Showing 5 results for Penetration Depth
Ziba Dini Torkamani, Hamid Gholami, Sare Ghahari Korani, Hamidreza Shirvani Mahdavi, Zahra Shourshieni,
year 20, Issue 0 (1-2014)
Abstract
The concentration of constituent elements of an alloy including gold, silver and copper is compared before and after correction of self-absorption using calibration-free LIBS method. In this method, by selecting two lines for each species, the optical penetration depth is calculated for the lines. Then, the intensity of emission lines, and therefrom the plasma temperature is going to be optimal. Therefore, the concentration of elements is obtained more accurately.
Zahra Shabanpour, Hosein Eshghi,
year 21, Issue 0 (3-2015)
Abstract
Nickel oxide (NiO) thin films are deposited on glass substrate by spray pyrolysis method with various precursor volumes of 50, 75 and 100 ml. The FESEM images are indicated the formation of nano-metric structures, and the structural characterizations using XRD spectra showed the formations of cubic polycrystalline structures in the layers with (111) as the preferred direction. The optical characterizations also revealed that the optical band gaps of the layers are decreased from ~3.6 to 3.4 eV with the increment of the precursor volume, also the absorption coefficients of the layers in UV-range are about 105 cm-1. The data analysis showed that the sample prepared with 100 ml precursor volume has the lowest penetration depth (less than 200 nm) in the UV-range.
Mrs. Shabbo Saedi, Dr. Abdollah Hassanzade,
year 21, Issue 0 (3-2015)
Abstract
- Waveguide evanescent field fluorescence microscope can be used to image cell – waveguide contact regions. When a cell is attached to and spread on a waveguide surface, the cover region becomes a multilayer and is not a simple single – layer region any more. In this paper, the electromagnetic theory of guided waves in a planar waveguides with a multilayer cover region, which is a model for an attached cell, is investigated. Quantifies such as the excited fluorescence, background fluorescence and the distance of the cell from waveguide surface are analyzed.
Yadallah Mirzaei, Maryam Seyyedi, Tohid Abedi Jeryan, Ali Rostami, Ghassem Rostami,
year 22, Issue 0 (2-2016)
Abstract
This study investigated the effect of temperature in the waveguide with composite cladding and revealed that not only the temperature increase in composite cladding with pure dielectric core can make changes in the optical constants of metal nano-particles, but also it can change the penetration depth, propagation length, distribution field and the intensity of propagated light. The results of simulation showed that the propagation length, the intensity of propagation light and penetration depth will decrease by the increase in the temperature. Also, the distribution field showed significant changes. By the modal analysis of the waveguide with composite cladding, it was proved that the fundamental mode experience the highest thermal changes compared to the first and higher order modes in the propagation features. It is noteworthy that simulation has been conducted by MATLAB software.
Ladan Sheykh Hosseinpour, Mahdi Hosseini, Mahdi Bahadoran,
year 25, Issue 0 (3-2019)
Abstract
In this paper, the effect of temperature on THz radiation in superconductors media is investigated. Electromagnetic equations for vortices have been solved and the radiated power versus superconductors parameters is calculated. Results show that radiated power is slightly dependent on temperature for those much lower than critical temperature (Tc), but an effect of temperature is significant near Tc. The results also reveal that the peak of radiated power gets its maximum just before Tc and then decreases sharply.
