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- Ac Stark effect (1)
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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Transmission Of Light In Nano-Hole Metamaterial, Shankaranandh Balakrishnan .
Transmission Of Light In Nano-Hole Metamaterial, Shankaranandh Balakrishnan .
Electronic Thesis and Dissertation Repository
The interaction of light with metallic nano-hole array structures enable excitation of surface plasmon polaritons at any angle of incidence. Nano-hole array structure can transmit more radiation than incident light due to the presence of surface plasmon polaritons. This phenomenon has opened up possibilities for a wide range of applications such as Surface Plasmon Resonance sensing and Surface Enhanced Raman spectroscopy. In this thesis, quantum scattering theory and quantum density matrix method are employed to assess optical transmission of metallic nano-hole array structures. The scattering cross section spectrum is calculated for nano-hole array structures with different nano-hole radii and periodicities …
Dielectric Spectroscopy Of Polyvinyl Alcohol Hydrogels And Nanocomposites, Nuwansiri N.K. Getangama
Dielectric Spectroscopy Of Polyvinyl Alcohol Hydrogels And Nanocomposites, Nuwansiri N.K. Getangama
Electronic Thesis and Dissertation Repository
Gels based on polyvinyl alcohol (PVA) can be formed by repeated freezing and thawing of a solution of the polymer. PVA cryogels have applications as biomaterials, including artificial tissue and drug delivery systems. The mechanical and electrical properties of polymeric materials can be changed significantly by adding a small amount of nanometer-sized particles. In this work, the dielectric properties of PVA solutions and gels were studied in the frequency range from 10 micro Hz to 1 MHz as a function of temperature, using a dielectric spectrometer. Comparison of the dielectric constant of a PVA solution to that of water indicates …
Ion Beam Modification Of Strontium Titanate And Highly Oriented Pyrolytic Graphite, Olga Lobacheva
Ion Beam Modification Of Strontium Titanate And Highly Oriented Pyrolytic Graphite, Olga Lobacheva
Electronic Thesis and Dissertation Repository
Doping and structural modification affects such important characteristics as conductivity, catalytic activity, luminescent and magnetic properties of modern materials. Ion beam implantation is a conventional doping method which combines a low processing temperature with convenient control of concentration and distribution of dopant and irradiation damage. In this study, the ion beam implantation method was used to modify strontium titanate (STO) and highly oriented pyrolytic graphite (HOPG). Both materials have immense potential for applications in different areas of modern technology, including gas sensing, catalysis, electronics and spintronics. Fe-implanted STO and N- and O-implanted HOPG were examined with complementary experimental techniques, including …
A Study Of Photon Trapping And The Ac Stark Effect In Photonic Crystals And Dispersive Materials, Iftekharul Haque
A Study Of Photon Trapping And The Ac Stark Effect In Photonic Crystals And Dispersive Materials, Iftekharul Haque
Electronic Thesis and Dissertation Repository
In this thesis, we study light-matter interaction in the contexts of coherent population trapping (CPT) and the ac Stark effect in nanoparticles embedded (doped) in two important classes of reservoirs -- photonic crystals and dispersive materials. These materials have gaps in their energy spectra and are studied widely due to their unusual optical properties and potential for novel applications. We consider that the reservoirs are doped with an ensemble of five-level nanoparticles, each with a single Λ core (consisting of a lower doublet and an upper energy level), which interact with both the host reservoir and external radiation fields. We …
Edge States And Quantum Hall Phases In Graphene, Pavlo Piatkovskyi
Edge States And Quantum Hall Phases In Graphene, Pavlo Piatkovskyi
Electronic Thesis and Dissertation Repository
The focus of this thesis is the dynamical symmetry breaking in monolayer and bilayer graphene in a magnetic field and the edge excitations in these systems. Due to the spin and valley degrees of freedom, the Coulomb interaction in graphene can lead to various broken-symmetry quantum Hall phases. The transport properties of each phase are affected by the low-energy edge excitations, and understanding the edge state properties can be crucial for identifying the true nature of the ground state. We study edge states in biased bilayer graphene in a magnetic field within the four-band continuum model. The analysis is done …