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Full-Text Articles in Nanoscience and Nanotechnology
Effect Of The Lattice Crystallinity On The Electron−Phonon Relaxation Rates In Gold Nanoparticles, Wenyu Huang, Wei Qian, Mostafa El-Sayed
Effect Of The Lattice Crystallinity On The Electron−Phonon Relaxation Rates In Gold Nanoparticles, Wenyu Huang, Wei Qian, Mostafa El-Sayed
Wenyu Huang
In order to study the importance of surface phonons on the electron−phonon relaxation in plasmonic nanoparticles, the effect of size, shape, and materials have recently been studied. Gold and silver nanoparticles have shown no dependence on size and shape while copper nanoparticles have shown some size dependence. This suggests that the bulk phonons, which are sensitive to the bulk-phase structure, are solely responsible for the relaxation of the hot electron in gold and silver plasmonic nanoparticles. The importance of bulk phonons should depend on the degree of crystallinity. In the present study, we have found that the electron−phonon relaxation rate …
On The Universal Scaling Behavior Of The Distance Decay Of Plasmon Coupling In Metal Nanoparticle Pairs: A Plasmon Ruler Equation, Prashant K. Jain, Wenyu Huang, Mostafa A. El-Sayed
On The Universal Scaling Behavior Of The Distance Decay Of Plasmon Coupling In Metal Nanoparticle Pairs: A Plasmon Ruler Equation, Prashant K. Jain, Wenyu Huang, Mostafa A. El-Sayed
Wenyu Huang
Localized surface plasmon resonances (LSPR) in lithographically fabricated gold (Au) nanodisc pairs are investigated using microabsorption spectroscopy and electrodynamic simulations. In agreement with previous work, we find that the fractional plasmon wavelength shift for polarization along the interparticle axis decays nearly exponentially with the interparticle gap. In addition, we find that the decay length is roughly about 0.2 in units of the particle size for different nanoparticle size, shape, metal type, or medium dielectric constant. The near-exponential distance decay and the interesting “universal” scaling behavior of interparticle plasmon coupling can be qualitatively explained on the basis of a dipolar-coupling model …
The Effect Of Plasmon Field On The Coherent Lattice Phonon Oscillation In Electron-Beam Fabricated Gold Nanoparticle Pairs, Wenyu Huang, Wei Qian, Prashant K. Jain, Mostafa El-Sayed
The Effect Of Plasmon Field On The Coherent Lattice Phonon Oscillation In Electron-Beam Fabricated Gold Nanoparticle Pairs, Wenyu Huang, Wei Qian, Prashant K. Jain, Mostafa El-Sayed
Wenyu Huang
By using electron beam lithography, we fabricated pairs of gold nanoparticles with varying interparticle separation. Double-beam femtosecond transient absorption spectroscopy was used to determine the coherent lattice oscillation frequency as a function of the interparticle separation in the presence of the plasmon field excited by the monitoring probe light. We found that the fractional shift in the coherent lattice phonon oscillation frequency follows an exponential decay with respect to the interparticle gap scaled by the disc diameter with the same decay constant as that previously observed for the fractional shift in the surface plasmon electronic oscillation resonance frequency. This strongly …