Decay Times of Surface Plasmon Excitation in Metal Nanoparticles by Persistent Spectral Hole Burning

Abstract

We describe a new technique to determine the homogeneous linewidths of surface plasmon resonances of metal nanoparticles and thus measure the decay time of this collective electron excitation. The method is based on spectral hole burning and has been applied to supported oblate Ag particles with radii of 7.5 nm. From the experimental results and a theoretical model of hole burning the linewidth of 260 meV corresponding to a decay time of 4.8 fs was extracted. This value is shorter than expected for damping by bulk electron scattering. We conclude that additional damping mechanisms have been observed and reflect confinement of the electrons in nanoparticles with sizes below 10 nm.

Enhanced quantum dot emission for luminescent solar concentrators using plasmonic interaction

“…This can also be understood as a lengthening of the duration of the interaction time between the photon and an individual QD. This interaction time is determined by the lifetime of the surface plasmon (SP) excitation, which is typically in the range 5-10 fs [43], and by the decay length of the SP mode from the MNPs surface. uniform dispersions of QDs were achieved.…”

Resonance plasmon linewidth oscillations in spheroidal metallic nanoparticle embedded in a dielectric matrix

“…The damping of surface plasmon resonances in MNs has been well studied both experimentally [12][13][14][15][16][17][18][19][20][21][22][23][24] and theoretically [25][26][27][28][29][30][31][32][33] . Usually, both the bulk and the surface damping mechanisms play an important role in the * email: ngrigor@bitp.kiev.ua surface plasmon decay.…”

“…However, if electrons are confined in nanoparticles with sizes below 100Å, the electron-surface scattering comes into play. 17 The surface acts as an additional scatterer because the mean free path (MFP) of the electrons becomes comparable to the size of the particles. For very small particles, the collisions of conduction electrons with the particle surface dominate, that results in the reduction of effective MFP.…”

Optical Absorption and Photoluminescence Spectroscopy of the Growth of Silver Nanoparticles

“…Among different methods of sample preparations [6,7], silver for sodium in soda glasses through the process of ion-exchange has prompted considerable research activities during the last few years because of its' immense potential applications in optoelectronic and optical switching devices [8]. In most of the related studies, characteristic surface-plasmon-resonance (SPR) of silver nanoparticles have always been given the maximum importance due to the fast optical response (~few psec) of nanoscale metal particles in the visible range of light [9,10]. In spite of the technological significance, precise spectroscopic studies to characterize the thermal stability of these optical nanomaterials are still only successful to a limited extent [11][12][13].…”