Magnetoplasmonics Lab
News on crystal magnetic sensor

A novel Bloch surface wave (BSW)-based one-dimensional photonic crystal magnetic sensor is proposed. Gratingis used to realize the coupling of electromagnetic waves and BSW, and magnetic fluid is placed at the bottom ofthe sensor as the sensing medium. The sensing characteristics of a one-dimensional photonic crystal magneticsensor were analyzed using the rigorous coupled wave analysis (RCWA) method. Based on the azimuthalinterrogation method, the effects of different pole angles, defect layers, and structural parameters on sensitivityand figure of merit (FOM) were investigated. According to the drift of the resonance peak, the azimuthalsensitivity S = 9 ◦/mT, and the maximum detection sensitivity S = 14 ◦/mT were obtained (converted torefractive index sensitivity S = 6536 ◦/RIU and maximum detection sensitivity S = 9333 ◦/RIU). Excitingly, wefound that the introduction of a defective layer can significantly improve the FOM (1925 RIU− 1 to 69,444RIU− 1). The results show that the designed magnetic sensor structure has high sensitivity and a high FOM, whichis an order of magnitude higher than other magnetic sensors. This work provides a guideline for the futuredevelopment of one-dimensional photonic crystals in the field of weak magnetic sensing.

News on Plasmonic Perovskite Solar Cell
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The first winter school of quantum photonic technologies to present new opportunities of quantum optics technology and design roadmap for young talented researchers

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News on Actively Controlled Atomic Filter
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Abstract

Precise wind velocity measurements are of interest for a variety of applications including weather forecasting and detection of clean air turbulence and wind shear. This work investigates a concept known as spectral hole burning to create an actively tunable atomic vapor filter in order to improve the resolution of LIDAR wind velocity profiling. By adjusting the frequency and intensity of a pump beam in an alkali vapor cell, steep slopes in the transmission profile may be used to monitor shifts in frequency of a probe beam. A three-level atomic model to simulate the spectral hole is described and validated experimentally through pump-probe spectroscopy. The model then optimizes parameters including cell length, cell temperature, pump intensity and pump frequency to find the steepest transmission slope obtainable. At this location, frequency resolutions of 0.69 MHz are predicted per 1% change in transmission, corresponding to a 0.27 m/s velocity sensitivity. From this information, the feasibility and limitations of using spectral hole burning as a controllable atomic filter for LIDAR velocimetry measurements are discussed.

This Figure shows the possible mechanisms for atoms to transfer between states that are considered in the model.

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News on 1D photonic crystals
In these days, the journal of Faraday Discussions published a paper entitled as “Integration of bio-responsive silver in 1D photonic crystals: towards the colorimetric detection of bacteria"

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Abstract

The colour purity and versatility of fabrication of one-dimensional photonic crystals (1D PhCs) make them ideal candidates for colorimetric sensing of a variety of analytes. For instance, the detection of bacterial contaminants in food via colorimetric sensors can be highly appealing, as most of the existing detection techniques are in general time-consuming and the read-out requires specialised personnel. Here, we present a colorimetric sensor based on hybrid plasmonic/photonic 1D crystals. We demonstrate that the modification of the silver plasmon resonance brought about by the effective silver/bacterium interaction can be translated into the visible spectral region, producing a change in the structural colour. In addition, we observe a superior colorimetric sensitivity against the Gram negative Escherichia coli compared to the Gram positive Micrococcus luteus, a result that we attribute to the more efficient electrostatic interaction and cellular adhesion between the silver surface and the Gram-negative bacteria outer membrane. This approach demonstrates that in principle an easy colorimetric detection of bacterial contaminants can be achieved through the use of bio-responsive plasmonic materials, such as silver, whose selective electrostatic interaction with bacterial cell wall is well-known and occurs without the need of chemical functionalisation.

Graphical abstract: Integration of bio-responsive silver in 1D photonic crystals: towards the colorimetric detection of bacteria
📢 حضور شرکت در بیست و چهارمین جشنواره پژوهشی ابوریحان 📢
بیست و چهارمین جشنواره پژوهشی ابوریحان بیرونی سوم دی‌ماه با حضور جمعی از مسئولان، اساتید و پژوهشگران در دانشگاه .علوم پزشکی شهید بهشتی برگزار و منتخبان این دوره از جشنواره معرفی شدند

در این نمایشگاه شرکت به منظور تقویت ارتباط صنعت با دانشگاه و شبکه سازی حسگر تمام اتوماتیک پلاسمونی ساخت شرکت حسگرسازان نور گستر (پلاسنس) خود را ارائه کرد که واقع یک چیدمان اپتیکی آزمایشگاهی بصورت دستگاه جمع شده است که در صنایع مختلف مانند صنایع غذایی، دارویی و حوزه های زیست پزشکی برای کاربردهای حسگری مورد استفاده قرار میگیرد.

📢 سخنرانی خانم حانیه جاراللهی در اولین رویداد حل مسئله و همایش ملی علوم و فناوری‌های همگرا و کوانتومی 📢
📢 حضور شرکت در اولین رویداد حل مسئله و همایش ملی علوم و فناوری‌های همگرا و کوانتومی 📢
اولین رویداد حل مسئله و همایش ملی علوم و فناوری‌های همگرا و فناوری‌های کوانتومی با حضور دکتر محمدمهدی طهرانچی رئیس دانشگاه آزاد اسلامی، دکتر جمشید صباغ‌زاده قائم مقام رئیس دانشگاه آزاد اسلامی در واحد علوم و تحقیقات و جمعی از اندیشمندان و پژوهشگران حوزه فناوری‌های همگرا و کوانتومی در مجتمع دانشگاهی آیت‌الله هاشمی‌رفسنجانی واحد تهران مرکزی برگزار شد.

در این رویداد شرکت توسعه حسگرسازان نورگستر در راستای افزایش شبکه‌سازی و برقراری همکاری‌های علمی و فناورانه بین بخش‌های دانشگاهی و صنعتی کشور در نمایشگاه شرکت نموده و به ارائه محصولات و خدمات خود پرداخت.

از محصولات ارائه شده در نمایشگاه میتوان به حسگر تمام اتوماتیک پلاسمونی و سلول بخار اتمی روبیدیوم اشاره کرد و در رابطه با حسگرکوانتومی با استفاده از بخار گرم روبیدیوم،ساعت اتمی بخار گرم روبیوم و حسگر های پلاسمونیک توضیح داده شد.

فراخوان پذیرش دانشجوی دکتری تخصصی بدون آزمون آزمایشگاه مگنتوپلاسمونیک دانشگاه شهید بهشتی ۱۴۰۳-۱۴۰۲
آزمایشگاه مگنتوپلاسمونیک پژوهشکده لیزر و پلاسما دانشگاه شهید بهشتی بر اساس آئین‌نامه‌ی «پذیرش بدون آزمون استعدادهای درخشان در دوره ی تحصیلی دکتری تخصصی» وزارت علوم، تحقیقات و فناوری و به منظور تسهیل ادامه تحصیل برگزیدگان علمی، از بین دانش آموختگان و دانشجویان ممتاز دوره‌های کارشناسی ارشد دانشگاه های مشمول این فراخوان در شته فوتونیک، حوزه اتمی و کوانتومی دانشجو می پذیرد.
News on glucose biosensors
In these days, the journal of Nano Materials Science published a paper entitled as “Nanomaterial-assisted wearable glucose biosensors for noninvasive real-time monitoring: Pioneering point-of-care and beyond

This review explores glucose monitoring and management strategies, emphasizing the need for reliable and user-friendly wearable sensors that are the next generation of sensors for continuous glucose detection. In addition, examines key strategies for designing glucose sensors that are multi-functional, reliable, and cost-effective in a variety of contexts. The unique features of effective diabetes management technology are highlighted, with a focus on using nano/biosensor devices that can quickly and accurately detect glucose levels in the blood, improving patient treatment and control of potential diabetes-related infections. The potential of next-generation wearable and touch-sensitive nano biomedical sensor engineering designs for providing full control in assessing implantable, continuous glucose monitoring is also explored. The challenges of standardizing drug or insulin delivery doses, low-cost, real-time detection of increased blood sugar levels in diabetics, and early digital health awareness controls for the adverse effects of injectable medication are identified as unmet needs. Also, the market for biosensors is expected to expand significantly due to the rising need for portable diagnostic equipment and an ever-increasing diabetic population. The paper concludes by emphasizing the need for further research and development of glucose biosensors to meet the stringent requirements for sensitivity and specificity imposed by clinical diagnostics while being cost-effective, stable, and durable.