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Congratulations for our new Paper in Journal Of ACS Applied Nano Materials

Congratulations for our new Paper in Journal Of ACS Applied Nano Materials:

Plasmonic Eyeglasses Based on Gold Nanoparticles for Color Vision Deficiency Management
N. Roostaei and S. M. Hamidi*

Color vision deficiency (CVD), or color blindness, is a common ocular disorder that prohibits the recognition of different colors, from which many people suffer worldwide (8-10% of males and 0.4-0.5% of females). Despite numerous efforts, no definitive cure for color blindness has yet been discovered, but many color filter-based aids such as tinted glasses and contact lenses have been developed to help color blind people. This work is the first to fabricate plasmonic eyeglasses based on gold nanoparticles using two innovative methods, i.e., the simple self-assembly technique and heat treatment of gold thin films, and to evaluate them for color blindness management. The proposed plasmonic eyeglasses were simulated using the finite-difference time-domain (FDTD) method, and a good agreement between experimental and simulation results was obtained. The proposed plasmonic eyeglasses based on gold nanoparticles are more selective than commercial Enchroma and VINO glasses because of the tunability of plasmonic properties of gold NPs by controlling their morphology, which provides insights for applications of color vision deficiency improvement.

کارگاه آموزش نرم افزار طراحی اپتیکی زیمکس

پژوهشکده لیزر و پلاسمای دانشگاه شهید بهشتی کارگاه آموزشی نرم افزار طراحی سامانه های اپتیکی

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سمینار آشکارسازهای تک فوتون

سالن آمفی تئاتر پژوهشکده لیزر و پلاسمای دانشگاه شهید بهشتی تهران

بیست و نهم آبان ماه 1401

News On Plasmonic Switches

In these days, the Journal of Plasmonics published a new paper entitled as “Switchable Gratings for Ultracompact and Ultrahigh Modulation Depth Plasmonic Switches”

Plasmonic interconnects present a compact platform for high modulation-depth optical switches. Conventional plasmonic switching approaches depend on modifying the dispersion of the surface plasmon polariton (SPP) wave at the metal/dielectric interface. Here, we introduce a novel scheme for ultracompact and high modulation depth (MD) plasmonic switching using a phase-change material-based switchable grating consisting of antimony trisulfide (Sb2S3). In its ON state, the switchable grating excites surface plasmon polaritons (SPP) and bulk plasmon polaritons (BPPs) in plasmonic films and hyperbolic metamaterials (HMMs), respectively. The SPP switch has a footprint of 23.1 µm2 and a MD of up to 40 dB. The BPP switch has a footprint of 13.12 μm2 and a MD of 29.7 dB. The BPP switch enjoys a broadband MD from 299 to 375 THz. Concurrently, we show that the same switchable grating on plasmonic film and on HMM is a refection-based optical switch. Finally, we present a novel scheme for non-local control over the spontaneous emission rate and out-coupled power from emitters embedded in HMMs.

Congratulations for our new paper in Journal Of Nanoscale

امیترهای تراهرتز اسپینترونیکی بهینه مبتنی بر نانوساختارهای فرومغناطیسی
غیرمغناطیسی

سیده مریم حسینی، سیده مهری حمیدی* ، فاضل جهانگیری

چکیده: تابش الکترومغناطیسی تراهرتز برای کاربردهای فراوانی از جمله تصویربرداری و طیف سنجی سودمند است. در این مقاله، امیتر دولایه ای Fe/Pt ،Glass ،sapphireبا توجه به ضخامت لایه ها بهینه شد و با مدلسازی میدان تابشی تراهرتز، تاثیر زیرلایه های
Tungstenو MgOبر ضخامت بهینه امیتر تراهرتز اسپینترونیکی Fe/Ptبررسی شد. مدل استفاده شده در این مقاله، قطبش اسپینی،
.پخش و تجمع اسپینی و ویژگی های الکتریکی و نوری لایه ها را در نظر میگیرد

Congratulations for our new paper in Journal of Applied Physics A

The bull’s‑eye structure as a new plexcitonic circular grating

T. Mahinroosta, S. M. Hamidi*

We theoretically demonstrate the strong coupling between plasmons and excitons in the plexcitonic circular grating. The J-aggregate molecules, as one of the excitonic materials, have unique optical properties, which is an excellent choice for a wide range of optoelectronic applications. In this hybrid system, the J-aggregate thickness and position has important role in exciton-plasmon coupling. For this reason, we consider two different plasmonic hybrid structures as the Au core@shell, and circular grating. Our results illustrate that, the Rabi splitting values for Au core @ J-aggregate layer is calculated to be 118 meV and for the Au core–J-aggregate layer–Au layer rach to 128 meV which is confimes that plexcitonic circular grating shows stronger couplings than the plexcitonic core@shell structure.

Congratulations for our new paper in Journal of Optics Communications

Highly sensitive surface plasmon resonance sensor for detection of Methylene Blue and Methylene Orange dyes using NiCo-Layered Double Hydroxide

Amir RezaSadrolhosseini, EbrahimGhasami, AzamPirkarimi, Seyedeh MehriHamidi, RezaTaheri Ghahrizjani

Surface plasmon resonance (SPR) sensor is a versatile technique to detect toxic materials in the environment. In this study, the SPR technique was used to detect the environmental contaminant dyes such as methylene blue (MB) and methylene orange (MO). The surface of the gold layer was modified using NiCo-layered double hydroxide (LDH) which was fabricated with the electrodeposition method and characterized using field emission scanning electron microscopy, X-ray diffraction spectroscopy, and transmission electron microscopy. The thickness of LDH was controlled by deposition time and a homogeneous coating of LDH was obtained in the short time range of less than 150s. The adsorption of MB and MO on LDH was studied using the SPR technique based on angular modulation. Langmuir adsorption isotherm was fitted for data of adsorbents and the adsorption mechanism was described. The sensor limit and the response time were about 0.005 ppm and 268 s, respectively. It was proved that the sensitivity of the sensor can be controlled by the thickness of the LDH layer. Results indicated that the glass/Au/ NiCo-LDH system is fast and efficient for the detection of the MB and MO dyes in a short time.

News On Quantum Sensing

Engineering atomic antennas for quantum sensing

Jennifer Choy makes atom-size antennas. They bear no resemblance to the telescoping rod that transmits pop hits through a portable stereo. But functionally, they’re similar. They’re quantum sensors, picking up tiny electromagnetic signals and relaying them in a way we can measure.

How tiny a signal? A quantum sensor could discern temperature changes in a single cell of human tissue or even magnetic fields originating at Earth’s core.

Jennifer Choy, a scientist at the University of Wisconsin–Madison, is developing technologies that could lead to ultraprecise accelerometers and magnetometers for navigation and for probing minuscule changes in a material’s electromagnetic fields.

“You can think of these quantum sensors as an atomic scale probe that allows you to be sensitive to and measure really localized changes in magnetic fields,” Choy said. “And you can extend your measurements to probe macroscopic magnetic features and other physical parameters like mechanical strain and temperature.”

Taking advantage of atoms’ quantum nature—which reveals itself only at nature’s smallest scales—and their sensitivity to external disturbances, these sensors exhibit extraordinary accuracy and precision, making their traditional counterparts look like blunt instruments by comparison.

For Choy, the challenge is to boost the efficiency with which these invisible instruments transmit information. The research is equal parts physics discovery and engineering, she says.

“I find the work exciting because it’s a good fit for the kind of hodgepodge training that I had,” said Choy, who is a member of both Q-NEXT, a U.S. Department of Energy (DOE) National Quantum Information Science Research Center led by DOE’s Argonne National Laboratory, and the National Science Foundation’s Quantum Leap Challenge Institute for Hybrid Quantum Architectures and Networks, or HQAN. “I’m an applied physicist by training, and I don’t categorize myself as purely a physicist or engineer. But I really enjoy that intersection of fundamental science and engineering work.”

Light and matter

Choy works on quantum sensors in which electrons in quantum materials act as the antenna. The information they pick up can be read through their interactions with photons, the massless particles that carry electromagnetic information.

For more details, refer to the link below:

phys.org/news/2022-08-atomic-antennas-quantum.html

News On Bio-Contact Lenses

In this days, the Journal of ACS Appl. Polym. Mater. published a new paper entitled as “Pressure-Triggered Microfluidic Contact Lens for Ocular Drug Delivery”

Microfluidic technology has been used for precise drug delivery for many years, but microfluidic wearable devices have mostly been used for skin drug delivery. The application of eye drops is currently one of the most common ways to treat eye diseases. However, due to their low corneal bioavailability and short residence time in tears, topical eye drops must be applied multiple times a day. Contact lenses, as a wearable device for the eye, are a good platform for drug delivery. In this paper, we propose a type of microfluidic contact lens that integrates a microchannel and a micropump and uses a pressure source to trigger the release of a drug. Here, a flat microfluidic chip component is first fabricated by photolithography and then cast into a curved surface by secondary thermosetting. Through experiments, the outlet check valve opening pressure and liquid flow test were studied to prove that the liquid release is controllable. In addition, the microfluidic contact lens has good flexibility, light transmittance, and biocompatibility. Finally, we demonstrate through fluorescence experiments that the microfluidic contact lens can be loaded with different types of drugs in different regions. In general, liquid exchange between the eye and the contact lens can be realized through the mechanical action of blinking without using electronic components, meaning more safety and stability. The mechanical characteristics of a blink can be artificially regulated to a large extent; thus, it is also possible to achieve specific, personalized medicine.

Congratulations for our new paper in Journal of Sensors and Actuators A: Physical

Ketamine Plasmonic Sensor Using Polyaniline-rGO-Fe3O4 Nanocomposite Thin Layer

Amir Reza Sadrolhosseini, Seyedeh Mehri Hamidi*, Mahmood Kazamzad, Ali Rafiei, Farnaz Amouyan, Somayeh Sadeghi

Ketamine is a narcotic and palliative substance and the measurement of the low concentration of ketamine is a great intense interest matter in biotechnology and medicine. The surface plasmon resonance imaging method can monitor the low concentration of bio-substance such as ketamine and dopamine. The reduced graphene oxide-Fe3O4 nanoparticles and polyaniline-reduced graphene oxide-Fe3O4 nanocomposite layers as the sensing layer were prepared using sonication and electro-deposition methods, respectively. The average particle size of Fe3O4 was 38.53 nm, and the sensing layer thickness was in the range of 19 to 24.5 nm. The morphology, functional group, and contribution of chemical elements were investigated using field emission electron microscopy; Fourier transforms infrared spectroscopy, and energy-dispersive X-ray spectroscopy, respectively. The surface plasmon resonance imaging pattern confirmed that the minimum concentration for detecting ketamine, the sensitivity of the sensor, and the response time were about 0.1 mg/L, 0.044, and 220 s, respectively. The affinity constant is 11.19 for the detection of ketamine, and the tendency of the sensing layer to bind the ketamine is higher than dopamine and glucose.