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Flat mirror for millimeter-wave and terahertz imaging systems using an inexpensive metasurface

Chinese Optics Letters 2017年第1期15卷 75-79页

作者： Gil Litmanovitch David Rrotshild amir abramovich Department of Electrical and Electronic Engineering Ariel UniversityArielIsrael

Flat mirrors, also known as flat parabolic surfaces, for millimeter-wave and terahertz imaging systems are demonstrated. This flat mirror is based on the metasurface in which an inexpensive printed circuit board technology is used to realize copper patterns printed on an FR4 substrate. Compared to the conventional reflector antennas used today in diverse applications （for homeland security, medical systems, communication, etc.）, the suggested mirror has major advantages in process simplicity, mechanical flexibility, frequency alignment, weight, and cost. The theoretical background, simulation results, experimental results, and proof of concept are given in this Letter.

关键词： Terahertz imaging Metamaterials Mirrors Surfaces

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Diagnostic and Analysis of Human Sperm Characteristics Using Fourier Transform Infrared Spectroscopy

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Open Journal of Urology 2015年第6期5卷 97-101页

作者： amir abramovich Alexander Shulzinger Department of Electrical and Electronic Engineering Ariel University Ariel Israel

A spectroscopic method for human sperm evaluation and characterization using Fourier Transform Infra Red (FTIR) is presented. The high sensitivity of FTIR to changes in chemical structure and arrangement of molecules and proteins makes it a powerful diagnostic tool. Our experimental results show that a simple MIR (400 cm-1?- 4000 cm-1) transmission spectrum of a human sperm is very fast and can be used to determine the level of structure, compare to conventional LAB tests. No sample preparations are required, the semen has to be put on a special ZnSe substrate and inserted into the measurement compartment of the FTIR. Furthermore, this method can distinguish between immature sperm cell to white blood cell which by using a microscope is difficult and re-quires experience.

关键词： Human Sperm FTIR Spectroscopic Measurements

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Metal Nano Layer Coating for Improving the Detection and Recognition of Micro-Poisons Using Reflection Spectroscopic Measurement

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Optics and Photonics Journal 2015年第5期5卷 193-199页

作者： amir abramovich Alexander Shulzinger Meir Ochana David Rotshild Department of Electrical and Electronic Engineering Ariel University Ariel Israel

Metal nano layer coating for increasing the sensitivity of spectroscopic measurements is proposed and experimentally demonstrated in this paper. The metal nano layer will attract the micro-poisons from any measured aqueous sample increasing the concentration of the micro-poison in the vicinity of the surface and significantly improves the sensitivity of the spectroscopic measurement. The demonstration was carried out using Fourier Transform Infra-Red (FTIR) operating in the MIR 400 cm-1 - 4000 cm-1 and 5 nm Gold layer which was grown on silicon oxide substrate. In the experimental demonstration Malathion organophosphate pesticide was used as micro-poison. The spectroscopic measurement proves that Malathion was attracted to the metal nano layer. Furthermore, the absorption lines of Malathion were detected and recognized. This proof of principle can be applied to any Internal Reflection Elements (IRE) and it can be used to purify any aqueous solutions and atmosphere from micro-poisons which will be attracted to the metal Nano layer.

关键词： FTIR Spectroscopy Internal Reflection Element (IRE) Metal Nano Layer Coating Detection of Micro-Poisons Organophosphates

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Millimeter Wave Reconfigurable Metasurface Intelligent Reflecting Surface Based on Piezoelectric Crystal for 5^th and 6^th Generation of Wireless Communication

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Communications and Network 2022年第4期14卷 109-118页

作者： Asaf Barom Efi Rahamim Daniel Rozban David Rotshild amir abramovich Department of Electrical and Electronic Engineering Ariel University Ariel Israel

The new requirements from the 5th and the 6th generation of wireless communication are ultra-high data rate, energy efficiency, wide coverage and connectivity, high reliability, and low latency. The current technologies cannot achieve all the mentioned requirements. New technologies and new approaches for deploying more active and passive nodes must be developed. Furthermore, the use of MMW band and THz band (30 - 300 GHz), in order to utilize their huge bandwidth, results in deploying more active node and more antennas due to high propagation losses and “LOS” behavior at this band. Development of innovative technologies is necessary to realize the above demand for growth of future wireless communication. The main task is to suggest solutions for the time varying characteristic of the wireless channel due to the user mobility and shadowing or blocking of communication channel. The current methods such as use of pilot channel to estimate the fading, various modulation or coding and beamforming, have overhead and limitations over random (large, unexpected changes) channels.

关键词： Wireless Communication Metasurface Intelligent Reflection Surface (IRS) Millimeter Wave (MMW)

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Detection and upconversion of three-dimensional MMW/THz images to the visible

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Photonics Research 2016年第6期4卷 306-312页

作者： Avihai Aharon(Akram) Daniel Rozban Avi Klein amir abramovich Yitzhak Yitzhaky Natan S.Kopeika Department of Electrical and Electronic Engineering Ariel University Department of Electrical and Computer Engineering Ben-Gurion University of the Negev Department of Electro-Optical Engineering Ben-Gurion University of the Negev

We present an inexpensive technique to obtain a three-dimensional(3D) millimeter wave(MMW) and terahertz(THz) image using upconversion. In this work we describe and demonstrate a method for upconversion of MMW/THz radiation to the visual band using a very inexpensive miniature glow discharge detector(GDD) and a silicon photodetector. We present MMW/THz upconversion images based on measuring the visual light emitting from the GDD rather than its electrical current. The results show better response time and better sensitivity compared to the electronic detection performed previously. Furthermore, in this work we perform frequency modulation continuous wave(FMCW) radar detection based on this method using a GDD lamp, with a photodetector to measure GDD light emission. By using FMCW detection, the range in addition to the intensity at each pixel can be obtained,thus yielding the 3D image. The GDD acts as a heterodyne mixer not only electronically but also optically. The suggested 3D upconversion technique using the GDD is simple and inexpensive and has better performance compared to other MMW/THz imaging systems suggested in the literature. This method provides minimum detectable signal power that is about 6 orders of magnitude better than similar plasma systems due to the very large internal signal gain deriving from the much smaller electrode separation and resulting in much higher plasma electric field.

关键词： THz Detection and upconversion of three-dimensional MMW/THz images to the visible FMCW

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