Showing 3 results for Soltanian
Masoud Mardani, Mehrdad Mehrani, Mehrdad Soltanian,
year 20, Issue 0 (1-2014)
Abstract
Abstract-in this research an accurate 2.7" to 1" optical converter is designed. In this converter plane wave-front with 2.7" diameter enters and plane wave-front with 1" diameter exits. This converter in combination with inverse 4" to 6" converter converts 4" plane wave-front to 1" plane wave-front. This 4 times reduction in diameter, increase surface intensity of wave-front, by a factor of 16. Making use of this increase in surface intensity, we can measure 90 degree angle error in micro prisms.
Masoud Mardani, Omid Saadatmand, Meysam Ashtari, Somaye Khalili, Mehrdad Soltanian,
year 20, Issue 0 (1-2014)
Abstract
Abstract-in this research an accurate method for adjustment of tilt and de-center in an optical system is presented. In this method exit spherical wave-front of and autocollimator and objective is used. De-center and tilt of each lens are adjusted through reflecting spherical wave-front from the front surface and back surface of each lens, respectively. Adjustment of de-center and tilt for all lenses is performed while the performance of system is enhanced considerably.
Emadreza Soltanian, Kambiz Abedi,
year 24, Issue 0 (3-2018)
Abstract
In this paper, the use of copper rods in silicon 2D based photonic crystal filter for 1.5 um communication to enhance transmission coefficient was investigated. To simulate the optical behavior of the filter, 2D-FDTD is used. Simulations have shown that the replacement of copper rods instead of silicon rods between the input waveguide and resonator and also between the output waveguide and resonator, leads to better coupling between them. Thus, by means of this technique, transmission coefficient and quality factor of the filter at the resonance frequency of 199.93 Terahertz can reach 0.996 and 190, respectively. Because of CMOS compatibility, small size and high transmission efficiency, this narrow band filter is suitable for future long distance communication.
