Influence of nanoparticle shape on colloidal plasmonic interface properties

Sarıgül, Elif
Nanoparticles bearing free charges, interact very strongly with incoming electromagnetic radiation at certain frequencies called the plasmon resonance frequencies, depending on the size, shape and material properties of the particle and the medium. In order to enhance the light scattering by a two dimensional network of such plasmonic nanoparticles several strategies can be followed. In this thesis, it was pursued the fabrication and characterization of the nanoparticle decorated surfaces by colloidal solution based technique as a self-organized random production method. Optical and spectral electrical properties of plasmonic interfaces were investigated for nanosphere, nanowire and nanobipyramid particles to find out the most efficient geometry. It was also discussed the feasibility of the application of metal nanoparticles to solar cell devices.


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Aydın Çivi, Hatice Özlem; Pathak, PH (2004-06-26)
The presence of surface waves different from the conventional grounded dielectric substrate surface wave modes, which can be excited on a finite periodic radiating array of printed dipoles, at frequencies for which the spacing between dipoles is typically less than half a wavelength is studied. The effects of such array guided surface waves on the array radiation characteristics are investigated. Techniques to suppress these surface waves are also discussed.
Enhancement of plasmonic nonlinear conversion and polarization lifetime via fano resonances
Yıldız Karakul, Bilge Can; Bek, Alpan; Taşgın, Mehmet Emre; Department of Physics (2017)
Boundary conditions and dispersion at dielectric-conductor interfaces, together, results in bands of energies or wavelengths of light within which light-matter interaction strength displays peaks as a result of fulfilled resonance conditions. At these resonance energies light propagation is strongly coupled to collective oscillation of free charges at the dielectric-conductor interface which qualifies to be given a quasiparticle name, "the surface plasmon polariton" (SPP). When dealing with zero-dimensional...
Theory and applications of surface plasmon resonance sensors
Özdemircan, Furkan; Sayan, Gönül; Department of Electrical and Electronics Engineering (2021-2-12)
In this thesis, the electromagnetic theory of the surface plasmon resonance (SPR) phenomenon and its applications in optical sensing are investigated. An SPR sensor's operation is based on the excitation of surface plasmon waves (SPWs) at an interface between two different media, a metal layer, and a dielectric layer, with real parts of dielectric constants having opposite signs. The presence of the SPR shows itself with a sharp minimum in the reflection curve of the sensor that is operated by either the an...
Effects of surface potential fluctuations on DLTS of MOS structure
Ozder, S; Atilgan, I; Katircioglu, B (1996-02-01)
Although the conventional large signal deep-level transient spectroscopy (DLTS) technique is immune to surface potential fluctuations resulting from interface charge inhomogeneities in a MOS structure, in energy resolved, small signal DLTS, the eventual surface potential fluctuation should be considered. In this paper, the effect of the potential fluctuation on the temperature-scan DLTS signal for a given gate bias has been carried out. In fact, this effect shifts the DLTS peak position to lower temperature...
Influence of photonic excitations on the electrical parameters of TlInS2 crystals
QASRAWI, ATEF FAYEZ HASAN; Hasanlı, Nızamı (Wiley, 2010-04-01)
The photo-excitation effect on the current transport mechanism in TlInS2 crystals has been studied by means of dark and illuminated conductivity measurements. The temperature-dependent electrical conductivity analysis in the temperature region of 110-340 K revealed the domination of the thermionic emission and the thermally assisted variable range hopping (VRH) of charge carriers above and below 160 K, respectively. Above 160 K, the conductivity activation energies in the dark are found to be 0.28 and 0.15 ...
Citation Formats
E. Sarıgül, “Influence of nanoparticle shape on colloidal plasmonic interface properties,” M.S. - Master of Science, Middle East Technical University, 2014.