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Dive into the research topics where Mohammad Mahdi Salary is active.

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Featured researches published by Mohammad Mahdi Salary.


Journal of The Optical Society of America B-optical Physics | 2015

Robust technique for computation of scattering and absorption of light by array of nanowires on layered substrate

Mohammad Mahdi Salary; Mina Nazari; Hossein Mosallaei

In this study a robust semi-analytical technique based on the transition matrix approach is introduced for computation of scattering and absorption of light by periodic and aperiodic arrays of nanowires located on layered substrates. The formulation is developed for obliquely incident plane waves and then by means of suitable plane-wave decomposition, it is extended to Gaussian beams. The substrate contribution is taken into account through spectral reflection and transmission coefficients, which leads to computation of 2D Sommerfeld-type integrals. The major advantage of the proposed method is the rapid calculation in characterizing various types of large arrays (gratings) of nanowires on layered substrates. The analysis is applied to the grating of nanowires separated from a thick metallic film by a thin dielectric spacer. We investigate the influence of spacer-layer thickness and periodicity of arrays on the resonant behavior of structure. The study shows how, by engineering these parameters, the scattering properties can be tailored for specific applications. We demonstrate full-visible-range resonant light scattering by adjusting these parameters, which gives us control over color perception. Furthermore, in order to demonstrate the efficiency and capability of our model, we integrate the technique with genetic algorithm in an optimization procedure to design graded pattern meta-surfaces for focusing light and beam steering. The method will be of great advantage for designing various optical devices managed by nanowires, for both scattering and absorption.


IEEE Transactions on Antennas and Propagation | 2015

EM Scattering From Cylindrical Structures Coated by Materials With Inhomogeneity in Both Radial and Azimuthal Directions

Mohammad Kiani; Ali Abdolali; Mohammad Mahdi Salary

Consider a cylindrical structure with an arbitrary core coated by layers with inhomogeneity in both radial and azimuthal directions in the most general case. The core of the structure may be PEC, PMC, PEMC, impedance surface, dielectric, or metamaterial and an electromagnetic (EM) wave with arbitrary polarization is obliquely incident on the structure. In this paper, EM scattering from such a structure is analyzed, for the first time, through a general method in the frequency domain on the basis of the Taylor series concept. The validity of the proposed method is verified through some comprehensive examples. It is confirmed that the method is simple, fast, and highly reliable. Moreover, it is capable of analyzing the scattering of obliquely incident plane waves for all types of cylindrical cores and lossy inhomogeneous layers with continuous dielectric and magnetic profiles. In the last example, to show the applicability of the proposed method in inverse problems, the method is employed in an optimization procedure to reduce the radar cross section of a PEC cylinder.


Progress in Electromagnetics Research B | 2017

Electromagnetic Scattering from BI-Periodic Fabric Structures

Mohammad Mahdi Salary; Samad Jafar-Zanjani; Hossein Mosallaei

We develop an efficient semi-analytical technique to calculate the electromagnetic scattering from fabric structures modeled as crossed gratings of circular coated fibers of any material composition, arranged arbitrarily in yarns. The method relies on a matrix formulation based on multipole expansion for modeling conical scattering from uniaxial gratings of fibers, and employs a scattering matrix approach to obtain coand cross-polarized transmission and reflection coefficients. The lattice sums are evaluated using an efficient adaptive algorithm based on Shank’s transformation. The method can be employed for analyzing the scattering characteristics of fabric structures embedded in any arbitrary layered media. The validity of the method is verified through comparison with full-wave finite-difference time-domain simulations. A substantial performance gain is obtained, which makes the proposed method applicable to solve large-scale fabric structures.


Journal of Electromagnetic Waves and Applications | 2014

Analysis of scattering from cylindrical structures coated by radially inhomogeneous layer using Taylor’s series method

Mohammad Kiani; Ali Abdolali; Mohammad Mahdi Salary

Consider a cylindrical structure with an arbitrary core coated by a radially inhomogeneous layer in a general case. The core of the structure may be PEC, PMC, PEMC, impedance boundary, dielectric, or metamaterial. Contrary to the scattering problems of homogeneous media, scattering problems of inhomogeneous media do not have exact solutions except for special inhomogeneous profiles. In this paper, a general frequency domain method is proposed to analyze scattering from such structures on the basis of Taylor’s series concept for obliquely incident electromagnetic (EM) waves with arbitrary polarizations. The validity of the suggested method is verified by comparison with the exact solutions of some special profiles for the coating layer. Furthermore, a comparison is made between the proposed method and other commonly used methods in the literature, which confirms that the proposed method is general, fast, and has good convergence toward the solution. Moreover, as an application, we employed the method for optimization of the scattering echo width of a PEC cylinder.


Journal of The Optical Society of America B-optical Physics | 2018

Unidirectional thermal radiation from a SiC metasurface

Sandeep Inampudi; Jierong Cheng; Mohammad Mahdi Salary; Hossein Mosallaei

Emission of thermal radiation from periodically patterned surfaces that support surface phonon polaritons has always been into two symmetric emission angles. This is because of the nature of randomness in the thermal spectrum of a hot body that symmetrically distributes the heat into counterpropagating surface waves. Here we demonstrate the design method of metasurfaces with unconventional unit cell dimension and internal structure to direct the thermal radiation into a single specific emission angle. We utilize a combination of diffraction order engineering and numerical optimization techniques for the design process of an ultra-thin metasurface to couple counterpropagating surface waves into a single emission direction. In addition, we compute the near-field incoherent thermal emission intensity from the metasurface by combining the concepts of fluctuation dissipation theorem with solutions of Maxwell’s equations based on rigorous coupled-wave analysis and demonstrate unidirectional phaseless thermal radiation emission. The developed approach serves as a tool to design metasurfaces for manipulation of light sources with more complex nature than a plane wave.


Scientific Reports | 2017

Electrically Tunable Metamaterials Based on Multimaterial Nanowires Incorporating Transparent Conductive Oxides

Mohammad Mahdi Salary; Hossein Mosallaei

We present novel design approaches for metasurfaces and metamaterials with electrical tunability offering real-time manipulation of light and serving as multifunctional devices in near-infrared frequency regime (at the specific wavelength of 1.55 μm). For this purpose, we integrate indium-tin-oxide (ITO) as a tunable electro-optical material into multimaterial nanowires with metal-oxide-semiconductor and metal-insulator-metal configurations. In particular, an active metasurface operating in the transmission mode is designed which allows for modulation of the transmitted light phase over 280 degrees. This large phase modulation is afforded in the cost of low transmission efficiency. We demonstrate the use of such active metasurfaces for tunable bending and focusing in free-space. Moreover, we investigate the implementation of this material in deeply subwavelength multimaterial nanowires, which can yield strong variations in the effective refractive index by the virtue of internal homogenization enabling tunability of the performance in gradient refractive index metamaterials. In the theoretical modeling of these structures, we adopt a hierarchical multiscale approach by linking drift-diffusion transport model with the electromagnetic model which rigorously characterizes the electro-optical effects.


Journal of Applied Physics | 2015

A quasi-static continuum model describing interactions between plasmons and non-absorbing biomolecules

Mohammad Mahdi Salary; Hossein Mosallaei

Interactions between the plasmons of noble metal nanoparticles and non-absorbing biomolecules forms the basis of the plasmonic sensors, which have received much attention. Studying these interactions can help to exploit the full potentials of plasmonic sensors in quantification and analysis of biomolecules. Here, a quasi-static continuum model is adopted for this purpose. We present a boundary-element method for computing the optical response of plasmonic particles to the molecular binding events by solving the Poisson equation. The model represents biomolecules with their molecular surfaces, thus accurately accounting for the influence of exact binding conformations as well as structural differences between different proteins on the response of plasmonic nanoparticles. The linear systems arising in the method are solved iteratively with Krylov generalized minimum residual algorithm, and the acceleration is achieved by applying precorrected-Fast Fourier Transformation technique. We apply the developed met...


Progress in Electromagnetics Research B | 2014

Interaction of Electromagnetic Waves with a Moving Slab: Fundamental Dyadic Method

Atieh Kashaninejad Rad; Ali Abdolali; Mohammad Mahdi Salary

This paper concerns with the interaction of electromagnetic waves with a moving slab. Consider a homogeneous isotropic slab moving uniformly in an arbitrary direction surrounded by an isotropic medium (free space). In this paper a new simple and systematic method is proposed for analyzing re∞ection and transmission of obliquely incident electromagnetic waves by a moving slab based on the concept of propagators. In the previous works complex relations were arrived but using this novel method those complexities will not appear thus the method may be extended to more complex structures. In this method, flrst, electric and magnetic flelds are decomposed into their tangential and normal components then each constitutive dyadic is decomposed into a two-dimensional dyadic in transverse plane and two two-dimensional vectors in this plane. Substituting these dyadics into Maxwells equations gives a flrst order difierential equation which contains fundamental dyadic of the medium. From the solution of this equation, flelds inside the slab may be expressed in terms of flelds at the front surface of the slab and the propagator matrix which is an exponential function of fundamental dyadic. Using this method the up-going and down-going tangential electromagnetic flelds may be obtained at the same time. As a limiting case a slab with vanishing velocity is discussed using this method, and re∞ection and transmission coe-cients of this slab are derived, which ends in Fresnels equations. At last, several typical examples are provided to exemplify the applicability of the proposed method. Moreover, the results are compared with the method of Lorentz transformation. A good agreement is observed between the results which verifles the validity of the proposed method.


Progress in Electromagnetics Research M | 2013

AN EXACT FORMULATION FOR THE REFLECTION COEFFICIENT FROM ANISOTROPIC MULTILAYER STRUCTURES WITH ARBITRARY BACKING

Maryam Heidary; Ali Abdolali; Mohammad Mahdi Salary

This paper is concerned with the theory of wave propagation in biaxial anisotropic media. Consider a multilayered planar structure composed of media with electric and magnetic anisotropy, surrounded by two half spaces. Exat relations for re∞ection coe-cient from this structure can be useful for arriving at the intended applications. In this paper, by matching of transverse fleld components at the bounderies, we will arrive at exact recursive relations for re∞ection coe-cient of the structure. In the previous works, the magnetic and electric anisotropy were not taken into consideration at the same time, or complex relations were arrived. But using this novel method, those complexities will not appear and both electric and magnetic anisotropy are take into consideration. Moreover, we will not set any limits on the right half-space so the right most half- space may be a PEC, PMC, PEMC, surface impedance, dielectric or a metamaterial. Finally, the last section of the paper conflrms the validity of the relations arrived at and as an interesting application; the zero re∞ection condition will be obtained.


Progress in Electromagnetics Research M | 2013

A Duality Between Metamaterials and Conventional Materials in Multilayered Anisotropic Planar Structures

Maryam Heidary; Ali Abdolali; Mohammad Mahdi Salary; Hossein Mirzaei

Consider a plane wave incident on a multilayered anisotropic planar structure composed of conventional materials and metamaterials and surrounded by two half- spaces. In this paper, we aim to prove three theorems which indicate a kind of duality in these structures. Theorem 1: Assume that an arbitrarily polarized plane wave is obliquely incident on the structure. Now each layer is fllled with by dual media according to the interchanges DPS

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Mina Nazari

Northeastern University

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Shifei Tao

Northeastern University

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Kuan Zhang

Polytechnic University of Catalonia

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