Publications by authors named "Morteza Hajimahmoodzadeh"
Article Synopsis
- Singularities in optical wavefronts can lead to degraded performance in adaptive optics due to turbulence effects, making their detection crucial.
- The gradient of the wavefront phase is split into rotational and irrotational components, with singularities represented as peaks and valleys in the phase gradient's potential using a Helmholtz-Hodge decomposition.
- This article explores a method called branch point potential (BPP) for detecting phase singularities, where the irrotational part is eliminated to emphasize the singularities and improve detection performance, even in noisy conditions.
We investigate the determination of nonlinear refractive index n(2), based on solving the transport of intensity equation (TIE) in conjunction with a pump-probe technique. As the pump and probe beams propagate through a sample, the pump-induced refractive index variations in the sample change the phase distribution of the probe beam. Using two recorded probe intensities in TIE, this phase change is derived, and so the nonlinear refractive index n(2) is obtained.
View Article and Find Full Text PDFArticle Synopsis
- Developed an iterative method to reconstruct two unknown interfering wavefronts using both numerical simulations and experiments.
- Analyzed a 3D interference pattern to effectively separate and identify the wavefronts involved.
- Utilized Zernike polynomials and a stochastic parallel gradient descent algorithm for wavefront expansion and calculations.
Article Synopsis
- The paper focuses on designing and simulating conductive nanometric multilayer systems, specifically optimizing the thickness of Ag and ZnS layers for high transmittance and low sheet resistance.
- The ZnS/Ag/ZnS/Ag/ZnS (ZAZAZ) multilayer systems are created using a thermal evaporation method on glass substrates at room temperature.
- The ZAZAZ system achieves a sheet resistance of 2.7 Ω/sq and an optical transmittance of ~75.5%, and OLEDs built on this anode perform similarly to those using traditional indium-tin oxide anodes.