What do i do?
My Mission
My research interests are mainly regarding theoretical physics, computer simulations and modelling of real world experiments, and post-processing and data analysis that allows us to better understand the world and how scientific advances can be used to benefit society.
Plasmonic Hot electron generation
In metallic nanostructures, plasmons are absorbed via two processes of interband and intraband transitions. Plasmons are collective oscillations of surface electrons as a result of the light-matter interaction. These oscillations finally decay through electron-electron interactions and electron-phonon scattering. The former decay relaxation time regarding hot electrons is on the order of a few hundred femtoseconds, and the latter decay timescale is on the order of a few picoseconds. In this research, we study novel nanostructures capable of producing ultrafast pulses of hot (energetic) plasmonic electrons. This approach can be used in di erent areas of technology where there is a need for generation of highly energetic and fast electrons such as solar surface chemistry, photocatalysis, and photodetectors.
Thermal Properties of Nanosystems
Heat dissipation and temperature distribution is another essential aspect of
nano-systems. Metallic nanoparticles (NPs) and nano-engineered materials have recently been used for interesting properties such as ensemble heat localization, bio-sensing, Fano resonance, photo chemistry and energy harvesting. Our eff ort to theoretically and numerically understand heat dissipation and temperature distribution resulted in design of nano assemblies to make energy efficient hot spots, water heating contributing to perform selective chemistry at the nanoscale, thermal imaging for ensemble of nanoparticles, and …
Chirality and circular dichroism (CD)
In general, the chirality of a medium can reveal some important physical, chemical, and structural properties. CD spectroscopy is the method to observe these properties in an
efficient and fast manner. In simple words, CD spectroscopy is the difference between the responses of a medium under to the Left and Right Cicularly Polarized (LCP/RCP) light. The CD spectrum of biomolecules is generally weak and is not in the visible range of electromagnetic spectrum. Chiral Metallic NPs have their plasmonic resonance generally in the visible range. These NPs can be fabricated as standalone organizations or can be integrated with biomolecules to be used for much stronger CD signals and visible CD spectroscopy.
Metamaterials
Metamaterials are one of the essential and growing areas of research resulting from plasmonics science. Metamaterials are materials by design. One can engineer materials with specific geometries and compositions to achieve desired optical properties which do not exist naturally, such as a negative index of refraction, cloaking, perfect lenses, and much more. These technologically pertinent and applicable optical functions have recently become possible to construct or at least potentially manageable at the micro and nanoscale. In this area, we utilize different geometries of metamaterials to achieve high performance hot electron generators, cloacking devices, chiral biomolecule detectors, and …
Chiral dielectric media
Chiral dielectric media possess their chirality based on their composition not their geometry. In this research, we aim at theoretical understanding of the underlying physics of these structures. We model arbitrary shaped chiral dielectric media to find out novel properties which can be combined with plasmonic materials. We showed recently that this property can be used for protein orientations which has pharmaceutical applications.
Laser functionalized surfaces
Femtosecond Laser Surface Processing (FLSP) has become a popular method for generating multiscale self-organized quasiperiodic nanostructures owing to the excellent repeatability, permanency, low-cost fabrication, precise surface topography, and flexibility. In this research, we aim at modeling full-wave electromagnetic simulation of the FLSP method by including complex physics of the interaction of laser with different materials.