A5091033584- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Plasmonic and Surface Plasmon Research
- Antenna Design and Analysis
- Silicon and Solar Cell Technologies
- Semiconductor Quantum Structures and Devices
- Microwave Engineering and Waveguides
- Orbital Angular Momentum in Optics
- Thin-Film Transistor Technologies
- Semiconductor materials and interfaces
- Antenna Design and Optimization
- Nanowire Synthesis and Applications
- Radio Frequency Integrated Circuit Design
- Conducting polymers and applications
- Photonic and Optical Devices
- Advancements in Semiconductor Devices and Circuit Design
- Photonic Crystals and Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Optical Imaging Technologies
- Silicon Nanostructures and Photoluminescence
- Organic Electronics and Photovoltaics
- Semiconductor materials and devices
- Energy Harvesting in Wireless Networks
- Liquid Crystal Research Advancements
- IoT-based Smart Home Systems
University of the Punjab
2018-2025
Information Technology University
2015-2025
Urban Unit
2023
National University of Sciences and Technology
2010-2019
University of the Sciences
2011-2015
National University of Science and Technology
2011-2013
University of Manchester
2008-2012
Abstract Helicity-multiplexed metasurfaces based on symmetric spin–orbit interactions (SOIs) have practical limits because they cannot provide central-symmetric holographic imaging. Asymmetric SOIs can effectively address such limitations, with several exciting applications in various fields ranging from asymmetric data inscription communications to dual side displays smart mobile devices. Low-loss dielectric materials an excellent platform for realizing exotic phenomena efficiently. In this...
Abstract Next‐generation holographic displays have promising applications in medical science, augmented/virtual reality, smart security, data encryption, etc. Although metasurfaces emerged as the suitable choice to provide compact displays, multifunctionality at broadband optical wavelengths is inevitable for abovementioned applications. Here, a metasurface demonstrated based on chiral structures introduce terms of multiple wavefront information depending upon polarization incident light....
Abstract Dielectric materials that are low‐loss in the visible spectrum provide a promising platform to realize pragmatic features of metasurfaces. Here, all‐dielectric, highly efficient, spin‐encoded transmission‐type metaholograms (in domain) demonstrated by utilizing hydrogenated amorphous silicon (a‐Si:H). In comparison previously reported based on TiO 2 and other dielectric materials, all‐dielectric metasurfaces cost‐effective more straightforwardly fabricated (aspect ratio 4.7), CMOS...
We present a generic approach for the generation of pseudo non-diffracting Bessel beams using polarization insensitive metasurfaces with high efficiency. Cascaded unit cells, which are fully symmetric, designed complete 2π phase control in transmission mode. Based on topological arrangements such two zero-order (i.e., single profile) and first-order merger distinct profiles) characterized. Both numerical simulations experimental measurements agreement each other, confirming electromagnetic...
A direction-multiplexed visible metahologram is proposed. We demonstrate monolayer direction-controlled multiplexing of a transmission type metasurface hologram made hydrogenated amorphous silicon in the domain.
Planar chiral structures respond differently for oppositely handed incident light, and thus can produce extraordinary chiroptical effects such as circular conversion dichroism (CCD) asymmetric transmission (AT). Such are powerful tools to realize the fundamental principle of optical spin isolation, which leads a plethora applications diodes, imaging, sensing. Here, we demonstrate simultaneous CCD AT through meticulously designed single-layered achiral nanofins. Our metamolecule consists four...
The climatic challenges are rising across the globe in general and worst hit under-developed countries particular. need for accurate measurements forecasting of pollutants with low-cost deployment is more pertinent today than ever before. Low-cost air quality monitoring sensors prone to erroneous measurements, frequent downtimes, uncertain operational conditions. Such a situation demands prudent approach ensure an effective flexible calibration scheme. We propose modular calibration,...
Achieving broadband and multifunctional response through a single optical device is highly sought-after capability for various applications like microscopy imaging, which provide detailed morphological information of targeted object. Traditional systems require chain elements to achieve such functionality, resulting in bulky hindering integration with modern photonics devices. Metasurfaces are exquisitely designed exhibit unprecedented light-manipulation at the nanoscale, thus creating...
Abstract 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 subwavelength scale. They offer unique optical functionalities for various applications, including medical imaging. Despite early successes, fixed capabilities and narrow operational bandwidths limit integration into advanced chip‐scale systems. Addressing the need ultra‐compact, high‐performance UV–Vis...
Transition metal oxides/silicon heterocontact solar cells are the subject of intense research efforts owing to their simpler processing steps and reduced parasitic absorption as compared with traditional silicon heterostructure counterparts. Recently, molybdenum oxide (MoOx, x < 3) has emerged an integral transition for crystalline (cSi)-based cell based on carrier-selective contacts (CSCs). In this paper, we physically modelled CSC-based cSi featuring MoOx/intrinsic a-Si:H/n-type...
Metasurfaces are nanometer-thick patterned interfaces that exhibit unprecedented control over the quintessential properties of light and provide a footing ground for many innovative optical effects groundbreaking phenomena like metalenses, complex wavefront shaping, polarimetric sensing, etc. Often multifunctional metasurfaces enact multitude simultaneous functionalities by employing photonic spin Hall effect (PSHE) allows independent photons through spin-orbital interactions. However,...
Ultrafast modulation of the refractive index exhibits either linear or nonlinear electro-optic (EO) effect, which is extensively utilized in tunable photonic circuits. Silicon, a mature material for on-chip devices, lacks strong Pockels effect. Utilization effect alters intrinsic property (refractive index) that manifests tunability and offers expanded functionalities. Driven by limited space constraints data storage, sensing, imaging applications, we propose an electrically meta-device...
The aim of project is to design an automated speed detection system which can detect the vehicles and if over-speeding occurs, extract license number vehicle send it via email Toll Plaza charge fine. designed for Punjab plates are currently implemented in Pakistan. Doppler effect phenomenon used measurement. If detected, a camera automatically captures picture Digital Image Processing (DIP) techniques applied number. MATLAB image processing. Afterwards, extracted plate sent Plaza. results...
Chiroptical effects are instrumental for various intriguing applications like chiro-optical spectroscopy and chiral imaging. Their on-chip realization can open novel avenues the demonstration of these at a miniaturized scale. One leverage unprecedented flexibility metasurfaces to tailor spinning light meticulously realizing chiroptical compact Here, we present unique methodology effectively achieve such by single-layered metasurface consisting two-dimensional array C2-symmetric meta-atoms....
Abstract Optical metasurfaces have gained attention due to their considerable prospects, which can benefit consumers and industries in terms of virtual reality devices digital displays various multimedia entertainment-related applications. To date, most the metasurface optimisation strategies involving isotropic or anisotropic nanoantennas encounter a trade-off between polarisation insensitivity operating bandwidth under unpolarised white light, is fundamental requirement for many...
The objective of this work is to use the concept energy harvesting i.e. receive Radio Frequency (RF) and Microwave signals present in atmosphere converting these into DC, order store it or power some circuit like charging a mobile. To implement concept, an antenna required capture RF microwave frequencies GSM WiFi surrounding. Designing focal point realization wireless cellular device. cannot be used drive load such as battery mobile phone, therefore rectification boost up done third phase...
Silicon (Si)-based solar cells constitute about 90% of the photovoltaic (PV) market, and a drastic reduction in module cost significant improvement PV performance have been observed since its first inception 1941. This article aims to present comprehensive review prominent advancements enacted Si after year 2000. Monocrystalline cell has matured technology with record efficiency (η) 26.6% achieved so far. As drive push η around 30% Schokley–Quiesser limit is foreseeable near future,...
Poor charge transport mechanism and light‐induced degradation effects are among the key factors leading to degraded performance of single‐junction amorphous silicon (a‐Si:H) solar cells. Existent photovoltaic configurations, based on carbide (a‐SiC:H) window layer, have established efficiencies in range 7–10%. Limited such devices has been addressed by replacing a‐SiC:H with a wide band gap (∼2 eV) hydrogenated nano‐crystalline (nc‐Si:H) layer that reportedly exhibits crystalline properties...