Hassan Talaat - Academia.edu (original) (raw)
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Washington University in St. Louis
Istituto Italiano di Tecnologia / Italian Institute of Technology
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Papers by Hassan Talaat
Superlattices and Microstructures, 2015
Applied Surface Science, 2015
ABSTRACT
Solid State Communications, 1992
ABSTRACT
Russian Journal of Physical Chemistry A, 2013
Russian Journal of Physical Chemistry A, 2009
Laser control and manipulation of reaction paths in molecular systems can lead to coherent contro... more Laser control and manipulation of reaction paths in molecular systems can lead to coherent control of the reaction path as a function of the absolute phase of an incident laser field through inclusion of dipole moments along the reaction path, thus leading to the potential surfaces ...
Zeitschrift für Physikalische Chemie, 2008
Laser ion-molecule reaction interaction through long range dipole moments leads to potential ener... more Laser ion-molecule reaction interaction through long range dipole moments leads to potential energy surface crossings. We will show here by using gauge representation (electric field gauge) for wave length λ = 20.6 μm, Intensity I = 5!1012 W.cm2, I = 1!1013 W.cm2, I = 3! ...
Applied Physics Letters, 2011
We report on surface-enhanced Raman scattering of silicon phonon vibrations from arrays of gold n... more We report on surface-enhanced Raman scattering of silicon phonon vibrations from arrays of gold nanoprism pairs fabricated by electron beam lithography. We found that resonant excitation of the quadrupolar surface plasmon mode of the nanoprisms increases Raman scattering intensity from the substrate as the distance between the nanoparticle pairs decreases. Finite element modeling and plasmon coupling theory indicate that symmetry is reduced as the nanoparticles approach, resulting in increased dipole-quadrupole coupling. Plasmonic enhancement of the incident and Raman-scattered photons results from the dipolar component of the mixed plasmonic field. This effect is expected to be largest in assemblies/aggregates of nanoparticles.
Superlattices and Microstructures, 2015
Applied Surface Science, 2015
ABSTRACT
Solid State Communications, 1992
ABSTRACT
Russian Journal of Physical Chemistry A, 2013
Russian Journal of Physical Chemistry A, 2009
Laser control and manipulation of reaction paths in molecular systems can lead to coherent contro... more Laser control and manipulation of reaction paths in molecular systems can lead to coherent control of the reaction path as a function of the absolute phase of an incident laser field through inclusion of dipole moments along the reaction path, thus leading to the potential surfaces ...
Zeitschrift für Physikalische Chemie, 2008
Laser ion-molecule reaction interaction through long range dipole moments leads to potential ener... more Laser ion-molecule reaction interaction through long range dipole moments leads to potential energy surface crossings. We will show here by using gauge representation (electric field gauge) for wave length λ = 20.6 μm, Intensity I = 5!1012 W.cm2, I = 1!1013 W.cm2, I = 3! ...
Applied Physics Letters, 2011
We report on surface-enhanced Raman scattering of silicon phonon vibrations from arrays of gold n... more We report on surface-enhanced Raman scattering of silicon phonon vibrations from arrays of gold nanoprism pairs fabricated by electron beam lithography. We found that resonant excitation of the quadrupolar surface plasmon mode of the nanoprisms increases Raman scattering intensity from the substrate as the distance between the nanoparticle pairs decreases. Finite element modeling and plasmon coupling theory indicate that symmetry is reduced as the nanoparticles approach, resulting in increased dipole-quadrupole coupling. Plasmonic enhancement of the incident and Raman-scattered photons results from the dipolar component of the mixed plasmonic field. This effect is expected to be largest in assemblies/aggregates of nanoparticles.