Mohammad Haerinia

University of Massachusetts Lowell | UML · Department of Electrical & Computer Engineering

Flexible hybrid electronics (FHE) is an emerging technology enabled through the integration of semiconductor devices and 3D printing technology. It unlocks tremendous market potential by realizing low-cost flexible circuits and systems that can be conformally integrated into various applications. However, the operating frequencies of most reported...

Flexible hybrid electronics (FHE) is an emerging technology enabled through the integration of semiconductor devices and additive manufacturing technology. It unlocks tremendous market potential by realizing low-cost flexible circuits and systems that can be conformally integrated into various applications. However, the operating frequencies of mos...

Flexible hybrid electronics (FHE) is an emerging technology enabled through the integration of advanced semiconductor devices and 3D printing technology. It unlocks tremendous market potential by realizing low-cost flexible circuits and systems that can be conformally integrated into various applications. However, the operating frequencies of most...

Flexible hybrid electronics (FHE) is an emerging technology enabled through the integration of advanced semiconductor devices and 3D printing technology. It unlocks tremendous market potential by realizing low-cost flexible circuits and systems that can be conformally integrated into various applications. However, the operating frequencies of most...

We present an automatic differentiable R-DIT for the fast inverse design of photonic structures. We demonstrated that the proposed method could achieve a 30% speedup per optimization on GPUs compared with the differentiable RCWA.

High-resolution endoscopic optical imaging is a crucial technique in biological imaging to examine the inside organs. There is a trade-off between lateral resolution and depth of focus in such applications. Traditional Optical Coherence Tomography (OCT) provides an increased depth range but falls short of desired resolution. The combination of both...

In this paper, a low-profile flexible dual-band quasi-isotropic antenna based on half-wavelength crossed dipoles is developed for unmanned aerial vehicle (UAV) applications. Specifically, to decrease the antenna profile, a coaxial structure is used to feed the antenna and no external balun is applied. Theoretical and numerical analyses of the desig...

This article presents a novel method for the forward modeling and inverse design of a class of Schiffman phase shifters using deep neural networks (DNNs). Since DNNs are capable of mapping the highly nonlinear correlations between inputs and outputs, we constructed a fully connected DNN to predict the electromagnetic (EM) responses of Schiffman pha...

We report an actively tunable topological edge mode laser in a one-dimensional Su-Schrieffer-Heeger (SSH) laser chain, where the SSH chain is realized in an electrically-injected Fabry-Perot (FP) laser array. A non-Hermitian SSH model is developed to investigate the SSH laser chain with tunable active topological defect. We theoretically demonstrat...

Filtering light by coherence by metasurfaces would enable compact, integrable coherence filters. A recent such proposal centered on a metasurface of zigzags. Here, we show that spatial coherence filtering can be achieved at normal incidence with a similar zigzag metasurface and can be traced to the band structure of the leaky modes of the thin film...

This paper presents a novel method for the forward modeling and inverse design of a class of Schiffman phase shifters using Deep Neural Networks (DNNs). Since DNNs are capable of mapping the highly nonlinear correlations between inputs and outputs, we constructed a fully-connected DNN to predict the electromagnetic (EM) responses of Schiffman phase...

p>This manuscript contains 11 pages and 11 figures. The datasets used during training and the deployed Schiffman phase shifter design tool is open source and available at: https://github.com/SensongAn/DNN-Schiffman-phase-shifter .</p

Metasurfaces have provided a novel and promising platform for realizing compact and high‐performance optical devices. The conventional metasurface design approach assumes periodic boundary conditions for each element, which is inaccurate in most cases since near‐field coupling effects between elements will change when the element is surrounded by n...

In this paper, an ultra-wideband tightly couple antenna array based on a low-loss phase-modulated frequency selective surface and a microstrip-based feeding structure is reported. The proposed antenna array, which employs tightly coupled bow-tie elements, features a very low profile (1.08 λhigh). Specifically, a microstrip-to-parallel strip transit...

Wireless power transmission (WPT) is a critical technology that provides a secure alternative mechanism for wireless power and communication with implantable medical devices. For instance, the inductive coupling tac-tic is mostly employed for transmission of energy to neurostimulators, and the ultrasonic method is used for deep-seated implants. The...

Metasurface optics devices feature powerful capability for wavefront manipulation by guiding the propagation of incident light efficiently. We present a classification of freestanding dielectric meta-optics to achieve efficient ultrathin optical elements and guiding light without metals. Specifically, freestanding dielectric metasurfaces provide ad...

Tunable metasurfaces are of great potential for the next-generation electromagnetic systems (e.g. beamforming systems due to the capabilities for ultra-fast reconfiguration speed and agile beam programming on the go). The fundamental aspects of tunable metasurfaces laid on their freedom in manipulating the phase and amplitude of the outgoing wavefr...

Metasurfaces have provided a novel and promising platform for the realization of compact and large-scale optical devices. The conventional metasurface design approach assumes periodic boundary conditions for each element, which is inaccurate in most cases since the near-field coupling effects between elements will change when surrounded by non-iden...

We propose a deep learning approach that predicts the performance of meta-atoms placed among different neighbors. It provides a fast way to explore the impact of mutual coupling to metasurfaces’ performance and conduct further optimizations.

Dielectric meta-atoms enable ultra-thin optical devices but have complex electromagnetic responses. Neural networks mitigate the complexity but have had limited predictive scope. We present a network for near-arbitrary materials and spectral regimes.

Wireless power transmission (WPT) is a critical technology that provides an alternative for wireless power and communication with implantable medical devices (IMDs). This article provides a study concentrating on popular WPT techniques for IMDs including inductive coupling, microwave, ultrasound, and hybrid wireless power transmission (HWPT) system...

Any biomedical device requiring power from a source other than the human body or gravity is considered an active device. Currently available active biomedical devices encompass an enormous variety of technologies, ranging from large imaging machines to miniature implantable stimulators. These devices are vulnerable to cybersecurity threats, especia...

We present rotational misalignment and bending effects on a hybrid system to transfer power and data wirelessly for an implantable device. The proposed system consists of a high-frequency coil (13.56 MHz) to transfer power and an ultra-high frequency antenna (905 MHz) for data communication. The system performance and the transmitted power were stu...

In this paper, we analyze the bending effects on a dual-band antenna, operating at two ultra-high frequency bands (1.6GHz/3.6GHz). The antenna is proposed for wireless power transfer for biomedical applications. This antenna is considered to be printed on a flexible substrate and be implanted inside human body tissue at 10 mm depth. The performance...

In this paper, we investigate the effects of lateral and angular misalignment on the link budget of a dual-band antenna operating at ultra-high frequency bands (1.64 GHz and 3.56 GHz) for usage in implanted medical devices. The antennas were simulated when located inside muscle tissue. Insertion loss and transmission efficiency for different misali...

This paper is presenting a hybrid system including a high frequency (HF) coil and a dual Ultra High-Frequency (UHF) antenna for Wireless Power Transfer (WPT) applications. The coils' operating frequencies are 510 MHz, and the antennas work at 2.48 GHz and 4.66 GHz. The system was designed and fabricated on FR4 substrates. The antennas can be used f...

In this work, a dual-band printed planar antenna, operating at two ultra-high frequency bands (2.5 GHz/4.5 GHz), is proposed for wireless power transfer for wearable applications. The receiving antenna is printed on a Kapton polyimide-based flexible substrate, and the transmitting antenna is on FR-4 substrate. The receiver antenna occupies 2.1 cm 2...

This chapter studies an inductive-based wireless power transfer system for low-power applications at short distances. The transferring power system has been modeled, simulated and analyzed via finite element method. A wireless power transfer systemincludes important parts such as coil, core and driver. In this chapter, the important parts of an ind...

In this paper, we present a hybrid system consisting of a novel design of a microstrip antenna that can be designed to resonate at various frequencies within the ultra-high frequency (UHF) band (e.g. 415 MHz, 905 MHz, and 1300 MHz), combined with a pair of high frequency (HF) coils (13.56 MHz). The system is designed to be fabricated on an FR4 subs...

This paper studies a high frequency inverter for low power applications at a short distance. Class 𝐸𝐹2 inverter is selected and designed as a transmitting driver. A printed spiral coil is designed as a transmitting coil and is connected to the high frequency inverter. Experimental results are obtained to compare with simulation results. The experim...

This paper will examine the technical and economic optimization of renewable energy for residential buildings. Due to climate conditions, different cities have a different potential for the use of renewable energies. For this study, the optimal model using HOMER software for an apartment with a maximum power consumption of 63 kW and 393 kWh of ener...

This paper proposes an inductive coupled wireless power transfer system that analyses the relationship between induced voltage and distance of resonating inductance in a printed circuit spiral coils. The resonant frequency produced by the circuit model of the proposed receiving and transmitting coils are analysed by simulation and laboratory experi...

Inductive power transfer is recently a common method for transferring power. This technology is developing as the modern technologies need to get more efficient and updated. The power transfer efficiency has potential to get better. There are different ways to achieve a desirable efficiency. In this paper, a suitable geometry of a coil for transfer...

This paper involves designing and applying electric field analysis on insulator string. Insulator strings for high-voltage overhead transmission lines provide the mechanical insulator system between the live conductors and the pole. Environmental stress, electrical and thermal activities can induce changes to their electrical and mechanical propert...