Plasmonic coupling in Au, Ag and Al nanosphere homo-dimers for sensing and SERS

被引:12
作者
Katyal, Jyoti [1 ]
机构
[1] Amity Univ, Amity Inst Appl Sci, Noida, UP, India
关键词
Localised surface plasmon resonance; Homo-dimer; near-field enhancement; FDTD;
D O I
10.7716/aem.v7i2.563
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
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 similar to 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.
引用
收藏
页码:83 / 90
页数:8
相关论文
共 23 条
  • [11] Self-similar chain of metal nanospheres as an efficient nanolens
    Li, KR
    Stockman, MI
    Bergman, DJ
    [J]. PHYSICAL REVIEW LETTERS, 2003, 91 (22)
  • [12] A reflection-based localized surface plasmon resonance fiber-optic probe for biochemical sensing
    Lin, Yongbin
    Zou, Yang
    Lindquist, Robert G.
    [J]. BIOMEDICAL OPTICS EXPRESS, 2011, 2 (03): : 478 - 484
  • [13] E-Beam Patterned Gold Nanodot Arrays on Optical Fiber Tips for Localized Surface Plasmon Resonance Biochemical Sensing
    Lin, Yongbin
    Zou, Yang
    Mo, Yuanyao
    Guo, Junpeng
    Lindquist, Robert G.
    [J]. SENSORS, 2010, 10 (10) : 9397 - 9406
  • [14] Ultraviolet surface-enhanced Raman scattering at the plasmonic band edge of a metallic grating
    Mattiucci, Nadia
    D'Aguanno, Giuseppe
    Everitt, Henry O.
    Foreman, John V.
    Callahan, John M.
    Buncick, Milan C.
    Bloemer, Mark J.
    [J]. OPTICS EXPRESS, 2012, 20 (02): : 1868 - 1877
  • [15] Plasmon hybridizaton in nanoparticle dimers
    Nordlander, P
    Oubre, C
    Prodan, E
    Li, K
    Stockman, MI
    [J]. NANO LETTERS, 2004, 4 (05) : 899 - 903
  • [16] UV plasmonic-based sensing properties of aluminum nanoconcave arrays
    Norek, Malgorzata
    Wlodarski, Maksymilian
    Matysik, Piotr
    [J]. CURRENT APPLIED PHYSICS, 2014, 14 (11) : 1514 - 1520
  • [17] Geometry dependence of field enhancement in 2D metallic photonic crystals
    Paudel, Hari P.
    Bayat, Khadijeh
    Baroughi, Mahdi Farrokh
    May, Stanley
    Galipeau, David W.
    [J]. OPTICS EXPRESS, 2009, 17 (24): : 22179 - 22189
  • [18] Interacting metal nanoparticles: Optical properties from nanoparticle dimers to core-satellite systems
    Pellegrini, G.
    Mattei, G.
    Bello, V.
    Mazzoldi, P.
    [J]. MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, 2007, 27 (5-8): : 1347 - 1350
  • [19] A hybridization model for the plasmon response of complex nanostructures
    Prodan, E
    Radloff, C
    Halas, NJ
    Nordlander, P
    [J]. SCIENCE, 2003, 302 (5644) : 419 - 422
  • [20] Refractive Index Sensitivity Analysis of Ag, Au, and Cu Nanoparticles
    Sekhon, Jagmeet Singh
    Verma, S. S.
    [J]. PLASMONICS, 2011, 6 (02) : 311 - 317