Plasmon Line Widths of Single Silver Nanoprisms as a Function of Particle Size and Plasmon Peak Position

详细信息    查看全文

• 作者：Keiko Munechika ; Jessica M. Smith ; Yeechi Chen ; David S. Ginger
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：December 27, 2007
• 年：2007
• 卷：111
• 期：51
• 页码：18906 - 18911
• 全文大小：255K
• 年卷期：v.111,no.51(December 27, 2007)
• ISSN：1932-7455

文摘

We study the homogeneous line width of the plasmon resonance scattering peaks of anisotropic silvernanoparticles using single particle darkfield scattering spectroscopy. We correlate the scattering spectra withscanning electron microscopy images of the particles to investigate the effects of nanoparticle size on theplasmon line width. We observe that the scattering line widths of silver nanoprisms increase both as theparticle volume increases and as the plasmon resonance energy increases. We attribute the size dependenceto radiation damping and compare our data both to simple dipole-limit approximations for the radiative andnonradiative decay rates and with finite-difference time-domain (FDTD) calculations of the scattering linewidth. We find the data and calculations in good agreement for an appropriate choice of the bulk opticalconstants of silver and find that the dipole-limit approximations capture the observed size and energy-dependence of the plasmon line widths.