Optical properties nanostructures

Surface-enhanced Raman scattering detected temperature programmed desorption optical properties, nanostructure, and stability of silver film over SiO2 nanosphere. Journal of Physical Chemistry B, 105, 6907-6915. 

Keywords a -Conjugation Barcode Biosensor Doping Electron beam Hybridization Hydrothermal Light-emitting polymer Nanoscale optical property Nanostructure Optoelectronics... 

Measurements of the optical properties in this range of wavelengths can probe the fundamental electronic transitions in these nanostructures. Some of the aforementioned effects have in fact been experimentally revealed in this series of experiments (90). As mentioned above, the IF nanoparticles in this study were prepared by a careful sulfidization of oxide nanoparticles. Briefly, the reaction starts on the surface of the oxide nanoparticle and proceeds inward, and hence the number of closed (fullerene-like) sulfide layers can be controlled quite accurately during the reaction. Also, the deeper the sulfide layer in the nanoparticle, the smaller is its radius and the larger is the strain in the nanostructure. Once available in sufficient quantities, the absorption spectra of thin films of the fullerene-like particles and nanotubes were measured at various temperatures (4-300 K). The excitonic nature of the absorption of the nanoparticles was established, which is a manifestation of the semiconducting nature of the material. Furthermore, a clear red shift in the ex-citon energy, which increased with the number of sulfide layers of the nanoparticles, was also observed (see Fig. 21). The temperature dependence of the exciton... 

When the size of metals is comparable or smaller than the electron mean free path, for example in metal nanoparticles, then the motion of electrons becomes limited by the size of the nanoparticle and interactions are expected to be mostly with the surface. This gives rise to surface plasmon resonance effects, in which the optical properties are determined by the collective oscillation of conduction electrons resulting from the interaction with light. Plasmonic metal nanoparticles and nanostructures are known to absorb light strongly, but they typically are not or only weakly luminescent [22-24]. 

Shcheslavskiy, V., Saltiel, S., Ivanov, D. A., Ivanov, A. A., Petrussevich, V. Y., Petrov, G. I., and Yakovlev, V. V. 2006b. Nonlinear optics of molecular nanostructures in solution Assessment of the size and nonlinear optical properties. Chem. Phys. Lett. 429 294-98. 

Murphy CJ, Sau TK, Gole A, Orendorff CJ (2005) Surfactant-directed synthesis and optical properties of one-dimensional plasmonic metallic nanostructures. MRS Bull 30 349-355... 

This section considers two aspects of the interaction of light with nanostructures— differences from the optical properties of bulk solids that arise because of the different energy levels of nanostructures and changes in scattering properties. 

One important question is not addressed by the current theory whether monodispersed nanostructures this small (isolated or ordered, non-interacting or coupled), fabricated from the components of bulk semiconductors are likely to be interesting candidates as NLO materials. In order to advance current theories on linear and non-linear optical properties of semiconductor nanostructures, suitable materials must be made available. 

Engineering Quantum Confined Silicon Nanostructures Ab-Initio Study of the Structural, Electronic and Optical Properties... 

In this paper we present a comprehensive first-principles study of the structural, electronic and optical properties of undoped and doped Si nanosystems. The aim is to investigate, in a systematic way, their structural, electronic and stability properties as a function of dimensionality and size, as well as pointing out the main changes induced by the nanostructure excitation. A comparison between the results obtained using different Density Functional Theory based methods will be presented. We will report results concerning two-dimensional, one-dimensional and zero-dimensional systems. In particular the absorption and emission spectra and the effects induced by the creation of an electron-hole pair are calculated and discussed in detail, including many-body effects. 

Electronic and optical properties of complex systems are now accessible thanks to the impressive development of theoretical approaches and of computer power. Surfaces, nanostructures, and even biological systems can now be studied within ab-initio methods [53,54]. In principle within the Born-Oppenheimer approximation to decouple the ionic and electronic dynamics, the equation that governs the physics of all those systems is the many-body equation ... 

In the last decade there has been considerable and reasonably satisfactory progress in the understanding of the theoretical aspects of the structural, electronic and optical properties of Si nanostructures. Here we have presented the outcomes of our theoretical study of the properties of Si nanosystems, considering Si nanodots, Si nanowires and Si nanoslabs. We have demonstrated, by first-principle calculations, also beyond the single particle approach, that the structural, electronic, and optical properties of the... 

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