Tunable Plasmonic Nanoparticles Based on Prolate Spheroids

Document Type : Research Article


Assistant Professor, Department of Electrical Engineering, Amirkabir University of Technology, Tehran, Iran


Metallic nanoparticles can exhibit very large optical extinction in the visible spectrum due to localized surface plasmon resonance. Spherical plasmonic nanoparticles have been the subject of numerous studies in recent years due to the fact that the scattering response of spheres can be analytically evaluated using Mie theory. However a major disadvantage of metallic spherical nanoparticles is that their resonance wavelength is independent of the particle dimensions.
In this paper, plasmonic resonance of spheroidal metallic nanoparticles is studied. Using the quasi-static approximation, the resonance condition for localized surface plasmon of spheroidal nanoparticles is derived. It is shown that unlike spherical nanoparticles in which the resonance wavelength is independent of the particle dimensions, the additional degree of freedom in spheroids allows for tuning the resonant wavelength. Additionally a formal approach to tune the surface plasmonic resonance of nano-spheroids to a wavelength of interest is presented. The results are confirmed by performing full-wave simulation for gold nanoparticles.


[1] M. Hu, J. Chen, Z. Y. Li, L. Au, G. V. Hartland, X. Li, M. Marquez, and Y. Xia, “Gold nanostructures: engineering their plasmonic properties for biomedical applications,” Chem. Soc. Rev., vol. 35, pp. 1084–1094, 2006.
[2] N. Flidj, G. Laurent, J. Aubard, G. Lvi, A. Hohenau, J. R. Krenn, and F. R. Aussenegg, “Grating-induced plasmon mode in gold nanoparticle arrays,” The Journal of Chemical Physics, vol. 123, no. 22, pp. –, 2005.
[3] B. Lamprecht, G. Schider, R. T. Lechner, H. Ditlbacher, J. R. Krenn, A. Leitner, and F. R. Aussenegg, “Metal nanoparticle gratings: Influence of dipolar particle interaction on the plasmon resonance,” Phys. Rev. Lett., vol. 84, pp. 4721–4724, May 2000.
[4] C. Bauer, G. Kobiela, and H. Giessen, “2D quasiperiodic plasmonic crystals,” Sci. Rep., vol. 2, pp. 1–6, 2012.
[5] A. Gopinath, S. V. Boriskina, B. M. Reinhard, and L. Del Negro, “Deterministic aperiodic arrays of metal nanoparticles for surface-enhanced Raman scattering (SERS),” Opt. Express, vol. 17, no. 5, pp. 3741–3753, 2009.
[6] F. Le, D. W. Brandl, Y. A. Urzhumov, H. Wang, J. Kundu, N. J. Halas, J. Aizpurua, and P. Nordlander, “Metallic nanoparticle arrays: A common substrate for both surface-enhanced Raman scattering and surface-enhanced infrared absorption,” ACS Nano, vol. 2, no. 4, pp. 707–718, 2008.
[7] A. Gopinath, S. V. Boriskina, N. Feng, B. M. Reinhard, and L. Del Negro, “Photonic-plasmonic scattering resonances in deterministic aperiodic structures,” Nano Letters, vol. 8, no. 8, pp. 2423–2431, 2008.
[8] S.J Oldenburg, R.D Averitt, S.L Westcott, and N.J Halas, “Nano-engineering of optical resonances,” Chemical Physics Letters, vol. 288, no. 24, pp. 243 – 247, 1998.
[9] S. Link and M. A. El-Sayed, “Spectral properties and relaxation dynamics of surface plasmon electronic oscillations in gold and silver nanodots and nanorods,” The Journal of Physical Chemistry B, vol. 103, no. 40, pp. 8410–8426, 1999.
[10] M.F. Pantoja, M.G. Bray, D.H. Werner, P.L. Werner, and A.R. Bretones, “A computationally efficient method for simulating metal-nanowire dipole antennas at infrared and longer visible wavelengths,” Nanotechnology, IEEE Transactions on, vol. 11, no. 2, pp. 239–246, March 2012.
[11] V. A. Podolskiy, A. K. Sarychev, E. E. Narimanov, and V. M. Shalaev, “Resonant light interaction with plasmonic nanowire systems,” Journal of Optics A: Pure and Applied Optics, vol. 7, no. 2, pp. S32, 2005.
[12] B. Luk’yanchuk, N. I. Zheludev, S. A. Maier, N. J. Halas, P. Nordlander, H. Giessen, and C. T. Chong, “The Fano resonance in plasmonic nanostructures and metamaterials,” Nature materials, vol. 9, no. 9, pp. 707–715, 2010.
[13] C. F. Bohren and D. R. Huffman, Absorption and Scattering of Light by Small Particles, Wiley-VCH, Weinheim, Germany, 2004.
[14] J. D. Jackson, Classical Electrodynamics, Wiley, New York, NY, 1975.
[15] W. Cai and V. Shalaev, Optical Metamaterials, Springer, New York, 2010.
[16] E. Krugel, The Physics of Interstellar Dust, IOP Publishing Ltd, London, UK, 2003.
[17] CST Microwave Studio 2012, CST Gmbh (http://www.cst.com), 2012.
[18] M. Quinten, Optical Properties of Nanoparticle Systems: Mie and Beyond, Wiley-VCH, Weinheim, Germany, 2011.