scispace - formally typeset
Search or ask a question
Author

Saeed Hasanpour Tadi

Bio: Saeed Hasanpour Tadi is an academic researcher from Shahid Beheshti University. The author has contributed to research in topics: Cloak & Gyration. The author has an hindex of 1, co-authored 3 publications receiving 3 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the electromagnetic detection of an ideal gyrating cloak, the effect of rotational speed on the electromagnetic wave interaction with a perfect non-inertial cloak was investigated.
Abstract: For the first time, electromagnetic wave interaction with a perfect non-inertial cloak is investigated. The electromagnetic detection of an ideal gyrating cloak, the effect of rotational speed on t...

4 citations

Journal ArticleDOI
TL;DR: Based on electromagnetic and acoustic transformation theory, a new strategy has been presented in this article to implement double invisibility cloaking, which has not been done yet, and does not generalize for any two classes of physics, electrical-mechanical, thermal-mechnical, Electrical-thermal, electromagnetic-sonic, etc.
Abstract: Based on electromagnetic and acoustic transformation theory, a new strategy has been presented in this article to implement double invisibility cloaking, which has not been done yet. By applying a ...

1 citations

Posted Content
TL;DR: In this paper, the impact of non-inertial effects, caused by rotational motion, on the cylindrical perfect cloak is simulated and the interactions between plane waves, Gaussian sine, and Gaussian pulse are investigated.
Abstract: In this study, the impact of non-inertial effects, caused by rotational motion, on the cylindrical perfect cloak is simulated. Also, the interactions between plane waves, Gaussian sine, and Gaussian pulse are investigated. it is shown that non-inertial perfect cloak could be detectable with the Sagnac and magnetoelectric this http URL low frequency of gyration, the distortion of waveform pattern is humble and negligible, however when the rotational frequency increases, the pattern distortion becomes huge and wavelets are formed and their intensity grows up. the scattering pattern can be influenced by the direction of rotation, thus, the direction of rotation could be identified with the scattering pattern analysis. Also, a method for measuring rotational velocity can be prepared concerning the electric field phase retardation. the simulation is computed using the FDTD methods by transforming the Maxwell's equations from non-inertial frameworks to the lab framework.

Cited by
More filters
01 Jun 2010
TL;DR: The effectiveness of the ground-plane invisibility cloak generated from quasiconformal mapping of electromagnetic space is examined, which shows that, for a bump with a maximum height of 0.2 units to be hidden, the lateral shift of a ray with 45° incidence is around 0.15 units.
Abstract: We examine the effectiveness of the ground-plane invisibility cloak generated from quasiconformal mapping of electromagnetic space. This cloak without anisotropy will generally lead to a lateral shift of the scattered wave, whose value is comparable to the height of the cloaked object, making the object detectable. This can be explained by the fact that the corresponding virtual space is thinner and wider than it should be. Ray tracing on a concrete model shows that, for a bump with a maximum height of 0.2 units to be hidden, the lateral shift of a ray with 45° incidence is around 0.15 units.

93 citations

01 Dec 2009
TL;DR: Based on the intrinsic asymmetry of coordinate transformation applied to motions of photons and charges, the authors proposed a method to detect this curved EM space by shooting a fast-moving charged particle through it.
Abstract: A perfect invisibility cloak is commonly believed to be undetectable from electromagnetic (EM) detection because it is equivalent to a curved but empty EM space created from coordinate transformation. Based on the intrinsic asymmetry of coordinate transformation applied to motions of photons and charges, we propose a method to detect this curved EM space by shooting a fast-moving charged particle through it. A broadband radiation generated in this process makes a cloak visible. Our method is the only known EM mechanism so far to detect an ideal perfect cloak (curved EM space) within its working band.

40 citations

Journal ArticleDOI
TL;DR: In this article , a concentric cylindrical cloak is proposed to achieve the acoustic cloaking phenomenon, which consists of MNE layers and water in MNE substrate in the MHz frequency range.
Abstract: A concentric cylindrical cloak is showed here to achieve the acoustic cloaking phenomenon. The introduced structure consists of MNE layers and water in MNE substrate in the MHz frequency range. Due to avoiding the incoming acoustic waves by the shell, the object can be hidden inside the cylindrical area of any shape. In order to improve the quality of cloaking, we have optimized the desired shell by considering the manufacturing technology. We show that an optimized, acoustic cloak based on composite lattice structure can reduce the scattering of an object more than a 20-layer realization of acoustic cloak based on multilayer cylindrical structure. This design approach can substantially simplify the fabrication of cloaking shells. In this research, to study the acoustic distribution of the desired structure, finite element method (FEM) has been used to analyze the structure in two dimensions and a cloak of natural materials with isotropic properties has been designed using effective medium theory.

1 citations

Journal ArticleDOI
TL;DR: In this paper , the authors proposed a universal impedance matching mechanism that realizes ∼100% energy transmission by double stages of quasi-arbitrary materials, and validated the proposed mechanism with acoustic waves based on finite element modeling and experimental characterization.
Abstract: In wave propagation between two media, a perfect impedance matching eliminates reflection and enables 100% energy transmission. Traditional matching mechanisms, with either single or multiple matching stages, require a specific impedance and dimension of each material, which is impossible to satisfy in many cases due to material unavailability or fabrication constraints. Consequently, many current systems are imperfectly matched with compromised performance. Here we show a universal impedance matching mechanism that realizes ∼100% energy transmission by double stages of quasi-arbitrary materials. The impedance of either matching material ranges from almost zero to almost infinity, as long as the impedance pair satisfies one of the four criteria. We validate the proposed mechanism with acoustic waves based on finite element modeling and experimental characterization. This work relaxes the requirement of matching materials and enables the universal matching of multiple waves with quasi-arbitrary materials.