Muhammad Qasim Mehmood

• PhD
• Professor (Associate) at Information Technology University

Agri Photovoltaic (APV) systems are a key technology offering a coupled solution for both food and energy, which reduces the land requirement while meeting the sustainable development goals. This work presents a design and performance analysis of various APV systems by modelling tilted mono-facial, (tilted and vertical) bifacial, and the single-axi...

Milk adulteration poses a significant challenge in developing countries, impacting food safety and public health. This study introduces a multiplexed microfluidic paper-based analytical device (M-µPAD) for rapid and simultaneous detection of multiple milk adulterants. The M-µPAD, fabricated using readily available materials like filter paper and wa...

Interdigitated capacitive (IDC) sensors are one of the most commonly used sensors in wearable applications because of their high sensitivity and relatively simple manufacturing process. This is still true despite the numerous advantages of the technique, and its potential for broader sensing applications may be hampered by challenges like multiple...

Metasurfaces-based optics have emerged as a promising next-generation design platform for novel optical and computational paradigms poised to disrupt information and communication technologies. Among the various applications of metasurfaces, imaging has become a key focus in optics due to its potential to address diverse requirements in fields like...

Photoacoustic tomography (PAT) has emerged as a promising non-invasive imaging technology with significant potential for various clinical applications in medical settings. Traditionally, PAT utilizes a single laser beam to generate the excitation light (Wang & Hu,2012). Nonetheless, this method often suffers from low signal-to-noise ratios (SNR) an...

Structured beams carrying orbital angular momentum carry significant potential for various applications, including optical trapping, manipulations, communications, microscopy, and so on. Among these, perfect vortex (PV) beams are highly attractive due to their immunity to topological charge variations and nondiffracting properties. However, convent...

In optical wireless communication (OWC), the adaptability of infrared and visible spectra is attracting growing interest. These technologies are promising solutions for various real‐world applications, including indoor, underwater, vehicular, and IoT systems. However, conventional OWC systems are constrained by their bulky structures and fixed opti...

Ongoing advancements in holographic imaging technology have a considerable impact in various fields, specifically life sciences, owing to the 3D and precise visualization of microscopic structures. However, present-day imaging technologies, such as confocal, multiphoton microscopy, and digital holography microscopy, face constraints such as tagging...

Metasurfaces have emerged as a rapidly advancing technology enabling easy‐to‐integrate planar photonic devices, owing to their exceptional control of light‐matter interaction at a subwavelength scale. They offer unique optical functionalities for various applications, including medical imaging. Despite their early successes, fixed capabilities and...

Metalens is a cutting-edge optical marvel, revolutionizes a plethora of applications like cameras, telescope, augmented reality (AR) and virtual reality (VR). Despite having ultrathin structure, lightweight nature, and multifunctionality, achievement of both achromatic imaging and wide field of view (WFOV) remains a persistent challenge. To address...

Digital holographic imaging has emerged as a label-free, non-invasive, and powerful tool, offering a transformative method for the real-time investigation of morphology, density, and other physical and mechanical features of non-biological and biological samples. The rapid development of these portable, economical imaging systems for clinical/non-c...

Metasurface-based sensors are now becoming crucial for label-free and rapid-detection technologies in biomedical applications, leading to a growing demand for new highly sensitive meta-biosensors. This paper demonstrates a perfectly symmetrical quad-ray X-shaped THz meta-absorber (QRXMA), enabling narrowband and polarization insensitivity performan...

Dermoscopy is a diagnostic tool in biomedical science, enabling non-invasive, high-resolution imaging for early detection and diagnosis of skin diseases. Although there have been considerable improvements in functionality and applications of dermoscopy, enhancement of depth-of-focus (DOF) for detailed imaging of multiple layers of skin needs to be...

Nowadays, textile-based sensors are of great interest because of the significance of intelligent and smart textiles in wearable applications because of textiles’ washability, flexibility, and durability. We developed conductive yarn-based textile sensors for wearable multimode human-machine interface (HMIs), breathing, and walking pattern detection...

A reconfigurable intelligent surface (RIS), a leading‐edge technology, represents a new paradigm for adaptive control of electromagnetic waves between a source and a user. While RIS technology has proven effective in manipulating radio frequency waves using passive elements such as diodes and MEMS, its application in the optical domain is challengi...

It is known that field emission from random nano-structured surfaces cannot be well characterized with the original field emission model known as the Fowler–Nordheim (FN) law or the Murphy–Good (MG) law. To account for the roughness effects, the traditional approach was to introduce the arbitrary field enhancement factor β in the FN and MG laws. In...

The design of fast-response, highly sensitive, and eco-friendly sensors for monitoring human psychological and physical activity is an interesting research topic. In this research work, we have designed a semicircular-shaped printed sensor to monitor respiration response. A semicircular-shaped interdigitated elecreodes-based capacitive sensor is de...

Carbon-based monolithic perovskite solar cells (mPSCs) represent an enticing frontier in the domain of organic–inorganic hybrid solar cells, capturing substantial research attention due to their cost effectiveness and straightforward fabrication process. Despite these merits, the challenge of achieving uniform pore filling in mPSCs, especially with...

Optical wireless communication (OWC), with its blazing data transfer speed and unparalleled security, is a futuristic technology for wireless connectivity. Despite the significant advancements in OWC, the realization of tunable...

A chiral meta‐optics platform that incorporates hologram‐multiplexing with low phase distortion and wide‐incident angle tolerance over the broad spectral range of the ultraviolet‐visible (UV–vis) regimes holds great potential for photonic‐encryption‐based applications, particularly in next‐generation 3D displays, high‐resolution biomedical imaging,...

In recent years, microwave imaging (MWI) has emerged as a non-ionizing and cost-effective modality in healthcare, specifically within medical imaging. Concurrently, advances in artificial intelligence (AI) have significantly augmented the capabilities of medical imaging tools. This paper explores the intersection of these two domains, focusing on t...

Metasurfaces are a cutting-edge development in optical technology miniaturization, enabling the manipulation of light at a microscopic scale while providing unprecedented control over its intrinsic characteristics, such as amplitude, polarization, and phase. Researchers have been making significant progress in advancing and developing high-efficien...

Tremendous development in intelligent wearable gadgets creates opportunities for flexible strain sensors. Comfortable and safe flexible strain sensors have high demand in wearable applications and therefore the textile‐based strain sensors are desired. Achieving attributes like easy fabrication, cost‐effectiveness, high sensitivity, good stability,...

To harvest both light and heat for sensor applications, we present a theoretical investigation using first-principles calculations on monolayer MoS2 to exploit its electronic and optical properties, within and beyond the visible spectrum. By increasing doping concentrations of Ta in monolayer MoS2, we achieve a modulating band gap to capture the en...

Carbon electrode-based perovskite solar cells (c-PSCs) without a hole transport layer (HTL) have obtained a significant interest owing to their cost-effective, stable, and simplified structure. However, their application is limited by low efficiency and the prevalence of high-temperature processed electron transport layer (ETL), e.g. TiO2, which al...

Optical nano-structure designs usually employ computationally expensive and time-intensive electromagnetic (EM) simulations that call for resorting to modern-day data-oriented methods, making design robust and quicker. A unique dataset and hybrid image processing model combining a CNN with gated recurrent units is presented to foresee the EM absorp...

Ideal ultraviolet-visible-infrared (UV-VIS-NIR) absorbers with consistent performance at elevated temperatures and severe climate conditions are crucial to harvest energy for solar-thermophotovoltaic systems (STPVs). As solar energy promises to fulfill the power demands, its efficient utilization through high-performing light-absorbing devices is i...

This research presents designing a tunable trans-reflective color filter utilizing Barium Titanate (BTO) and optimizing its performance by applying an artificial intelligence (AI) based inverse design model. The AI-based color filter design process is efficient and minimizes design challenges. The AI model comprising two sub-blocks is trained using...

Switched filter banks find widespread application in frequency-hopping radar systems and communication networks with multiple operating frequencies, especially in situations demanding elevated filter element isolation. In this paper, the design and implementation of a highly isolated switchable narrow-bandpass filter bank architecture using hairpin...

Transparent solar thermo-photovoltaic (TPV) technology combines visible transparency and solar energy conversion. They are developed for their potential applications in buildings and vehicles windows, where conventional opaque solar cells may not be feasible. TPV’s offer a promising solution to harness solar energy without compromising aesthetics o...

Metasurfaces are engineered structures that offer an unprecedented nanoscale solution for precisely manipulating light’s magnitude, phase, and polarization, exhibiting the potential to reduce the size of optical configurations significantly. However, these structures often encounter performance limitations and are typically operational for a single...

Broadband Terahertz (THz) metamaterial absorbers with tunable absorption characteristics have been attracting a lot of attention due to their high demand and utilization in advanced optical systems. Therefore, we propose a single-layer graphene-supported metamaterial absorber with a combination of square, circular and cross-shaped meta-resonators,...

The potential of metasurface holography holds significant promise for revolutionary breakthroughs and groundbreaking advancements in imaging, chip-integrated AR/VR technology, and flat optical displays. Traditional diffractive systems, including metasurfaces, display fixed angular behavior due to the grating period defining incidence angles and dif...

Metasurfaces are ultrathin artificially engineered structures exquisitely designed to tailor the wavefront, polarization, and amplitude of incident light, offering a versatile platform for implementing compact and integrated photonics devices. Metasurface-based structured light generation has gained considerable attention in the scientific communit...

This paper presents two tandemly stacked forward and inverse deep neural networks to model and optimize cylindrical shaped transmissive meta-atoms for UV–Vis regime. Conventional modeling of these subwavelength meta-atoms calls for repetitive solution of Maxwell equations over each instance of a mesh grid using some high-end commercial EM simulator...

This work proposes a fractal Hilbert curve-based low-cost, easy-to-fabricate, highly sensitive, and noninvasive microwave sensor for the dielectric characterization of liquids. The sensor’s design comprises the second iteration of Hilbert curve fractal geometry and is fabricated on low-cost FR-4 material with an overall dimension of $0.28\,\,\lamb...

Perfect vortex (PV) beams exhibiting topological charge-insensitive annular intensity distribution appear as a striking hotspot for significant advances in optical communication and quantum optics and have great potential to fulfill the requirements of futuristic optical communication systems. The recently developed planar photonics devices possess...

This article reports a wide-band power divider with ultra-wide harmonic suppression. The filtering power divider consists of a Wilkinson power divider and a filter merged into a single structure. For filtering purposes, a novel suppressor cell is designed using resonators of various shapes. The power divider exhibits an operational frequency of 1.6...