Abstract
The plasmonic properties of an asymmetric dimer, comprising of two silver nanospheres with different radii, are studied by the finite difference time domain method. The extinction efficiencies of the plasmonic dimer are numerically calculated in the visible and near-infrared regime, i.e., from 950 to 150 THz. Two distinguishable Fano resonances are observed when the separation between the nanospheres is narrowed within a certain value, e.g., less than 10 nm. The extinction spectrum that presents two Fano resonances, associated with two electromagnetic modes, is well fitted using a model consisting of two Fano lineshape functions. The resonance frequencies, the spectral widths, and the characteristic q values are obtained via the best fit parameters, and their trends are revealed with varying the radii of the nanospheres. The fitting scheme proposed in this work may be useful in the study of other plasmonic nanostructures with multiple Fano resonances.
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References
Babaei, F., Javidnasab, M., Rezaei, A.: Localized surface plasmons of supershape nanoparticle dimers. Plasmonics 14, 285–291 (2019)
Brown, S.D.M., Jorio, A., Corio, P., Dresselhaus, M.S., Saito, R., Kneipp, K.: Origin of the breit-wigner-fano lineshape of the tangential G-band feature of metallic carbon nanotubes. Phys. Rev. B 63, 155413 (2001)
Chang, Y., Jiang, Y., Sun, X.: Plasmonic coupling from silver nanoparticle dimer array mediating surface plasmon resonant enhancement on the thin silver film. Appl. Phys. B 113, 503–509 (2013)
Das, A., Ahmed, A., Hasan, M.M.: Observation of Fano resonance in silver nanocube-nanosphere dimer. Pramana 94, 128 (2020)
Fano, U.: Effects of configuration interaction on intensities and phase shifts. Phys. Rev. 124, 1866–1878 (1961)
Genet, C., van Exter, M.P., Woerdman, J.P.: Fano-type interpretation of red shifts and red tails in hole array transmission spectra. Opt. Commun. 255, 331–336 (2003)
Jiang, B.Z., Sun, C.: On the plasmonic properties of a symmetry-breaking silver nanoring structure. Phys. E 101, 62–70 (2018)
Joe, Y.S., Satanin, A.M., Klimeck, G.: Interactions of Fano resonances in the transmission of an Aharonov-Bohm ring with two embedded quantum dots in the presence of a magnetic field. Phys. Rev. B 72, 115310 (2005)
Johnson, A.C., Marcus, C.M., Hanson, M.P., Gossard, A.C.: Coulomb-modified fano resonance in a one-lead quantum dot. Phys. Rev. Lett. 93, 106803 (2004)
Khan, A.D., Khan, S.D., Khan, R.U., Ahmad, N., Ali, A., Khalil, A., Khan, F.A.: Generation of multiple fano resonances in plasmonic split nanoring dimer. Plasmonics 9, 1091–1102 (2014)
Kobayashi, K., Aikawa, H., Sano, A., Katsumoto, S., Iye, Y.: Fano rresonance in a quantum wire with a side-coupled quantum dot. Phys. Rev. B 70, 035319 (2004)
Kumar, A., Solanki, A., Manjappa, M., Ramesh, S., Srivastava, Y.K., Agarwal, P., Sum, T.C., Singh, R.: Excitons in 2D perovskites for ultrafast terahertz photonic devices. Sci. Adv. 6, eaax8821 (2020)
Li, W.: Physics models of plasmonics: single nanoparticle, complex single nanoparticle, nanodimer, and single nanoparticle over metallic thin film. Plasmonics 13, 997–1014 (2018)
Luk’yanchuk, B., Zheludev, N.I., Maier, S.A., Halas, N.J., Nordlander, P., Giessen, H., Chong, C.T.: The fano resonance in plasmonic nanostructures and metamaterials. Nat. Mater. 9, 707–715 (2010)
McMahon, J.M., Henry, A.I., Wustholz, K.L., Natan, M.J., Freeman, R.G., Duyne, R.P.V., Schatz, G.C.: Gold nanoparticle dimer plasmonics: finite element method calculations of the electromagnetic enhancement to surface-enhanced raman spectroscopy. Anal. Bioanal. Chem. 394, 1819–1825 (2009)
Mies, F.H.: Configuration interaction theory effects of overlapping resonances. Phys. Rev. 175, 164 (1968)
Miroshnichenko, A.E., Flach, S., Kivshar, Y.S.: Fano resonances in nanoscale structures. Rev. Mod. Phys. 82, 2257–2298 (2010)
Palik, E.D.: Handbook of optical constants of solids, vol. 3. Academic press, Cambridge (1998)
Singh, R., Al-Naib, I., Chowdhury, D.R., Cong, L., Rockstuhl, C., Zhang, W.: Probing the transition from an uncoupled to a strong near-field coupled regime between bright and dark mode resonators in metasurfaces. Appl. Phys. Lett. 105, 081108 (2014)
FDTD Solutions, www.lumerical.com
Srivastava, Y.K., Ako, R.T., Gupta, M., Bhaskaran, M., Sriram, S., Singh, R.: Terahertz sensing of 7nm dielectric film with bound states in the continuum metasurfaces. Appl. Phys. Lett. 115, 151105 (2019)
Sun, C.: On the plasmonic properties of Ag\(@\)SiO2\(@\)graphene core-shell. Plasmonics 13, 1671–1680 (2018)
Sun, G., Khurgin, J.B., Bratkovsky, A.: Coupled-mode theory of field enhancement in complex metal nanostructures. Phys. Rev. B 84, 045415 (2011)
Tan, T.C.W., Plum, E., Singh, R.: Lattice-enhanced fano resonances from bound states in the continuum metasurfaces. Adv. Opt. Mater. 8, 1901572 (2020)
Theiss, J., Aykol, M., Pavaskar, P., Cronin, S.B.: Plasmonic mode mixing in nanoparticle dimers with nm-separations via substrate-mediated coupling. Nano Res. 7(9), 1344–1354 (2014)
Toroghi, S., Kik, P.G.: Cascaded plasmon resonant field enhancement in nanoparticle dimers in the point dipole limit. Appl. Phys. Lett. 100, 183105 (2012)
Wang, Q., Pan, S., Guo, Y., Li, R., Liu, K.: Plasmonic effect of a nanoshell dimer with different gain materials materials. Plasmonics 9, 1463–1469 (2014)
Acknowledgements
C.Sun acknowledges support by Grant Number LJKQZ2021171 from the Basic Research Programme of Liaoning Province of China. D.D. Dong acknowledges support by Grant Number 51801017 from the National Natural Science Foundation of China.
Funding
C.Sun acknowledges support by Grant Number LJKQZ2021171 from the Basic Research Programme of Liaoning Province of China. D.D. Dong acknowledges support by Grant Number 51801017 from the National Natural Science Foundation of China.
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Gu, J., Dong, D., Xiong, T. et al. Investigation of the fano lineshapes in plasmonic asymmetric silver nanosphere dimer. Opt Quant Electron 54, 447 (2022). https://doi.org/10.1007/s11082-022-03872-9
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DOI: https://doi.org/10.1007/s11082-022-03872-9