Hichem Guerboukha

Hichem Guerboukha
Brown University · Brown School of Engineering

Ph. D.

About

92
Publications
9,704
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856
Citations
Introduction
Hichem Guerboukha is currently a Postdoctoral Research Fellow at the School of Engineering, Brown University.

Publications

Publications (92)
Article
Full-text available
As the demand for bandwidth in wireless communication increases, carrier frequencies will reach the terahertz (THz) regime. One of the common preconceived notions is that, at these high frequencies, signals can radiate with high directivity which inherently provides more secure channels. Here, we describe the first study of the vulnerability of the...
Preprint
Full-text available
Security against eavesdropping is one of the key concerns in the design of any communication system. Many common considerations of the security of a wireless communication channel rely on comparing the signal level measured by Bob (the intended receiver) to that accessible to Eve (an eavesdropper). Frameworks such as Wyner's wiretap model ensure th...
Article
Full-text available
Terahertz (THz) near-field imaging is attracting a lot of attention for its potential applications in medical diagnosis and material characterization. However, the spatial resolution of the recorded THz image was mainly limited by the diffraction limit of the commonly used lens- and mirror-based THz optical systems. Alternatively, a solid immersion...
Article
Full-text available
One of the key distinctions between legacy low-frequency wireless systems and future THz wireless transmissions is that THz links will require high directionality, to overcome the large free-space path loss. Because of this directionality, optical phenomena become increasingly important as design considerations. A key example lies in the strong dep...
Conference Paper
We experimentally demonstrate the terahertz wireless channel fading due to atmospheric water vapor attenuation and distortion, and propose a protocol of utilizing this effect for physical-layer security.
Conference Paper
We demonstrate the vulnerability of a 200 GHz wireless link to a jamming attack and show how a jammer can exploit the broadband nature of typical receivers to reduce the target signal’s BER.
Conference Paper
A rapid and low-cost prototyping technique to fabricate terahertz metallic metasurfaces is presented. Arrays of split-ring resonators, wire-grid polarizers and polarizing beam splitters are demonstrated.
Preprint
Full-text available
Current wireless systems are experiencing unprecedented pressure that could be relieved by shifting carrier frequencies towards the terahertz spectrum. Yet, components are required to enable spectrally efficient communications at such high frequencies. Recently, the photonic crystal platform has been shown to enable signal processing at the chip-sc...
Article
Full-text available
Terahertz (THz) technology is promising in several applications such as imaging, spectroscopy and communications. Among several methods in the generation and detection of THz waves, a THz time-domain system that is developed using photoconductive antennas (PCA) as emitter and detector presents several advantages such as simple alignment, low cost,...
Article
Full-text available
We demonstrate a bar code sensing system for the THz region using leaky parallel plate waveguide and an off-axis parabolic mirror. The bars of the bar code are made from metal with air as gaps between them. We use up to 6 bars in the barcode system which can store up to 64 bits. Because the system employs coherent detection, we can further increase...
Article
Full-text available
Terahertz technology has greatly benefited from the recent development and generalization of prototyping technologies such as 3D printing and laser machining. These techniques can be used to rapidly fabricate optical devices for applications in sensing, imaging and communications. In this paper, we introduce hot stamping, a simple inexpensive and r...
Article
Full-text available
The design of antennas for terahertz systems remains a significant challenge. These antennas must provide very high gain to overcome significant free-space path loss, which limits their ability to broadcast or receive a beam over a wide angular range. To circumvent this limitation, here we describe a new device concept, based on the application of...
Conference Paper
We study the radiation properties of leaky-wave antenna at terahertz frequencies for wireless communications. We introduce a novel aperture design that increase the efficiency and directionality of the generated beams.
Conference Paper
In this work, we present an in-depth experimental and numerical study of the short-range THz communications links that use subwavelength dielectric fibers for information transmission and define main challenges and trade-offs in the link implementation.
Conference Paper
THz waveguide-based integrated solutions are of great utility in Terahertz communications. In this work, we propose a new type of modular 3D-printed micro-encapsulated two-wire plasmonic waveguide components to realize reconfigurable terahertz circuits for signal processing.
Conference Paper
We describe a Luneburg lens modified with quasi-conformal transformation optics. This device offers the possibility for wide-angle beam steering and reception over a broad bandwidth in the terahertz range.
Article
Full-text available
Due to their frequency-dependent angular emission, leaky-wave antennas have been recently introduced in the terahertz band to tackle many of the challenges associated with THz wireless communications. Most previous works have exploited conventional leaky-wave waveguide architectures developed for the microwave region. In this paper, we study in det...
Article
Full-text available
Terahertz (THz) band (0.1–10 THz) is the next frontier for ultra-high-speed communication systems. Currently, most of communications research in this spectral range is focused on wireless systems, while waveguide/fiber-based links have been less explored. Although free space communications have several advantages such as convenience in mobility for...
Article
Full-text available
In most existing terahertz communications systems, the THz carrier wave is transmitted via free-space channels. Therefore, THz waveguide-based integrated solutions can be of great utility at both the transmitter and receiver ends, thus simplifying the miniaturization and mass production of cost-effective THz communications systems. Here we present...
Preprint
Terahertz communications is a booming field in rapid development. While in most of the existing terahertz communication systems, modulated THz carrier wave is transmitted via free-space communication channels, the THz waveguide-based integrated solutions can be of great utility both at the transmitter and receiver ends. Thus, at the transmitter end...
Preprint
In this work, we present an in-depth experimental and numerical study of the short-range THz communications links that use subwavelength dielectric fibers for information transmission and define main challenges and tradeoffs in the link implementation. Particularly, we use air or foam-cladded polypropylene-core subwavelength dielectric THz fibers o...
Preprint
Terahertz subwavelength imaging aims at developing THz microscopes able to resolve deeply subwavelength features. To improve the spatial resolution beyond the diffraction limit, a current trend is to use various subwavelength probes to convert the near-field to the far-field. These techniques, while offering significant gains in spatial resolution,...
Article
A hollow-core Bragg waveguide-based resonant fluidic sensor operating in the terahertz frequency band is studied. A fused deposition modeling 3D printing technique with a Polylactic Acid filament is employed to fabricate the sensor where the liquid analyte is flowing in the microfluidic channel integrated into the waveguide cladding. The fluidic ch...
Article
Full-text available
Terahertz (THz) science and technology have greatly progressed over the past two decades to a point where the THz region of the electromagnetic spectrum is now a mature research area with many fundamental and practical applications. Furthermore, THz imaging is positioned to play a key role in many industrial applications, as THz technology is stead...
Preprint
Full-text available
We present a theoretical and experimental study of a 3D printed Photonic Bandgap (PBG) Bragg fiber based resonant microfluidic sensor in the terahertz (THz) frequency band. A widely used 3D printing technique (fused deposition modeling (FDM)) is employed to fabricate this sensor where the liquid analyte is filled in its microfluidic channel. A cont...
Article
Full-text available
Taming the Terahertz waves (100 GHz-10 THz) is considered the next frontier in wireless communications. While components for the ultra-high bandwidth Terahertz wireless communications were in rapid development over the past several years, however, their commercial availability is still lacking. Nevertheless, as we demonstrate in this paper, due to...
Article
Full-text available
Imaging at terahertz frequencies has recently received considerable attention because many materials are semitransparent to THz waves. The principal challenge that impedes a widespread use of THz imaging is the slow acquisition time of a conventional point-by-point raster scan. In this work, we present a theoretical formulation and an experimental...
Conference Paper
Acquisition time is a major hurdle in terahertz imaging. To reduce the number of pixels, we use spectral encoding in a single-pixel detection scheme. We demonstrate the reconstruction process for amplitude and phase masks.
Conference Paper
Single-pixel imaging has recently attracted a lot of attention. Here, we propose to use spectral encoding in a single-pixel detection scheme. We demonstrate the reconstruction process for amplitude and phase masks and we study the resolution.
Article
Full-text available
In this paper, we first discuss the main types of noise in a typical pump-probe system, and then focus specifically on terahertz time domain spectroscopy (THz-TDS) setups. We then introduce four statistical models for the noisy pulses obtained in such systems, and detail rigorous mathematical algorithms to de-noise such traces, find the proper aver...
Article
Full-text available
We present design and experimental validation of the system for the generation of the Orbital Angular Momentum (OAM) states using 3D-printed low-loss metamaterial phase plates for application in the terahertz (THz) wireless communications. By azimuthally varying the hole pattern density within the phase plate, the local effective refractive index i...
Article
Full-text available
We present the design and integration of Photonics based Terahertz wireless communication system using all commercially available system components. The performance of the developed system is then characterized by measuring the Bit error rate (BER) at the data rate of 5.5 Gbps as a function of communication link distance, angular rotation of the de...
Article
Full-text available
We present theoretical formulation and experimental demonstration of a novel technique for the fast compression-less terahertz imaging based on the broadband Fourier optics. The technique exploits k-vector/frequency duality in Fourier optics which allows using a single-pixel detector to perform angular scan along a circular path, while the broadban...