Main Article Content
The localized surface plasmon resonance of homo-dimer nanostructures is studied using FDTD simulations. The calculated LSPR wavelength of Au, Ag and Al nanosphere forming a homo-dimer configuration is compared and the results reveal a larger LSPR shift in Ag and Al homo-dimer than in Au homo-dimer. Taking the sensitivity of LSPR shape to the size and interparticle spacing of nanoparticle along with a surrounding refractive index, parameters like refractive index sensitivity have been determined. The spherical homo-dimer over the whole range of particle size, studied here shows the index sensitivity order as Ag>Al>Au. Hence, the use of plasmonic material towards the refractive index sensing applications is useful in this order. The average refractive index sensitivities of Ag, Al and Au are 287.09 nm/RIU, 210.21 nm/RIU and 192.47 nm/RIU in DUV-Visible-NIR region. Apart from LSPR shift, the highly confined near-field intensity enhancement of homo-dimer nanostructures for SERS has also been studied. The interacting homo-dimer nanoparticles reveals intensity enhancements in the junction. Comparing the field enhancement for Au, Ag and Al homo-dimer nanostructure 10^8-10^9 have been theoretically predicted in DUV-UV-visible region which can be used to strongly enhance the Raman scattering of molecules.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
K.L. Kelly, E. Coronado, L.L. Zhao, G.C. Schatz, The optical properties of metal nanoparticles: the influence of size, shape and dielectric environment, J. Phys. Chem. B,107 (2003) 668-677.
C.F. Bohren, D.R. Huffman, Absorption and scattering of light by small particles, Wiley interscience publication, 1998.
P.K. Jain, W. Huang, M.A. El-Sayed, On the universal scaling behavior of the distance decay of plasmon coupling in metal nanoparticle pairs: a plasmon ruler equation, Nano Lett.7 (2007) 2080-2088; P.K. Jain, M.A. El-Sayed, Plasmonic coupling in noble metal nanostructures, Chem. Phys. Lett. 487 (2010) 153-164.
P. Nordlander, C. Oubre, E. Prodan, K. Li, M.I. Stockman, Plasmon hybridization in nanoparticle dimers, Nano Lett. 4 (2004) 899-903.
E. Prodan, C. Radloff, N.J. Halas, P. Nordlander, A hybridization model for the plasmon response of complex nanostructures, Science 302(2003) 419–422.
Y. Gao, R. Zhang, J.C. Cheng, J.W. Liawc, C. Ma, Optical properties of plasmonic dimer, trimer, tetramer and pentamer assemblies of gold nanoboxes, Journal of Quantitative Spectrosc. & Radiative Transfer 125 (2013) 23.
Q.H. Wei, K.H. Su, S. Durant, X. Zhang, Plasmon resonance of finite one-dimensional Au nanoparticle chains, Nano Lett. 4 (2004) 1067-1071.
H.P. Paudel, K. Bayat, M.F. Baroughi, S. May, D.W. Galipeau, Geometry dependence of field enhancement in 2D metallic photonic crystals, Optics Express 17(2009) 22179-22189.
C.P. Burrows, W.L. Barnes, Large spectral extinction due to overlap of dipolar and quadrupolar plasmonic modes of metallic nanoparticles in arrays, Optics Express 18 (2010) 3187-3198.
K. Li, M.I. Stockman, D.J. Bergman, Self-similar chain of metal nanospheres as an efficient nanolens, Phys. Rev. Lett. 91 (2003) 227402.
G. Pellegrini, G. Mattei, V. Bello, P. Mazzoldi, Interacting metal nanoparticles: optical properties from nanoparticle dimers to core-satellite systems, Mater. Sci. Eng. C 27 (2007) 1347-1350.
Lumerical Solutions; http://docs.lumerical.com.
A. Taflove, S.C. Hagness, Computational Electrodynamics: The Finite-Difference Time-Domain Method, Norwood, MA: Artec House Publishers, 1995.
N. Mattiucci, G. D'Aguanno, H.O. Everitt, J.V. Foreman, J.M. Callahan, M.C. Buncick, M.J. Bloemer, Ultraviolet surface-enhanced Raman scattering at the plasmonic band edge of a metallic grating, Optics Express 20 (2012) 1868-1877.
M. Norek, M. Włodarski, P. Matysik, UV plasmonic-based sensing properties of aluminum nanoconcave arrays, Current Applied Physics 14 (2014) 1514-1520.
U.K. Sur, J. Chowdhury, Surface-enhanced Raman scattering: overview of a versatile technique used in electrochemistry and nanoscience, Current Science, 105 (2013) 923.
K.C. Bantz, A.F. Meyer, N.J. Wittenbergb, H. Imb, O. Kurtulusa, S.H. Leec, N.C. Lindquistb, S.H. Ohb, C.L. Haynesa, Recent progress in SERS biosensing, Phys. Chem. Chem. Phys., 13 (2011) 11551.
M. Kall, H. Xu, P. Johansson, Field enhancement and molecular response in surface enhanced Raman scattering and fluorescence spectroscopy. Journal of Raman spectroscopy. 36 (2005) 510–514.
M.H. Chowdhury, K. Ray, M.L. Johnson, S.K. Gray, J. Pond, J.R. Lakowicz, On the feasibility of using the intrinsic fluorescence of nucleotides for DNA sequencing, J. Phys. Chem. C 114 (2010) 7448-61.
M.H. Chowdhury, K. Ray, S.K. Gray, J. Pond, J.R. Lakowicz, The use of Aluminum nanostructures as platforms for metal enhanced fluorescence of the intrinsic emission of biomolecules in the ultra-violet, Proc. of SPIE 7577 (2010) 75770O-1.
J.S. Sekhon, S.S. Verma, Refractive index sensitivity analysis of Ag, Au, and Cu nanoparticles, Plasmonics 6 (2011) 311-317.
P.K. Jain, M.A. El-Sayed Noble metal nanoparticle pairs: effect of medium for enhanced nanosensing, Nano Lett. 8 (2008) 4347-4352.
Y. Lin, Y. Zou, R.G. Lindquist, A reflection-based localized surface plasmon resonance fiber-optic probe for biochemical sensing Biomed., Opt. Express 2 (2011) 478–484.
Y. Lin, Y. Zou, Y. Mo, J. Guo, R.G. Lindquist, E-beam patterned gold nanodot arrays on optical fiber tips for localized surface plasmon resonance biochemical sensing, Sensors 10 (2010) 9397–9406.