Color blindness, also known as color vision deficiency (CVD), is a prevalent ocular disorder that hinders distinguishing different colors, a challenge experienced by a considerable portion of the global population (8−10% of males and 0.4−0.5% of females). CVD patients are frequently restricted from crucial professions such as military or police, and cannot recognize colors in public places or media like watching TV. Despite ongoing efforts, there is no definitive cure for color blindness; however, various color filter-based devices such as tinted glasses and contact lenses have been introduced to assist CVD people. Recently, plasmonic nanostructures have attracted significant attention for CVD management by replacing chemical dyes due to their outstanding properties and the adjustability of plasmonic resonances. This study reviews the different wearables utilized in CVD management, such as eyeglasses and contact lenses, with a special emphasis on the innovative plasmonic eye wearables that have emerged in recent advances. The capability to modify the plasmonic properties by manipulating their morphology provides novel perspectives for CVD management and smart ophthalmic wearables.
Congratulations for our new paper in The European Physical Journal Plus:
Plasmonic nanostructures for color vision deficiency (CVD) management
N. Roostaei, S. M. Hamidi
Color blindness, also known as color vision deficiency (CVD), is a prevalent ocular disorder that hinders distinguishing different colors, a challenge experienced by a considerable portion of the global population (8−10% of males and 0.4−0.5% of females). CVD patients are frequently restricted from crucial professions such as military or police, and cannot recognize colors in public places or media like watching TV. Despite ongoing efforts, there is no definitive cure for color blindness; however, various color filter-based devices such as tinted glasses and contact lenses have been introduced to assist CVD people. Recently, plasmonic nanostructures have attracted significant attention for CVD management by replacing chemical dyes due to their outstanding properties and the adjustability of plasmonic resonances. This study reviews the different wearables utilized in CVD management, such as eyeglasses and contact lenses, with a special emphasis on the innovative plasmonic eye wearables that have emerged in recent advances. The capability to modify the plasmonic properties by manipulating their morphology provides novel perspectives for CVD management and smart ophthalmic wearables.
Researchers have discovered a way to recycle the tiny particles used to create supraparticle lasers, a technology that precisely controls light at a very small scale. The breakthrough could help manage these valuable materials in a more sustainable way.
Supraparticle lasers work by trapping light inside a tiny sphere made of special particles called quantum dots, which can absorb, emit, and amplify light very efficiently.They are made by mixing quantum dots in a solution that helps them stick together in tiny bubbles. However, not all attempts succeed, and even successful lasers degrade over time. This leads to wasted materials, which can be expensive.
Recycling method
The idea to recycle these particles came up during a team discussion about the high cost of wasted quantum dots. Dillon Downie, a Ph.D. student in the Institute of Photonics at the University of Strathclyde, suggested a potential solution, and with the support of team leader Dr. Nicolas Laurand, they tested the idea. To their surprise, they were able to recover and reuse the particles to make new lasers.
Dillon said, “Supraparticle lasers are already beginning to be used for targeted drug delivery and sensing applications, as well as for components in compact electronic systems. Nanoparticle aggregates and supraparticle lasers are expected to play an increasingly prominent role in everything from wearable medical devices to ultrabright LEDs.
“Our recycling method reduces costs and environmental impact by minimizing the need for new nanoparticles and the disposal of old ones, and it should be applicable to any colloidal nanoparticle species, especially rare-earth ones.”
In a paper titled “Recycling self-assembled colloidal quantum dot supraparticle lasers,” published in the journal Optical Materials Express, the Strathclyde researchers describe how they recycled quantum dots from used lasers to make new ones that work just as well as the originals.
Dillon said, “We envision this method being used to extend the life cycle of supraparticles, which could be repurposed for various applications such as medical biosensors, representing a significant advance toward sustainable nanoengineering.”
Simple method
The recycling process starts by breaking apart the used lasers by heating the particles and exposing them to sound waves. The quantum dots were then separated from impurities using a mix of oil and water, followed by filtering and coating the particles to restore their properties. Finally, the research team tested the recycled dots to ensure they could still emit light effectively and used them to create new lasers.
This method recovered 85% of the original quantum dots, which still performed almost as well as new ones. The recycled dots were then used to make lasers that worked just like the originals.
The team plans to study how recycling affects the performance of the quantum dots over time and to develop ways to recycle more complex or specialized particles.
Dillon added, “Our simple method doesn’t need fancy equipment, so it can be used in most labs. This is a big step toward making advanced materials more sustainable.”
Shahid Beheshti University’s magnetoplasmonics laboratory unveiled the first Iranian atomic clock in the fifth photonics and laser exhibition of Iran in 4th November of 2024. This laboratory started its activity a few years ago in the field of construction and design of atomic steam cells and also has the history of building the first Iranian rubidium atomic steam cell in its portfolio. This atomic clock based on rubidium atom vapor cell with microwave stimulation is the first atomic clock made in Iran. Dr.Hamidi, the professor of Shahid Beheshti university , is the supervisor of this project.
Recent Applications of Quantum Plasmonic Techniques for Detection of Toxic Materials
Amir Reza Sadrolhosseini, Seyedeh Mehri Hamidi
The quantum plasmonic sensor is a new versatile technique for detecting toxic chemicals and biomolecules. The quantum plasmonic feld is a newfound in the plasmonic feld, and it develops plasmonic sensors, plasmonic antennae, and plasmonic solar cells. In this study, the interaction of plasmon-photon was reviewed beside the nanostructure, and the Lagrangian and Hamiltonian were presented to explain the coupling and emitter into plasmonic and beta factors. The squeezed light genera- tion and the type of quantum plasmonic sensors method were considered for detecting the toxic chemicals and biomolecules. The quantum plasmonic method based on quantum dots and nitrogen vacancy center in the diamond lattice was expressed to fnd the best material for the investigation of the quantum plasmonic sensor.
In these days, the Journal of Scientific Reports published a new paper entitled as “Angular surface plasmon resonance‑based sensor with a silver nanocomposite layer for effective water pollution detection”
For sensing various samples of polluted water and various sodium chloride concentrations using an angular surface plasmon resonance (ASPR), we have introduced a conventional structure and a hybrid heterostructure in the current research. The suggested structures are composed of silver metal, dielectric layers, silver nanocomposite, and a sensing medium. The refectance spectra of all structures in the visible region were obtained through the utilization of the transfer matrix method by using the angular interrogation method depending on the Kretschmann confguration. Through our findings, five substrate parameters have been optimized to attain the utmost level of sensitivity across all structures: the thickness of Ag-metal, the type and thickness of dielectric materials, the host material type and the volume fraction of nanoparticles for the nanocomposite layer. In this regard, the suggested sensor provides excellent performance with a sensitivity of 448.1°/RIU, signal-to-noise ratio of 0.787, sensor resolution of 0.284°, and figure of merit of 78.766 RIU−1. Therefore, we believe that the introduced design of our ASPR sensor presents a good candidate for an accurate and effcient detection of low concentrations of contaminated water and sodium chloride as well.
In these days, the journal of Sensors published a new paper entitled as “New Biosensor for Determination of Neuropilin-1 with Detection by Surface Plasmon Resonance Imaging“
Abstract: Neuropilin-1 is transmembrane protein with soluble isoforms. It plays a pivotal role in both physiological and pathological processes. NRP-1 is involved in the immune response, formation of neuronal circuits, angiogenesis, survival and migration of cells. The specific SPRI biosensor for the determination of neuropilin-1 was constructed using mouse monoclonal antibody that captures unbound NRP-1 form body fluids. The biosensor exhibits linearity of the analytical signal between 0.01 and 2.5 ng/mL, average precision value 4.7% and recovery between 97% and 104%. The detection limit is 0.011 ng/mL, and the limit of quantification is 0.038 ng/mL. The biosensor was validated by parallel determination of NRP-1 in serum and saliva samples using the ELISA test, with good agreement of the results.
Strong driving to realize super-Bloch oscillations
Full coherent control of wave transport and localization is a long-sought goal in wave physics research, which encompasses many different areas from solid-state to matter-wave physics and photonics. One among the most important and fascinating coherent transport effects is Bloch oscillation (BO), which refers to the periodic oscillatory motion of electrons in solids under a direct current (DC)-driving electric field. Super-Bloch oscillations (SBOs) are giant oscillatory motions achieved by applying simultaneously detuned DC- and AC-driving electrical fields. Considered amplified versions of BOs, SBOs receive less attention than ordinary BOs mainly because their experimental observations are more challenging and require a much longer particle coherence time.
One unique feature of SBOs is the existence of coherent oscillation inhibition through an AC-driving renormalization effect, which manifests as the localization of an oscillation pattern with a vanishing oscillation amplitude. Dubbed the “collapse” of SBO, this interesting phenomenon typically occurs in the strong AC-driving regime, which hasn’t been reached in previous experiments of SBOs based on electronic and other systems. All present theoretical and experimental studies on SBOs have been limited to the simplest sinusoidal AC-driving cases, so the SBO collapse under more general AC-driving formats, and the ability to harness SBOs for flexible coherent wave manipulation, also remain unexplored.
Congratulations on publishing our selected article in the MDPI book “1D and 2D Nanomaterials for Sensor Applications”
Our selected Paper: “Colorimetric Plasmonic Hydrogen Gas Sensor Based on One-Dimensional Nano-Gratings“
Majid Zarei, Seyedeh M. Hamidi and K. -W. -A. Chee
MDPI Books offers quality open access book publishing to promote the exchange of ideas and knowledge in a globalized world. MDPI Books encompasses all the benefits of open access – high availability and visibility, as well as wide and rapid dissemination. With MDPI Books, you can complement the digital version of your work with a high quality printed counterpart.
Detection of gentamicin in water and milk using chitosan-ZnS-Au nanocomposite based on surface plasmon resonance imaging sensor Amir Reza Sadrolhosseini, Seyedeh Mehri Hamidi⁎, Younes Mazhdi
The detection of antibiotics in milk, water, and agricultural products is a topic of interest for health care and environmental protection. Some antibiotics such as oxytetracycline and gentamicin are the prominent contaminants in water and milk. In this study, the chitosan-ZnS and chitosan-ZnS-Au nanocomposites were fabricated using a laser ablation technique. The nanocomposites were covered on the glass substrate as a layer sensor characterized by analytical methods. Consequently, the thickness of layers was in the range of 36.3 to 38.21 nm. The surface plasmon resonance image patterns demonstrated the interaction of the gentamicin and oxytetracycline with nanocomposites. As a result, the sensor is sensitive to detect gentamicin, and the limit of detection, the affinity constant, and response time were about 0.1 ppm, 102.04 a.u., and 268 s respectively.
