A5014521625- Advanced biosensing and bioanalysis techniques
- Plasmonic and Surface Plasmon Research
- Graphene research and applications
- Nanopore and Nanochannel Transport Studies
- Photonic and Optical Devices
- Graphene and Nanomaterials Applications
- Advanced Sensor and Energy Harvesting Materials
- Advanced Photonic Communication Systems
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Fiber Optic Sensors
- Nanowire Synthesis and Applications
- Antenna Design and Analysis
- Metamaterials and Metasurfaces Applications
- Semiconductor Lasers and Optical Devices
- Nanomaterials for catalytic reactions
- Orbital Angular Momentum in Optics
- Magnetic Properties and Synthesis of Ferrites
- Analytical Chemistry and Sensors
- Advanced Antenna and Metasurface Technologies
- 3D Printing in Biomedical Research
- Innovative Microfluidic and Catalytic Techniques Innovation
- Advanced Materials and Mechanics
- Microwave Engineering and Waveguides
- 2D Materials and Applications
- Molecular Junctions and Nanostructures
Gachon University
2024
Sharif University of Technology
2024
Tarbiat Modares University
2016-2023
University of Illinois Urbana-Champaign
2020-2021
University of Zanjan
2019
Abstract Field-effect transistor (FET)-based biosensors allow label-free detection of biomolecules by measuring their intrinsic charges. The limit these sensors is determined the Debye screening charges from counter ions in solutions. Here, we use FETs with a deformed monolayer graphene channel for nucleic acids. These devices even millimeter scale channels show an ultra-high sensitivity buffer and human serum sample down to 600 zM 20 aM, respectively, which are ∼18 ∼600 acid molecules....
Universal platforms for biomolecular analysis using label-free sensing modalities can address important diagnostic challenges. Electrical field effect-sensors are an class of devices that enable point-of-care by probing the charge in biological entities. Use crumpled graphene this application is especially promising. It previously reported limit detection (LoD) on electrical effect-based sensors DNA molecules FET (field-effect transistor) platform. Here, FET-based biosensing biomarkers...
Abstract Enzymatic DNA amplification‐based approaches involving intercalating DNA‐binding fluorescent dyes and expensive optical detectors are the gold standard for nucleic acid detection. As components of a simplified miniaturized system, conventional silicon‐based ion sensitive field effect transistors (ISFETs) that measure decrease in pH due to generation pyrophosphates during amplification have been previously reported. In this article, Bst polymerase loop‐mediated isothermal (LAMP)...
Tiny silicon microchip–based high-throughput hanging drop arrays allow drug screening and geometric control.
Abstract This review paper comprehensively analyzes recent advancements in optical fiber‐based biosensors, focusing on conventional fiber and photonic crystal structures. overviews the significant applications of including bioimaging, quality analysis, food safety, field environment monitoring, setting stage for subsequent discussions. The primary objective is to systematically evaluate literature concerning emphasizing their sensitivities resolutions. second section explores integrating...
Abstract The reversible insulating-to-conducting phase transition (ICPT) of vanadium dioxide (VO 2 ) makes it a versatile candidate for the implementation integrated optical devices. In this paper, bi-functional in-line device based on four-layer stack PMMA/graphene/VO /graphene deposited side-polished fiber (SPF) is proposed. structure can be employed as an ultra-compact TE modulator or TM-pass polarizer, operating at 1.55 μm. We show that ICPT characteristic used polarization-selective...
Abstract The article details the development and production of an ultra‐wideband discrete single‐pole‐double‐throw (SPDT) Switch, measuring , functioning within 23.4–31 GHz frequency range, encompassing 24 28 GHz. This switch is specifically engineered to bolster high‐frequency systems in automotive fifth‐generation applications. Our findings demonstrate that SPDT performs on par with integrated circuits while delivering consistent performance throughout its spectrum. Furthermore, it offers...
In this study, we have reported the green synthesis magnesium ferrite using tragacanth gel by sol-gel method without any organic chemicals. The sample was characterized powder X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), vibrating magnetometer (VSM) and scanning electron microscopy (SEM). (XRD) analysis revealed formation of cubic phase MNPs. Magnetic showed that MgFe2O4 had a superparamagnetic behavior with saturation magnetization 14 emu/g at room temperature....
Rapid, accurate, and label-free detection of biomolecules chemical substances remains a challenge in healthcare. Optical biosensors have been considered as biomedical diagnostic tools required numerous areas including the viruses, food monitoring, diagnosing pollutants environment, global personalized medicine, molecular diagnostics. In particular, broadly emerging promising technique surface plasmon resonance has established to provide real-time when used biosensing applications highly...
In this paper, we present a set of optimal graphene-based multilayer surface plasmon resonance (SPR) biosensors for highly sensitive detection biomolecules. To optimize the biosensor structure, employed multi-objective gray wolf optimizer (MOGWO) to maximize sensitivity and minimize structure full width at half maximum (FWHM). The main advantages optimized structures are high sensitivity, low FWHM, as well easy implementation. We developed an algorithm that enables us achieve nine different...
We propose novel nano-plasmonic-based structures for rapid sequencing of DNA molecules. The optical properties nucleotides have notable differences in the ultraviolet (UV) region light. Using nanopore, bowtie, and bowtie-nanopore compound structures, probable application surface plasmon resonance (SPR) is investigated by employing discrete dipole approximation method. effects different materials like chromium (Cr), aluminum (Al), rhodium (Rh), graphene (Gr) are studied. show that...
We propose a new DNA sensing mechanism based on optical properties of graphene oxide (GO) and molybdenum disulphide (MoS2) nanopores. In this method, GO MoS2 is utilized as quantum dot (QD) nanopore molecule translocate through the nanopore. A recently-developed hybrid quantum/classical method (HQCM) employed which uses time-dependent density functional theory quasi-static finite difference time domain approach. Due to good biocompatibility, stability excitation wavelength dependent emission...
<title>Abstract</title> We present a nano-corrugation graphene (NCGr)-based device, which can support diverse detection strategies. A single NCGr device exhibit three different modes of biomolecular sensing: electrolyte-gated field-effect transistor (FET) sensing, electrochemical and sensing based on surface-enhanced Raman spectroscopy (SERS). Each mode produces reliable signals with extremely high sensitivity for DNA hybridization (analyte concentrations < 10 fM). The charge-transfer...
We propose surface plasmon resonance biosensors based on crumpled graphene and molybdenum disulphide (MoS 2 ) flakes supported stretchable polydimethylsiloxane (PDMS) or silicon substrates. Accumulation of specific biomarkers resulting in measurable shifts the wavelength modes two-dimensional (2D) material structures, with structures demonstrating large refractive index shifts. Using theoretical calculations semiclassical Drude model, combined finite element method, we demonstrate that...
We propose a novel, to the best of our knowledge, plasmonic-based methodology for purpose fast DNA sequencing. The interband surface plasmon resonance and field-enhancement properties graphene nanopore in presence nucleobases are investigated using hybrid quantum/classical method (HQCM), which employs time-dependent density functional theory quasistatic finite difference time domain approach. In strong plasmonic-molecular coupling regime where absorption frequencies degenerated, optical...
We propose an active plasmonic device based on graphene. By using a diffractive grating silicon, highly confined waves in monolayer graphene are efficiently excited. The high electric field of the surface plasmons near layer makes them ideal for use biosensors, where very small change refractive index should be detected. A surroundings medium, induces large resonant wavelength. spectral shift per unit (∆λ0/RIU) sensor is considerable and exceeding 2000 nm/RIU with narrow line width plasmon...
Plasmons in graphene present desirable electronic properties and unique opportunities to enhance light–matter interactions control light at nanoscale dimensions. The combination of with metal nanostructures is promising for optical science plasmonic manipulations. We propose a system based on resonant antenna detection counting nanoparticles. performance the proposed relies intrinsic particles, including refractive index, which can be used modulate transmitted power. Simulations show that,...
The Surface Plasmon Resonance (SPR) properties in the petahertz (1015 Hz) frequency range for monolayer graphene nanosheet and nanopore are investigated using discrete dipole approximation method. We calculate refractive indices by rst-principle density functional theory. near-fi eld enhancement made plasmon these structures is studied employing nite-di erence-time-domain For nanosheets, energy of SPR peak drops with increase sheet length. Also, nanopores smaller than 5 nm length, increasing...
ABC-metamaterial, structured by repeating atomic layer deposition of three dielectric material-stack layers, opens the new possibility for creating second-order nonlinearity in CMOS-compatible photonics platforms. Here, design and simulation Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> waveguide with embedded ABC-metamaterial generating second-harmonic (SH) 1.55 <inline-formula...
Real-time cell proliferation assays, incorporating fluorescent dyes into cells and bulky optical imaging systems, are the gold standard for cellular analysis at single-cell level. As components of a simplified miniaturized system, conventional field-effect transistor (FET)-based platform allows label-free detection biomolecules by measuring their inherent charge carriers. In this study, we developed winkled graphene-based FET (G-FET) to evaluate process with directional characteristics...
We propose a new DNA sequencing concept based on nonradiative Förster resonant energy transfer (FRET) from donor quantum dot (QD) to an acceptor molecule. The FRET mechanism combined with the nanopore-based translocation is suggested as novel for molecules. A recently-developed hybrid quantum/classical method employed, which uses time-dependent density functional theory and quasistatic finite difference time domain calculations. Due significant absorbance of bases photon energies higher than...