Dr. Akbar Rahmani-Nejad Profile

Dr. Akbar Rahmani-Nejad

SPIE Involvement:

Author

Patents:
1. Semi-Cylindrical LED lamp PCT/IB2007/053915
2. Laser Light Landing System, National Patent No. 28066
3. Coherent Lamp, National Patent No. 28068
4. Porous Lens, National Patent No. 31561
5. Proximity Sensor, National Patent No. 28067
6. Hybrid Electric Machine PCT/IB2018/055217
The proximity sensor has been operating for 17 years in Shiraz Airport Radar (Raytheon Approach radar) Site.

Proceedings Article | 21 October 2021 Poster + Presentation + Paper

An anti-hypersonic missiles hybrid optical and enhanced railgun system

A. Rahmani-Nejad

Proceedings Volume 11869, 118690N (2021) https://doi.org/10.1117/12.2599282

KEYWORDS: Missiles, Magnetic weapons, Phased arrays, Magnetism, Sensors, Phased array optics, Ferromagnetics, Electromagnetism, Defense systems, Weapons

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Proceedings Article | 8 November 2020 Presentation + Paper

Two entangled electrons (photons) microscopy

Akbar Rahmani Nejad, Ali Rahmani Nejad

Proceedings Volume 11525, 115250G (2020) https://doi.org/10.1117/12.2581761

KEYWORDS: Electrons, Photons, Microscopy, Brain, Neuroimaging, Entangled states, 3D image processing

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Proceedings Article | 8 November 2020 Poster + Presentation + Paper

Several innovative methods to generate optical clock pulses by optical fiber coupler and optical saturable absorber

Akbar Rahmani Nejad, Ahmad Rahmani Nejad

Proceedings Volume 11525, 115252H (2020) https://doi.org/10.1117/12.2582458

KEYWORDS: Optical fibers, Optical clocks, Picosecond phenomena, Ultrafast phenomena, Optical amplifiers, Fiber amplifiers, Clocks

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Proceedings Article | 8 November 2020 Paper

Post communication data transmission by entangled photons having high data security

Akbar Rahmani Nejad, Ahmad Rahmani Nejad

Proceedings Volume 11525, 115252G (2020) https://doi.org/10.1117/12.2581766

KEYWORDS: Photons, Data communications, Receivers, Transmitters, Polarization, Computer security, Data transmission, Optical communications, Fiber optic communications, Spin polarization

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Proceedings Article | 5 October 2020 Presentation + Paper

Post communication data transmission by entangled photons having high data security

Akbar Rahmani Nejad, Ahmad Rahmani Nejad

Proceedings Volume 11579, 115790F (2020) https://doi.org/10.1117/12.2582430

KEYWORDS: Photons, Data communications, Receivers, Transmitters, Polarization, Computer security, Data transmission, Optical communications, Fiber optic communications, Spin polarization

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Proceedings Article | 21 August 2020 Presentation + Paper

Are there any photons in the dark fringes of double slit experiment?

A. Rahmani Nejad, P. Rahmani Nejad

Proceedings Volume 11481, 114810A (2020) https://doi.org/10.1117/12.2565899

KEYWORDS: Photons, Particles, Fourier transforms, Diffraction, Mathematical modeling, Waveguides, Destructive interference, Single photon, Sensors

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Proceedings Article | 20 August 2020 Poster + Paper

Incorporating chirped tilted piezoelectric superlattice inside thermoelectric modules and comparison with photovoltaic cells for space applications

Akbar Rahmani Nejad, Ahmad Rahmani Nejad

Proceedings Volume 11496, 114960N (2020) https://doi.org/10.1117/12.2569926

KEYWORDS: Thermoelectric materials, Phonons, Superlattices, Reflectors, Crystals, Zinc oxide, Solar cells, Scattering, Reflection

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Proceedings Article | 10 September 2009 Paper

A quantum-mathematical model to state single photon (electron) double slit experiment, Fraunhofer and Fresnel diffractions

Akbar Rahmani Nejad, M. Olia

Proceedings Volume 7421, 742117 (2009) https://doi.org/10.1117/12.823571

KEYWORDS: Diffraction, Particles, Single photon, Near field diffraction, Far-field diffraction, Mathematical modeling, Quantum mechanics, MATLAB, Geometrical optics, Light

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Proceedings Article | 10 September 2009 Paper

A new approach for solution of the paradox of electron spin

Akbar Rahmani Nejad, M. Olia

Proceedings Volume 7421, 742116 (2009) https://doi.org/10.1117/12.823431

KEYWORDS: Photons, Particles, Scattering, Mathematical modeling, Chromium, Mathematics, Compton scattering, Special relativity, Light scattering, Relativity

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In this paper it is tried to provide a new approach to the problem of electron spin by reviewing the classical concept of spin. It is exhibited that the big flaw in calculation of electron spin by classical concept and formulation is due to intrinsic errors associated with any experiment to measure the amount of the radius of electron, i.e. the measured amount of electron radius in any lab experiment will be much smaller than expected value and is varied depending on some factors, the nature and the conditions that govern each experiment. It is tried to provide a mathematical analysis and physical model to show that any change in kinetic energy of electron will change the rotational speed of electron slightly. It is obvious that the rotational speed of electron should be very close to the light speed then any change of above mentioned speed will result a great change in the radius of electron (Ehrenfest paradox) and measured mass of electron in any specific experiment. In other words a small change of rotational speed due to the change of kinetic energy of scattered particles in each experiment will result different values of measured radius of electron depending on the conditions that govern any specific any experiment but it is showed that spin of electron remains fix in all experiments. This phenomenon can be called relativistic asymptotic behavior. Most of lab experiments for calculation the radius of electron are scattering of electron-particle , then any change of kinetic energy of electron will change the rotational speed considerably .The concept of rest mass, contracted length and Ehrenfest paradox, are used to investigate the spin concept by a novel method. A very direct consequence that can not be avoided to be mentioned is an interpretation to the concept of anti-neutron that is mentioned in this paper too. It is also exhibited that the mathematical analysis of Compton effect can be a strong proof for this model. As the following, the concept of proton spin and neutron spin is analyzed precisely. Finally, a precise value for Planck constant is obtained according to the above mentioned model that can be a confirmation to the provided mathematical analysis and modeling.

Proceedings Article | 1 September 2009 Paper

Theory, design, and micron-scale implementation of fully optical logic gates and optical clock circuits

Akbar Rahmani Nejad

Proceedings Volume 7442, 744218 (2009) https://doi.org/10.1117/12.826809

KEYWORDS: Fiber optics, Optical logic, Femtosecond phenomena, Optical fibers, Laser optics, Logic, Fiber lasers, Attenuators, Beam splitters, Semiconductors

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In this paper, it is tried to provide an innovative method to overcome several limitations of state of the art of logical gates and microprocessors, by implementation of micron-scaled optical gates. This technology can overcome such limitations, i.e. processing speed, heat dissipation, electromagnetic radiation and electrical noise immunity. This technology can be fully or partially feasible by substitution of common semiconductor technology with optical logic gates. By implementation of micron-scale optical fiber, optical couplers, fiber optical amplifiers, or fiber lasers, optical attenuators, optical fiber brag grating, femto-second optical lasers, and implementation of fundamental properties of optical coherent light, e.g. superposition, interference, phase delay, etc, it is possible to fabricate micron-scale universal logical gates, i.e. optical NAND gates, optical NOR gates, optical Exclusive-OR, optical exclusive-NOR gates and subsequently fabrication of sequential circuits (optical flip-flops), that all are fundamental blocks of microprocessors. Optical coherent light is produced by femtosecond lasers and is supplied to a network of micron-scaled fiber optics, fiber optical lasers, attenuators, fiber optical couplers, and finally are supplied to opto-couplers that change optical signals to electrical signals to be read by output console or to be written on memory cells. It is also possible to implement a combination of optical and semiconductor gates to decrease above mentioned limitations. The method of fabrication of optical gates is discussed in details and all necessary logical and technical aspects are provided too. The fundamental implemented aspect is superposition of coherent lights in fiber optic couplers. By implementation of femtosecond laser pulses, it is possible to reach to much higher frequencies of about hundreds to thousands of terahertz. Alternative optical method is provided here, e.g. implementation of fiber loops as clock circuit or even as an optical oscillator. By implementation of this technology, there will be one hundred years advance in respect to state of the art technology.

Proceedings Article | 21 August 2009 Paper

Design of an innovative gamma ray spectroscopy image-based telescope by assigning reciprocal vision color to each gamma photon depending on the energy of gamma photons

Akbar Rahmani Nejad, M. A. Olia

Proceedings Volume 7435, 74350O (2009) https://doi.org/10.1117/12.823569

KEYWORDS: Fusion energy, Sensors, Space telescopes, Sun, Stars, Spatial resolution, Telescopes, Spectroscopy, Gamma radiation, Photodetectors

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In this paper an innovative method to devise a new astronomical observation instrument by simultaneous implementation of a gamma telescope and a gamma spectroscope is presented. Electromagnetic beams emitted from a star e.g. the sun is spread all electromagnetic spectrum from gamma rays to radio waves, but there is a fingerprint in such a wide spectrum that shows the exact fusion reaction which can be traced by associated gamma photons. This means if gamma photons, emitted from each part of sun, to be detected by this instrument, then spatial information is provided by telescope and information about the energy is recorded by spectrometer, by convolving two above mentioned data, there will be an illustration of a star like the sun that can show which area emits associated gamma photons that in turn illustrates the spatial distribution of elements that produce these gamma photons e.g. hydrogen, deuterium, tritium, helium, etc. we choose a reference color for each principle gamma photon, according to method similar to gamut color space of CIE [1], by specific linear transformation, or transformation matrix having photon-energy dependence coefficients, then there will be a colorful illustration of sun or any star (or even a GRB) that depicts distribution of elements, released energy, density of elements, etc. This information in turn will reveal the rate and topological variation of matter, energy, magnetic fields, etc. This information will also help to provide enough data to find spatial distribution function of energy, matter, variation and displacement of matters on stars and in turn, it will provide unique information about behaviors of stars. Finally, the method of vibrating holes to increase the spatial resolution of gamma detectors to hundreds times is presented. This method increases the spatial resolution of semiconductor-gamma telescopes to hundreds of times without decreasing the size of gamma sensor pixels and without any major effort to improve the technology of semiconductor sensors by a method that can be called "spatial resolution versus temporal resolution".

Proceedings Article | 26 November 2007 Paper

A quantum-mathematical model to state single photon (electron) double slit experiment, Fraunhofer and Fresnel diffractions

Akbar Rahmani Nejad

Proceedings Volume 6827, 68270J (2007) https://doi.org/10.1117/12.753704

KEYWORDS: Diffraction, Particles, Single photon, Near field diffraction, Far-field diffraction, Quantum mechanics, Mathematical modeling, MATLAB, Geometrical optics, Light

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