Journal of Optoelectronical Nanostructures
Volume:3 Issue: 1, Winter 2017

Metal nanoparticles are widely researched for the fabrication of novel low cost and more energy efficient optoelectronic devices. Optical properties of metal nanoparticles are known to be different from their bulk counterparts. In this paper, with an appropriate modification of Drude model, I provide an improved dielectric function for gold nanoparticles which accounts for particle size as well as temperature effects. The model is consequently used to investigate Goos-Hanchen and Imbert-Fedorov reflection shifts of an oblique linearly polarized laser beam reflected from the nanoparticles in various temperatures. It is shown that the beam light can contribute both spatial and angular shifts depending on its state of polarity. The maximum shifts take place at grazing angles when the polarization of light is set at TM and 45°. Study of the light deviation's sensitivity to the temperature indicates that reflection shifts decrease linearly at higher temperatures except in angular out-of-plane shift Θ𝐼𝐹 . The trend is incremental for different nanoparticle size, keeping the distinct behavior of Θ𝐼𝐹 . Such results allow more accurate prediction of many optical phenomena involving nanoscaled gold and may serve as a delicate method to determine nanoparticle's size.

This paper investigates a novel design of penternary logic gates using carbon nanotube field effect transistors (CNTFETs). CNTFET is a suitable candidate for replacing MOSFET with some useful properties, such as the capability of having the desired threshold voltage by regulating the diameter of the nanotubes. Multiple-valued logic (MVL) such as ternary, quaternary, and penternary is a promising alternative to the binary logic design, because of less complexity, less computational step and reduced chip area. We propose two penternary inverters which are designed in the multiplevalued voltage mode based on CNTFET. In the first proposed design, the resistors are used to implement penternary logic whereas, in the second proposed design, they are replaced with the transistors. Extensive simulation results using HSPICE represent that the two proposed designs reduce significantly the power consumption and delay and sensitivity to process variations as compared to the state-of-the-art penternary logic circuit in the literature.

The aim of the present study was to evaluate the properties of linear and nonlinear optics of the Schiff base Salen. Crystal structure of nanoparticles was determined by a Bruker make diffractometer, Cu-K X-rays of wavelength (=1.5406 Å). The XRD patterns were recorded in the 2 range of 10–90o with a step width of 0.02 s-1. The UV-Vis Spectra recorded on a computerized double - beam Shimadzu 2550 spectrophotometer, using two matched 10.0 mm quartz cell. In this paper, refractive index, extinction coefficient and optical conductivity are calculated by using UV spectrum (Ultraviolet). Also, nonlinear optical property of matter and dielectric tensor are computed by using Gaussian software and based on density functional theory (DFT). The results showed that with decreasing of wavelength, the refractive index increase from 1.19 value to 2.64. This is due to the strong interaction between photons and conducting electrons. Also material was not asymptotic and has non-linear optical property, Also the triclinic structure for this material has been specified through dielectric tensor.

The communication security is set up by registration during the first belief and get in touch between two human beings. The safety codes among them are generated and the records are blocked by these protection codes if the end user is not the required one. On the other hand, the unlocked records are transmitted if the required end user is confirmed by the feedback brain signals via the comments mind indicators such as telepathic hyperlink. The specified safety codes are emerged and the records are transmitted. Furthermore, the quantum flip-flop alerts can also be generated by way of the usage of a coherent mild source propagates within micro-optical tool. The Rabi oscillation frequency can be set up to start/stop the transmission bits security. The circulation of information may be securely transmitted inside the telepathic communication. In this study by input Gaussian pulse into nano ring resonator (NRR), coding signal as.

Gallium nitride (GaN) nanostructures (NS) were synthesized using pulsed direct current plasma enhanced chemical vapor deposition (PDC-PECVD) on quartz substrate at low temperature (600°C). Gallium metal (Ga) and nitrogen (N) plasma were used as precursors. The morphology and structure of the grown GaN NS were characterized by field emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The XRD pattern shows that GaN NS were grown in the hexagonal wurtzite-type crystal structure. The optical properties of the grown GaN NS were examined by photoluminescence (PL), UVvisible and Raman spectroscopy. The PL spectroscopy measurements of the grown GaN NS showed blue shifts as compared to the GaN bulk structure. The Raman spectra displayed three Raman active optical phonons at 534 cm-1, 570 cm-1 and 730 cm-1 due to A1 (TO), E2 (high) and A1 (LO), respectively.

In this study the third order nonlinear susceptibilities are theoretically calculated for an electron confined in an isolated PbS/ CdSe/ CdS spherical core-shellshell quantum dots. Our calculation is associated with intersubband transitions in the conduction band. We used the effective mass approximation in this study which is a simple and straightforward study of the third-order optical nonlinearity in nanometersized parabolic quantum dots and solved a three-dimensional Schrӧdinger equation. The third order nonlinear susceptibilities are analyzed as function of core, shell radii. Our study show great dependence of third order nonlinear susceptibilities on size of core and shell. Also In the case of Kerr-type nonlinearities, nonlinear refractive index n2 and the nonlinear absorption coefficient β are investigated as function of the ratio k0/n0 (where 0 and k0 are the real and imaginary part of linear refractive index respectively) for different value of imaginary and real parts of the third order susceptibility.

In a dye-sensitized solar cell (DSSC), the amount of light absorption depends on the design of the pigments, which determines the strength of light absorption and the optical range of the cell. In this paper, we have constructed and studied two fairly similar pattern of DSSCs in structure. The thickness of TiO2 used for both cells is taken to be 2 μm. We have used an industrial N719 dye for one of the cells and a natural blackberry dye for the other. The N719 dye is the most common dye used in DSSCs. The results obtained from the I-V curve indicate a 700 mV open-circuit voltage (Voc), an 8.57 mA short-circuit current (Isc), a 70% fill factor (FF) and a 4.2% efficiency for the N719 sample. Blackberry is a natural dye which has no toxic effects in comparison with the industrial samples. The results obtained from the blackberry cell experiment indicate a 770 mV Voc, a 2.08 mA Isc, a 70% FF and a 1.13% efficiency.