Papers by Ibrahim Abdulhalim
Communications biology, Jan 15, 2021
The proliferation and transmission of viruses has become a threat to worldwide biosecurity, as ex... more The proliferation and transmission of viruses has become a threat to worldwide biosecurity, as exemplified by the current COVID-19 pandemic. Early diagnosis of viral infection and disease control have always been critical. Virus detection can be achieved based on various plasmonic phenomena, including propagating surface plasmon resonance (SPR), localized SPR, surface-enhanced Raman scattering, surface-enhanced fluorescence and surfaceenhanced infrared absorption spectroscopy. The present review covers all available information on plasmonic-based virus detection, and collected data on these sensors based on several parameters. These data will assist the audience in advancing research and development of a new generation of versatile virus biosensors. umanity faces rising risks from emerging and reemerging viral infectious diseases, such as influenza virus, dengue virus (DENV), human immunodeficiency virus (HIV), swine flu, Ebola virus, severe acute respiratory syndrome coronavirus (SARS-CoV), and last but not least SARS coronavirus-2 (SARS-CoV-2; COVID-19) 1,2 . These viruses are fast-spreading and hence represent a threat to human health, with substantial global economic and social impacts. Infectious agents like these have specific binding receptor enzymes for binding to the host cell. They enter into the system via our organs, followed by a pathogenetic process, where they weaken the immune system causing several basic symptoms such as cough, cold and fever, leading to lung inflammation and sometimes organ failure and even death . COVID-19, for example, easily binds to lung cells, causing pneumonia and short breath. According to data obtained from various sources, over the past century viral pandemics have resulted in millions of deaths (see Table ). Currently, alongside several persisting pandemics, the world is fighting a new type of SARS-CoV-2. COVID-19 is believed to have originated in Wuhan, China, in December 2019. From there, it rapidly spread across the globe. The World Health Organization declared this spread a public health emergency on 30th January 2020 and named the disease ). Until 2nd November 2020, 46.8 million people have been infected by COVID-19 and counting, increasing at a rate of nearly 0.4 million per day, of which ~1.2 million have died at a growth rate of nearly 5000 per day.
Elsevier eBooks, 2014
This chapter reviews some of the fabrication techniques to be used for realization of the integra... more This chapter reviews some of the fabrication techniques to be used for realization of the integrated nanophotonic devices. Nanofabrication technologies are applied for the manufacture of nanoscale devices applicable to fields of research such as microelectronics or nanophotonics. Usually, the fabricated devices are made out of semiconductor materials, dielectrics, oxides, and metals. Most of the manufacturing processes of nanoscale devices consist of two basic stages—formation of an image on a surface of a material and processing and patterning the surface. In general, image formation on a surface of a chip may be obtained by means of deposition of a layer of a photosensitive material—photo-resist, or a material sensitive to an electron beam—electron-resist, or a material sensitive to an X-ray and then its exposition. There are several techniques and fabrication means capable of performing the exposition and realization of the devices. Frequently usable technological means include electron beam direct-write lithography, where scanning focused electron beam is used, atomic force microscopic (AFM) nanolithography where the image formation on the surface occurs by means of controlled movement of the sharp end of a tip, and optical mask-less lithography where spatial light modulation (SLM) devices may be used in order to form the photonic distribution on the surface of the device following controlled electric signals.
Applied Optics, Sep 12, 2017
There is a debate on whether phase measurement in surface plasmon resonance (SPR) sensors give be... more There is a debate on whether phase measurement in surface plasmon resonance (SPR) sensors give better resolution than intensity measurement. In this work, we show that each one of the modes can give better resolution depending on the metal layer thickness chosen, as well as the available noise levels in the system. We propose a three point polarimetric approach to extract the ellipsometric parameters and phase information in the spectral mode. It is shown that the polarimetric measurement at its optimal thickness range gives up to seven-fold higher resolution than the intensity, especially at noise levels of off the shelf spectrometers. When noise levels are very low, the resolution in the two modes becomes nearly equal. The same is true when considering the whole SPR curve rather than single point detection. However, it is clearly shown both experimentally and theoretically that the polarimetric measurements at their optimal range give much better resolution than the intensity.
arXiv (Cornell University), Nov 2, 2021
arXiv (Cornell University), Feb 27, 2018
Electrodes with higher transparency that can also align liquid crystals (LCs) are of high importa... more Electrodes with higher transparency that can also align liquid crystals (LCs) are of high importance for improved costs and energy consumption of LC displays. Here we demonstrate for the first time alignment of liquid crystals on femtosecond laser nanostructured indium tin oxide (ITO) coated glass exhibiting also higher transparency due to the less interface reflections. The nano paterns were created by fs laser directlly on ITO films without any additional spin coating materials or lithography procces. Nine regions of laser-induced nanostructures were fabricated with different alignment orientations and various pulse energy levels on top of the ITO. The device interfacial anchoring energy was found to be 1.063 × 10 -6 𝐽 𝑚 2 ⁄ , comparable to the anchoring energy of nematic LC on photosensitive polymers. The device exhibits contrast of 30:1 and relaxation time of 330ms expected for thick LC devices. The measured transparency of the LC device with two ITO nanograting substrates is 10% higher than the uniform ITO film based LC devices. The alignment methodology presented here paves the way for improved LC displays and new structured LC photonic devices.
Journal of Physical Chemistry C, Aug 11, 2015
Excitation of localized surface plasmons (LSPs) of metal nanoparticles (NPs) residing on a flat m... more Excitation of localized surface plasmons (LSPs) of metal nanoparticles (NPs) residing on a flat metal film has attracted great attentions recently due to the enhanced electromagnetic (EM) fields found to be higher than the case of NPs on a dielectric substrate. In the present work, it is shown that even much higher enhancement of EM fields is obtained by exciting the LSPs through extended surface plasmons (ESPs) generated at the metallic film surface using the Kretschmann-Raether configuration. We show that the largest EM field enhancement and the highest surface-enhanced fluorescence intensity are obtained when the incidence angle is the ESP resonance angle of the underlying metal film. The finite-difference time-domain simulations indicate that excitation of LSPs using ESPs can generate 1-3 orders higher EM field intensity than direct excitation of the LSPs using incidence from free space. The ultrahigh enhancement is attributed to the strong confinement of the ESP waves in the vertical direction. The drastically intensified EM fields are significant for highly-sensitive refractive index sensing, surface-enhanced spectroscopies, and enhancing the efficiency of optoelectronic devices.
arXiv (Cornell University), Jan 12, 2018
Transition metal chalcogenide tin sulfide (SnS) films as alternative noncontact alignment layer f... more Transition metal chalcogenide tin sulfide (SnS) films as alternative noncontact alignment layer for liquid crystals, have been demonstrated and investigated. The SnS has an anisotropic atomic chain structure similar to black Phosphorous which causes the liquid crystal molecules to align without the need for any additional surface treatments. The high anisotropic nature of SnS promotes the alignment of the easy axis of liquid crystal molecules along the periodic atomic grooves of the SnS layer. The atomically thin SnS layers were deposited on indium tin oxide films on glass substrates, at room temperature by chemical vapor deposition. The device characteristics are comparable to those commercially available, which use photo-aligning polymer materials. We measured threshold voltage of 0.92V, anchoring energy of 1.573 × 10 -6 𝐽/𝑚 2 , contrast ratio better than 71:1 and electro-optical rise/fall times of 80/390ms, respectively for ~11 micron thick liquid crystal device as expected.
Spie Newsroom, Sep 5, 2014
Harnessing the strong electro-optic properties of liquid crystals permits high-resolution, extend... more Harnessing the strong electro-optic properties of liquid crystals permits high-resolution, extended depth of focus, and multi-parameter imaging.
Sensors and Actuators A-physical, Apr 1, 2017
Flexible membranes have applications in liquid filled lenses and pressure sensors. They deform un... more Flexible membranes have applications in liquid filled lenses and pressure sensors. They deform under hydrostatic pressure, thus changing the asphericity of the lens and its focal length. This behavior enables tuning of the lens by changing the pressure of the fluid inside. A universal form of the nonlinear differential equations describing the deformation of a flexible membrane is presented here, showing that their solution is valid for membranes having the same thickness to radius ratio and made of materials having the same flexural rigidity and Poisson ratios. Hence by solving the equations once, a simple scaling allows obtaining a set of solutions that matches these ratios. This should simplify the design of tunable lenses and pressure sensors based on flexible membranes. In addition, approximate analytic solutions are presented in a normalized form.
ACS Applied Energy Materials
Nanomaterials for Water Management, 2015
The majority of commercially available surface plasmon resonance (SPR) sensors rely solely on the... more The majority of commercially available surface plasmon resonance (SPR) sensors rely solely on the detection of the intensity minimum of the reflected signal avoiding the extraction of the polarization properties. Such properties, i.e. the phase difference between polarization components and the azimuthal angle of the polarization ellipse, give sharper responses than the intensity which lead to a better measurement accuracy. Therefore, the lack of extraction of polarization properties in such devices significantly limits their performance. In this work we suggest different configurations of multifunctioning SPR sensing systems that can extract both the normalized reflectivity and the polarization properties simultaneously in the angular and spectral modes. This leads to a significant boost in the performance of existing SPR sensors as multi-parametric functioning systems.
Dataset for Cerkauskaite, A., Drevinskas, R., Solodar, A., Abdulhalim, I., & Kazansky, P. (2017).... more Dataset for Cerkauskaite, A., Drevinskas, R., Solodar, A., Abdulhalim, I., & Kazansky, P. (2017). Form-Birefringence in ITO Thin Films Engineered by Ultrafast Laser Nanostructuring. ACS Photonics.
Sensors and Actuators B: Chemical, 2021
Abstract Photonic techniques based on evanescent waves sensing (such as the surface plasmon reson... more Abstract Photonic techniques based on evanescent waves sensing (such as the surface plasmon resonance (SPR) method) using plasmonic and nanostructured metallic/semiconductor materials hold huge potential in biosensing and associated analysis of biomolecular interactions. However, conventional SPR suffers from low penetration depths (
Journal of Materials Chemistry C, 2021
Fabrication of STF VO2 by an industrially viable sputtering deposition following heat-treatment, ... more Fabrication of STF VO2 by an industrially viable sputtering deposition following heat-treatment, and optical measurements for thermochromic smart window application.
2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC), Jun 1, 2017
Particle & Particle Systems Characterization, 2020
Advanced Materials Interfaces, 2019
A complete control of the localized surface plasmon resonance (LSPR) properties of different type... more A complete control of the localized surface plasmon resonance (LSPR) properties of different types of metal nanoparticles (size, shape, or composition) in a device by facile techniques with high throughput is crucial to intensively study and apply the LSPR effects to improve device performance. Here, a versatile approach is presented to fabricate macroscopic and in‐plane multiplex arrays of plasmonic nanoparticles with well‐defined particle size or composition allocation. The polymer layer (poly(N‐isopropylacrylamide), PNIPAM) spin‐coated on the surface of the substrate is applied as a protective layer to control the growth of the Au nanoparticles in a dip‐coating procedure. The relative contribution of LSPR of each particle type can be controlled by selectively adjusting the particle size or composition at the desired position of multiplex arrays on the same substrate. A synergistic enhanced photocurrent response is observed in the metal–semiconductor system, which is attributed to...
Applied Physics Letters, 2019
Surface modification of the widely used ZnO interfacial layer is a crucial issue for the developm... more Surface modification of the widely used ZnO interfacial layer is a crucial issue for the development of photoelectric devices toward high efficiency and long-term stability. Most conventional surface modifications of ZnO interfacial layers involve only a one-sided modification (e.g., a ZnO/active layer interface), which limits the electrical and electronic performance of the resulting interfacial layer. Herein, we report a double-sided surface modification strategy in which both sides of the ZnO interfacial layer are modified. The resulting double-sided modified ZnO layers are used to enhance the photovoltaic performance of inverted organic solar cells as electron-transporting layers (ETLs). Compared with devices based on unmodified ZnO interfacial layers, the power conversion efficiencies of devices using the modified ZnO interfacial layer are markedly enhanced, from 3.42% to 4.23% for the P3HT:PC61BM active layer, and from 7.57% to 8.61% for the PTB7:PC71BM blend system. The enhan...
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Papers by Ibrahim Abdulhalim