are a current subject of research with fast-growing experimental and theoretical activities. The coexistence of iron (Fe) and noble metal (Ag/Au) nanoparticles in the same nanostructure is interesting for biomedical applications, as well as low-cost photonic devices. In this article, we investigated the optical response of Ag–Fe, Au–Fe, and Ag–Fe–Au bimetallic and trimetallic alloy nanostructures as a function of size, shape, and composition by using discrete dipole approximation (DDA) method. We observed that the localized surface plasmon resonance (LSPR) peak position in considered alloy nanostructures is enhanced by changing the particle size and shape, further strongly affected by rectangular shape in comparison to prolate, cube, triangular, and spherical shapes. The absorption and scattering spectra are found between 200 and 647 nm wavelength ranges and can be tuned in UV-visible-near-infrared region of the electromagnetic spectrum in accordance with desired applications. It has been found that the rectangular shape nanostructure show enhancement to LSPR peaks and their corresponding efficiencies in comparison to prolate, cube, triangular, and spherical shapes. The effect of size and shape on relative efficiency has also been studied. An increasing number of peaks appear in the optical spectra of considered nanostructures with higher gold concentration and show a broadening of LSPR peaks. Furthermore, it has been found that the optical response of alloys can be enhanced by varying the metal composition. The comparison of the considered nanostructure of different shape and size shows the LSPR at λmax have the ordering as rectangular > prolate > cube > triangular> spheres. The obtained results indicate the potential use of suitable magnetic-plasmonic nanostructures in medical diagnostics and biological imaging.
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Acknowledgments
The author, Pradeep Bhatia, thanks B.T. Draine and P.J. Flatau for the use of their DDA code, DDSCAT 7.3. Pradeep Bhatia is also very thankful to S.L.I.E.T. Longowal for providing financial assistance towards his Ph.D.
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Bhatia, P., Verma, S.S. & Sinha, M.M. Optical Properties Simulation of Magneto-Plasmonic Alloys Nanostructures. Plasmonics 14, 611–622 (2019). https://doi.org/10.1007/s11468-018-0839-7
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DOI: https://doi.org/10.1007/s11468-018-0839-7