摘要We analyze the electric field modes excited in resonant L-shaped gold nanoparticles using a finite-difference time domain method. Compared to a single gold nanorod, both the odd and even modes of the L-shaped nanoparticles can be excited due to the symmetry breaking. The nanoparticles with equal and unequal arms have different dependence of field enhancement and mode on the incident polarization.
Abstract：We analyze the electric field modes excited in resonant L-shaped gold nanoparticles using a finite-difference time domain method. Compared to a single gold nanorod, both the odd and even modes of the L-shaped nanoparticles can be excited due to the symmetry breaking. The nanoparticles with equal and unequal arms have different dependence of field enhancement and mode on the incident polarization.
[1] Elghanian R et al 1997 Science 277 1078 [2] Haes A J et al 2005 J. Am. Chem. Soc. 127 2264 [3] Maier S A et al 2003 Nature Mater. 2 229 [4] Quinten M et al 1998 Opt. Lett. 23 1331 [5] Hohenau A et al 2006 Phys. Rev. B 73 155404 [6] Hohenau A et al 2007 Phys. Rev. B 75 085104 [7] Kottmann J P et al 2001 J. Electron Microscopy 202 60 [8] Sherry L J et al 2006 Nano Lett. 6 2060 [9] Aizpurua J et al 2003 Phys. Rev. Lett. 90057401 [10] Prodan E et al 2003 Science 302 419 [11] Imura K et al 2006 Appl. Phys. Lett. 88023104 [12] Aizpurua J et al 2005 Phys. Rev. B 71 235420 [13] Huang H J et al 2007 Opt. Express 15 7132 [14] Mertens H, Biteen J S, Atwater H A and Polman A 2006 Nano Lett. 6 2622 [15] Canfield B K et al 2005 Appl. Phys. Lett. 86183109 [16] Sung J, Hicks E M, Van Duyne R P and Spears K G 2007 J. Phys. Chem. C 111 10368 [17] Canfield B K et al 2004 Opt. Express 12 5418 [18] Canfield B K et al 2005 J. Opt. A: Pure Appl. Opt. 7 S110 [19] Tuovinen H et al 2002 J. Nonlin. Opt. Phys. 11 421 [20] Kunz K S and Luebbers R J 1998 The Finite DifferenceTime Domain Method for Electrodynamics (Florida: CRC) p 105 [21] Schider G, Krenn J R et al 2003 Phys. Rev. B 68 155427
2009, Vol. 26 
