Article
Optics
Shibiao Wei, Guiyuan Cao, Han Lin, Haoran Mu, Wenbo Liu, Xiaocong Yuan, Michael Somekh, Baohua Jia
Summary: The new implementation of detour phase graphene flat lens allows for flexible adjustment of annular number and width, achieving the same focal length without significant distortions. This can significantly weaken the requirement of the nanofabrication system, which is important for the development of large-scale flat lenses in industry applications.
PHOTONICS RESEARCH
(2021)
Article
Optics
Jiaran Qi, Yongheng Mu, Shaozhi Wang, Zhiying Yin, Jinghui Qiu
Summary: A birefringent metalens is proposed to achieve an ultradeep DOF and widen the NA range for high-resolution imaging. By combining holography accuracy and polarization multiplexing, the system performance is enhanced through a hybrid methodology and structural design.
PHOTONICS RESEARCH
(2021)
Article
Multidisciplinary Sciences
Akshaya Kumar Aliyana, S. K. Naveen Kumar, Pradeep Marimuthu, Aiswarya Baburaj, Michael Adetunji, Terrance Frederick, Praveen Sekhar, Renny Edwin Fernandez
Summary: A machine learning approach was used to correlate impedance variations in F-MWCNT/ZnO-NFs nanocomposites with NH4+ ion concentrations, leading to the identification of prominent features that can be used as predictors for estimating NH4+ ion levels. The decision-making model developed in this study can operate at specific frequencies to continuously collect relevant information.
SCIENTIFIC REPORTS
(2021)
Article
Optics
Fan Wang, Tomoyoshi Ito, Tomoyoshi Shimobaba
Summary: In this study, an analytical spectrum method based on the principle of spectral energy concentration is proposed, which achieves a speedup of nearly 30 times and generates high-resolution (8K) holograms with low memory requirements. Additionally, a occlusion culling scheme based on triangular subdivision and octree structures is proposed to achieve a 3D parallax sense with minimal computational overhead. The numerical and optical reconstructions confirm the generalizability of the proposed pipeline.
PHOTONICS RESEARCH
(2023)
Article
Optics
Zhuo Sun, Juntao Hu, Yishu Wang, Wenni Ye, Yixian Qian, Xinzhong Li
Summary: Using angular spectral representation, this study demonstrates a generalized approach for generating high-dimensional elliptic umbilic and hyperbolic umbilic caustics by phase holograms. The properties of these umbilic beams are investigated via diffraction catastrophe theory and they exhibit unique features such as autofocusing and self-healing. Numerical results and experimental verification show their potential applications in particle manipulation and optical micromachining.
Article
Chemistry, Analytical
Fei Su, Xiongjian Luo, Zhongbo Du, Zelyu Chen, Yuanhua Liu, Xuan Jin, Zhiyong Guo, Jie Lu, Dayong Jin
Summary: This study improved the imaging contrast in immunohistochemistry by using high-density labeling of long-lifetime lanthanide complexes and time-gated imaging. The results showed that the enhanced method allows for more precise detection of biomarkers in tissue sections.
ANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Electrical & Electronic
Tamar Haimov, Koray Aydin, Jacob Scheuer
Summary: The proposed approach utilizes an active VO2 layer and a Bragg reflector to achieve dynamic holography at optical frequencies; a reconfigurable metasurface for tunable binary holography is proposed and analyzed; the device can also function as a broad-angle perfect absorber when tuned to the proper temperature.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Optics
Zhulin Yao, Xiaowei Li, Zhipeng Wang, Zhentao Xu, Andong Wang, Lingling Huang, Jiangang Lu, Honglei Wang
Summary: The method demonstrated the fabrication of computer-generated holograms using a femtosecond Bessel beam on transparent glass, allowing for flexible adjustment of the phase profile to generate desired patterns by changing relative positions. Twin images were eliminated through high-level modulation.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Boxiang Zhang, Zhiyong Zhang, Chuanhong Jin
Summary: Polymer-sorted high-density carbon nanotube (CNT) arrays have the potential to extend the silicon-based Moore's law. Imaging these arrays using LVSEM on insulating substrates is necessary but challenging due to the nanoscale features and complex contrast. Two methods were developed to separate the contrasts and the imaging mechanism was investigated. The proposed contrast separation method can be a useful tool for further study and application of CNT arrays.
Article
Optics
R. B. Eisswanger, P. Russ, S. R. Eichelt
Summary: In traditional interferometric null test measurements, retrace errors can occur when the measurement and reference beam paths are not the same. One approach to avoid retrace errors is to use a computer generated hologram (CGH), but this method is costly and time consuming. An alternative method is to use mathematical treatment of retrace errors in non-null test measurements, but it may be limited due to the need for optical design optimization or calibration, especially when standard off the shelf components are used. The Black Box Model (BBM) introduced in Tilted Wave Interferometry (TWI) is a mathematical model that accounts for retrace errors without the need for a specific optical design, making it attractive for interferometry applications with standard components.
Article
Optics
Chenqian Wang, Chinhua Wang
Summary: By splitting one conventional helical surface into two nested ones, high-efficiency and chirality-reversible metalens imaging can be achieved. Twisting the relative orientations of the two nested helical surfaces significantly enhances the conversion efficiency of cross-circular polarization, providing a new method to enhance chiral imaging efficiencies and design possibilities for practical applications.
Article
Optics
Lea Krafft, Pierre Senee, Elena Gofas, Olivier Thouvenin, Michael Atlan, Michel Paques, Serge Meimon, Pedro Mece
Summary: We demonstrate the feasibility of a multimodal adaptive optics flood-illumination ophthalmoscope, which can provide both bright-field and dark-field images (such as phase contrast). By integrating a digital micromirror device (DMD) at the illumination path, we were able to achieve multimodality by projecting high-resolution patterns into the retina. Through versatile post-processing methods, we increased the contrast of bright-field images and visualized translucent retinal features through phase contrast.
Article
Optics
Ruonan Ji, Kun Song, Xuyue Guo, Xin Xie, Yang Zhao, Chuan Jin, Shaowei Wang, Chengming Jiang, Jianbo Yin, Yahong Liu, Shilong Zhai, Xiaopeng Zhao, Wei Lu
Summary: The paper proposes a strategy to achieve simultaneous wavefront shaping and polarization rotation, utilizing a spin-decoupled phase metasurface and Pancharatnam-Berry geometric phase. This enables high efficiency polarization-insensitive hologram generator and multiple ring vortex beam generator designs. The strategy provides a simple and pixel-saving approach for designing integrated and multitasking devices.
Article
Materials Science, Multidisciplinary
Yugan Tang, Ya Zhang, Boyang Xie, Hui Liu, Hua Cheng, Jianguo Tian, Shuqi Chen
Summary: In this study, a passive reflective Janus coding acoustic metasurface is proposed and its performance is demonstrated numerically and experimentally. The metasurface is composed of double-layer variable-pitch helical structures with smoothly varying acoustic impedance, which enables two-faced direction-dependent coding. The switchable Janus coding metasurface can achieve switchable functions on one side without affecting the other side.
Article
Computer Science, Hardware & Architecture
Yang Wu, Xiangli Lei, Jun Wang, Ni Chen
Summary: Holographic display is an ideal method for 3D display, providing a realistic stereo perception for augmented reality prototypes without complex optical devices. However, generating high-quality holographic reconstructed images quickly and accurately has been a challenge. This study proposes a first-order optimization algorithm using the conjugate gradient direction to update phase parameters, which outperforms the widely used stochastic gradient method and the wirtinger holography method in terms of faster optimization with the same quality metrics.
Article
Chemistry, Analytical
Yousef Alqurashi, Mohamed Elsherif, Asail Hendi, Khamis Essa, Haider Butt
Summary: A novel pH sensor based on a pH-responsive hydrogel has been developed, which measures pH by measuring the change in optical power of the sensor under different pH conditions. The sensor exhibits good performance.
Article
Polymer Science
Filmon Tsegay, Mohamed Elsherif, Haider Butt
Summary: Wounds can become chronic and even lead to mortality. However, 3D printed wound dressings loaded with various items such as antibiotics and antibacterial nanoparticles have emerged as a promising solution for accelerating wound healing.
Article
Chemistry, Multidisciplinary
Ahmed E. Salih, Mohamed Elsherif, Fahad Alam, Matteo Chiesa, Haider Butt
Summary: In this study, gold nanoparticles (GNPs) were functionalized with 3-mercaptopropionic acid (GNPs-MPA) and doped into hydrogel materials using the breathing-in/breathing-out (BI-BO) method. The pH-responsive optical and colorimetric properties of the GNPs-MPA solutions and gels were investigated through UV-Vis spectroscopy and microscopy. The results showed that the color of the solutions and gels changed from red to indigo with a decrease in pH, indicating their potential as pH-triggered sensors.
Article
Materials Science, Biomaterials
Ahmed E. Salih, Mohamed Elsherif, Fahad Alam, Bader Alqattan, Ali K. Yetisen, Haider Butt
Summary: Integration of nanomaterials into hydrogels is widely used in sensing, cancer therapy, and bone tissue engineering. In this study, gold and silver nanocomposite contact lenses were fabricated using a breathing-in/breathing-out method. The optical properties and stability of the nanocomposites were characterized, and the dispersion of nanoparticles within the lenses was determined. The results show that these nanocomposite lenses can be used for color filtering and antibacterial applications, and the fabrication method allows for the incorporation of nanoparticles with diverse morphologies.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Israr Ahmed, Mohamed Elsherif, Seongjun Park, Ali K. Yetisen, Haider Butt
Summary: This study developed rapid, reliable, and reusable alcohol sensors based on hydrogel-based fiber optic probes. The sensors were fabricated using a simple, rapid, and facile process by imprinting Aztec microstructures onto alcohol-sensitive hydrogels. The sensors showed real-time sensing capability towards various concentrations of ethanol, isopropanol, methanol, and dimethyl sulfoxide. The developed optical fiber sensors exhibited fast response time, high sensitivity, and low limit of detection, making them suitable for remote and real-time alcohol sensing in multiple industries.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Analytical
Oleg Shiryayev, Nader Vahdati, Fook Fah Yap, Haider Butt
Summary: This paper proposes a sensor design for measuring large strains by using a compliant mechanism to transfer the input strain to the sensing beam with an optical strain gauge. An analytical model of the sensor is developed and verified through finite element analysis and experimental validation. The sensor is capable of handling large input strains and has potential applications in compliant elastomeric structures, wearables, and soft robotics.
Article
Biochemistry & Molecular Biology
Doaa M. Khaled, Mohamed E. Elshakre, Mahmoud A. Noamaan, Haider Butt, Marwa M. Abdel Fattah, Dalia A. Gaber
Summary: Computational chemistry, molecular docking, and drug design approaches were used in this study to evaluate the antitumor activity of thiouracil-based dihydroindeno pyrido pyrimidine derivatives against topoisomerase I and II. The IC50 values of various cell lines were determined using biochemical methods. The computed reactivity descriptors and physicochemical parameters showed good agreement with drug criteria. Molecular docking analysis provided information on binding sites, binding energies, and deactivation constants. QSAR models were developed to correlate IC50 values of colorectal cell line HCT with physicochemical and quantum chemical descriptors, showing good predictive power.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Biochemistry & Molecular Biology
Filmon Tsegay, Muhammed Hisham, Mohamed Elsherif, Andreas Schiffer, Haider Butt
Summary: The benefits of enclosing pH sensors into wound dressings include treatment monitoring of wounded skin and early detection of developing chronic conditions, especially for diabetic patients. A 3D printed re-entrant auxetic hydrogel wound dressing, doped with pH indicator phenol red dye, was developed and characterized. The integration of color-changing pH indicators allows patients to monitor the wound's healing process using a smartphone.
Article
Computer Science, Artificial Intelligence
Yuanjie Xia, Mohamed Khamis, F. Anibal Fernandez, Hadi Heidari, Haider Butt, Zubair Ahmed, Tim Wilkinson, Rami Ghannam
Summary: Recent advances in microelectronics and nanofabrication on flexible substrates have enabled contact lenses to be used for a range of human-machine interaction applications. A systematic review reveals that smart contact lenses can display information, detect eye movements, restore vision, and detect biomarkers in tear fluid. The study also classifies literature on smart contact lenses and speculates on their challenges and opportunities for HMI, providing guidelines for future design.
IEEE TRANSACTIONS ON HUMAN-MACHINE SYSTEMS
(2023)
Article
Nanoscience & Nanotechnology
Andreas T. D. Richardson, Shavaiz I. Mir, Stephen M. Morris, Steve J. Elston, Ali K. Yetisen, Yunuen Montelongo
Summary: A simulation framework is developed for modeling multilayer photonic crystal structures using the two-dimensional finite-difference time-domain method. The framework includes the recording process and subsequent interrogation with a broadband spectrum. Various parameters such as film thickness, refractive index contrast, film expansions, and lattice spacings are considered in the simulations. The parallelization method is implemented to alleviate the computational demand.
JOURNAL OF NANOPHOTONICS
(2023)
Review
Materials Science, Multidisciplinary
Mujeeb Kareem, Taofeeqah Agbaje, Fahad Alam, Haider Butt
Summary: Smart contact lenses are developed to sense and treat diseases like intraocular pressure and glaucoma using tear fluid. This report reviews the processing of thin films to develop functional characteristics for their application in smart contact lenses. It discusses the types of thin films used, as well as various applications, from historical developments to the latest technologies related to thin films in smart contact lenses. Lastly, it presents challenges with contact lenses and improvements using thin films to overcome these challenges.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Israr Ahmed, Mohamed Elsherif, Murad Ali, Amal Al Ghaferi, Baker Mohammad, Haider Butt
Summary: Diabetes is a leading cause of death worldwide. Developing low-cost, rapid, and reusable sensors can provide a solution for continuous glucose monitoring to reduce the potentially fatal complications of diabetes. In this study, Phenylboronic acid (PBA)-based hydrogel sensors with embedded photonic nanostructures were developed for rapid and continuous glucose quantification within the physiological range.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Analytical
Israr Ahmed, Murad Ali, Haider Butt
Summary: This study used diffusive reflection spectroscopy to investigate the effect of probe pressure on human skin and nails. The findings showed that different tissues have specific responses to pressure, and the intensity of the oxyhemoglobin peak varies with different skin tones. The results have important implications for relevant applications.
Article
Materials Science, Biomaterials
Muhammed Hisham, Ahmed E. E. Salih, Haider Butt
Summary: 3D printing of multimaterial objects is a promising field with various applications. In this study, multimaterial contact lenses were produced using vat photopolymerization-based 3D printing, offering enhanced optical filtration for tackling ocular conditions like color blindness.
ACS BIOMATERIALS SCIENCE & ENGINEERING
(2023)
Article
Chemistry, Physical
Murad Ali, Fahad Alam, Haider Butt
Summary: The ongoing advancements in additive manufacturing (AM) techniques are transforming the production of 3D parts, particularly with the rapid, efficient, and cost-effective nature of 3D printing. Researchers have successfully fabricated five-dimensional (5D) Fresnel lenses using masked stereolithography (MSLA) and incorporating thermochromic powder and diffraction gratings. These lenses demonstrate good optical focusing performance in the visible light wavelength range, with some deviation in the near infrared region. This study presents promising applications in the field of optical components.
