Article
Optics
Mohsen Samadi, Sara Darbari, Mohammad Kazem Moravvej-Farshi
Summary: This study introduces a hybrid gold-graphene plasmonic tweezers that efficiently manipulates micrometer particles by varying the trap stiffness of the graphene layer. The graphene layer absorbs the plasmonic field around gold nanostructures at specific chemical potentials, allowing modulation of plasmonic force components and trapping potential, leading to more efficient heat transfer.
Article
Optics
Saeed Hemayat, Sara Darbari
Summary: In this report, a graphene-based plasmonic lens is designed for far-field position-tunable trapping of dielectric particles at a wavelength of 1550 nm. By applying a variable gate voltage to the graphene ribbons, the target particles can be floated at a variable z-position, allowing for position-tunable 3D trapping. This proposed structure offers advantages over conventional plasmonic tweezers by reducing thermal issues and providing higher degrees of freedom for studying target characteristics. It is a new generation of long-range, electrostatically tunable 3D plasmonic tweezing without the need for bulky optomechanical equipment.
Article
Optics
Ali Asghar Khorami, Behdad Barahimi, Sare Vatani, Athar Sadat Javanmard
Summary: We utilize graphene nano-taper plasmons to create tunable plasmonic tweezers for the manipulation of neuroblastoma extracellular vesicles. By engineering the dimensions and Fermi energy of the nano-taper, we can generate the desired near-field gradient force for trapping under low-intensity illumination. The designed system can efficiently trap neuroblastoma extracellular vesicles with a diameter of 88 nm.
Article
Optics
J. I. D. U. O. Dong, L. I. N. L. O. N. G. Tang, B. I. N. B. I. N. Wei, X. I. A. N. G. X. I. N. G. Bai, Q. I. N. G. Zang, H. A. O. Zhang, C. H. U. N. H. E. N. G. Liu, H. A. O. F. E. Shi, Y. A. N. G. Liu, Y. U. E. G. U. A. N. G. Lu
Summary: This article proposes a new type of miniaturized infrared spectrometer based on tunable graphene plasmonic filters and infrared detectors. The transmittance spectrum of the graphene filter can be adjusted by changing its Fermi energy, allowing for dynamic modulation of incident light and encoding of spectral information. Factors such as graphene carrier mobility and signal-to-noise ratio are found to be key parameters influencing spectrometer performance. A hybrid decoding algorithm combining ridge regression and a neural network is proposed, achieving sub-hundred nanometer spectral resolution. The proposed microchip-sized spectrometer has the potential for integration in portable infrared spectral imaging devices.
Article
Optics
Jiduo Dong, Linlong Tang, Binbin Wei, Xiangxing Bai, Qing Zang, Hao Zhang, Chunheng Liu, Haofei Shi, Yang Liu, Yueguang Lu
Summary: A miniaturized infrared spectrometer based on tunable graphene plasmonic filters and infrared detectors is proposed. The transmittance spectrum of the filter can be adjusted by changing the Fermi energy of the graphene, allowing dynamic modulation of incident light and encoding its spectral information in the infrared detector. Decoding algorithms such as ridge regression and neural networks can reconstruct the incident spectrum. The spectrometer has the potential to be integrated into portable devices for infrared spectral imaging applications.
Article
Physics, Multidisciplinary
Huanxi Ma, Guangwu Pan, Hengjie Zhou, Zhen He, Liqiang Zhuo, Zhi Li, Fengjiang Zhuang, Shaojian Su, Zhili Lin, Weibin Qiu
Summary: This study investigates the axial plasmonic Talbot effect using a graphene monolayer sheet with varying chemical potential distributions. The Talbot distance is found to be inversely proportional to frequency, decreasing with higher graphene chemical potential. Furthermore, the full width at half maximum (FWHM) of Talbot image increases with both chemical potential and frequency, suggesting potential applications in deep sub-wavelength imaging and nano-lithography.
Article
Engineering, Electrical & Electronic
Chan-Shan Yang, Yi-Cheng Chung, Yi-Sheng Cheng, Young-Chou Hsu, Ciao-Fen Chen, Nan-Nong Huang, Hung-Cheng Chen, Chien-Hao Liu, Jin-Chen Hsu, Yen-Fu Lin, Tzy-Rong Lin
Summary: The research proposed a highly tunable hybrid plasmonic biosensor for identifying molecule fingerprints of proteins in the infrared range. The device has high effective sensitivity and wide-ranging electrical tunability, improving accuracy and convenience in detection.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Yunping Qi, Chuqin Liu, Bingbing Hu, Xiangyu Deng, Xiangxian Wang
Summary: A tunable selective absorber consisting of periodic arrow-shaped graphene arrays operating in the far infrared and terahertz range is proposed by depositing a set of arrow-shaped graphene ribbons on a SiO2 dielectric spacer. The research shows that increasing both the Fermi level and relaxation time significantly enhances the absorption performance, with a nearly 12-fold improvement when both parameters are increased simultaneously. Additionally, increasing the relaxation time from 0.1 ps to 1.0 ps results in an increase in the maximum absorption peak value.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Hongyan Yang, Ziyang Mei, Zhenkai Li, Houquan Liu, Hongchang Deng, Gongli Xiao, Jianqing Li, Yunhan Luo, Libo Yuan
Summary: In this study, we propose an integrated 2D plasmonic optical tweezer consisting of a graphene disc array and a substrate circuit. This optical tweezer can generate optical forces on nanoparticles at a low incident intensity and dynamically transport them by controlling the excitation position.
Article
Physics, Applied
Chenwei Wei, Tun Cao
Summary: The proposed tunable plasmonic biosensor based on alpha-MoO3/graphene hybrid architectures can achieve high phase detection sensitivity, offering a new direction in the development of tunable ultrasensitive plasmonic biosensors.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Juveriya Parmar, Shobhit K. Patel, Kawsar Ahmed, Vigneswaran Dhasarathan
Summary: A tunable multistacked metamaterial-based graphene grating structure has been proposed for the lower THz frequency range, with wideband reflectance response achieved by placing circular gold wire between graphene layers. Reflectance in the grating can be controlled by different chemical potentials of the graphene sheet. This grating structure has wideband tunable reflectance response and is envisioned to be applicable in various THz systems for circulator, sensor, and imaging applications.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Optics
Geraldo Melo, Wagner Castro, Cristiano Oliveira
Summary: We propose a simple and compact structure as a graphene-based plasmonic band stop filter for the THz region. By changing the chemical potential of graphene, the operating range of the filter can be dynamically controlled. Numerical simulations show that the device has good performance for the frequency range used in our work and can be used for future applications.
Article
Optics
Fahad Ahmed Alzahrani, Vishal Sorathiya
Summary: This paper proposes a tunable graphene-silica-assisted squared pixel array-shaped polarizer construction for the infrared frequency range. The behavior of the structure, including the transmittance coefficient and phase variation response, is studied over the 1-15 THz of infrared frequency. The proposed structure of the polarizer allows choosing the resonating conditions over 1-15 THz of the band using different pixel array geometries, transmittance and phase variation responses.
APPLIED PHYSICS B-LASERS AND OPTICS
(2023)
Article
Engineering, Electrical & Electronic
Victor Dmitriev, Geraldo Melo, Wagner Castro
Summary: A new multifunctional THz device has been proposed, capable of operating as a tunable switch and filter. The device consists of graphene nanostructures controlled by a dc magnetic field. Numerical simulations demonstrate effective transmission and filtering under specific conditions.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Materials Science, Multidisciplinary
Zhe Wang, Chunzhen Fan
Summary: The paper proposes a novel graphene-black phosphorus hybrid photonic device that exhibits enhanced performance compared to individual graphene or black phosphorus layers. By adjusting different parameters, the resonant absorption peaks of the device can be tuned independently, offering high flexibility and stability. This device shows great potential for applications in photodetectors, polarizers, and imaging systems.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Mahsa Nasehi, Meysam Saeedi, Jalaledin Ghanavi, Mohammad Kazem Moravvej-Farshi
Summary: We have successfully synthesized biologically compatible gold nanoparticles modified with linoleic acid, and conducted glucose sensing experiments using these nanoparticles. Our results show that the presence of linoleic acid degradation and auto-oxidation, as well as the catalytic properties of gold nanoparticles, enhance the sensitivity of glucose detection by 4.8 times compared to using linoleic acid alone.
IEEE SENSORS JOURNAL
(2022)
Article
Optics
Elnaz Pilehvar, Ehsan Amooghorban, Mohammad Kazem Moravvej-Farshi
Summary: In this study, we investigate the propagation of squeezed coherent state of light through a dispersive non-Hermitian multilayered structure with gain and loss media. We examine the effects of dispersion and gain/loss-induced noises on the nonclassical properties of the incident light, such as squeezing and sub-Poissonian statistics. Our results show that increasing the number of unit cells and incident angle degrade the quantum features of the transmitted state for both polarization.
Article
Chemistry, Physical
Majid Ghandchi, Ghafar Darvish, Mohammad Kazem Moravvej-Farshi
Summary: The electro-optical properties of photodetectors based on mono- and bilayer graphene quantum dots were investigated. These photodetectors showed superior performance to structures based on graphene nanoribbons and are suitable for use in optical integrated circuits.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Optics
Elnaz Pilehvar, Ehsan Amooghorban, Mohammad Kazem Moravvej-Farshi
Summary: By investigating the propagation of a squeezed coherent state of light through dispersive non-Hermitian optical bilayers, we reveal the insignificant effect of thermal effects on the propagation properties and demonstrate that the transmitted squeezed coherent states can retain their nonclassical characteristics to some extent, especially for frequencies far from the emission frequency of the gain layer.
Article
Optics
Sajjad Moshfe, Kambiz Abedi, Mohammad Kazem Moravvej-Farshi
Summary: In this study, a fully integrated all-optical 3-bit analog to digital converter (AO-ADC) was designed by integrating a photonic crystal based semiconductor optical amplifier (PhC-SOA) with channel drop filters (CDFs). The experimental results showed that the proposed structure achieved high conversion efficiency and stability, converting analog photonic signals into digital output with minimal size and power consumption.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Mohammad Mahdi Mehrnegar, Sara Darbari, Mohammad Kazem Moravvej Farshi
Summary: In this study, graphene-based acousto-plasmonic biosensors are used to propose two methods for eliminating measurement ambiguity. By adjusting the applied voltage and using dual-segment gratings, the measurement results can be interpreted without ambiguity. Furthermore, the study investigates the influence of measurement parameters and sensor control parameters on sensing characteristics.
Article
Physics, Applied
Reza Abbasi, Rahim Faez, Ashkan Horri, Mohammad Kazem Moravvej-Farshi
Summary: We present a computational study on the electrical behavior of field-effect transistors based on vertical graphene-hBN-chi(3) borophene heterostructure and vertical graphene nanoribbon-hBN-chi(3) borophene nanoribbon heterostructure. The study investigates the electrical characteristics of the device, such as ION/IOFF ratio, subthreshold swing, and intrinsic gate-delay time. It is shown that increasing the hBN layer number decreases the subthreshold swing and degrades the intrinsic gate-delay time. The device allows for current modulation of 177 with a gate-source bias voltage of 1.2V at room temperature.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Optics
Mohsen Samadi, Pooya Alibeigloo, Abolfazl Aqhili, Mohammad Ali Khosravi, Farahnaz Saeidi, Shoaib Vasini, Mostafa Ghorbanzadeh, Sara Darbari, Mohammad Kazem Moravvej-Farshi
Summary: Plasmonic tweezers are indispensable tools for manipulating micro and nano-objects with high precision, utilizing surface plasmon technology to trap particles beyond the diffraction limit. Trapping-potential landscape can be reconfigured by designing plasmonic nanostructures.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Sharare Jalalvandi, Sara Darbari, Mohammad Kazem Moravvej-Farshi
Summary: This study presents a model to consider the effects of optical phonons on surface plasmons in graphene and verifies its accuracy through calculating the extinction spectra. The model overcomes the limitations of earlier models and fits the experimental data well. It is important for accurately predicting the behavior of graphene-based plasmonic devices.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Reza Abbasi, Rahim Faez, Ashkan Horri, Mohammad Kazem Moravvej-Farshi
Summary: This paper presents a tight-binding model for the electronic properties of free-standing chi(3) and beta(12) borophenes, using the Slater-Koster approach. The model considers s, p(x), p(y), and p(z) orbitals for each boron atom and accurately describes the energy bands around high-symmetry k-points. The optimal Hamiltonian and overlap matrix are calculated by fitting the results of the model and density functional theory calculations.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Nourieh Fathollahbeigi, Fatemeh Ostovari, Mohammad Kazem Moravvej-Farshi
Summary: We conducted a numerical study on MoS2-based field-effect photodetectors (FEPhDs). These FEPhDs consist of MoS2 armchair (zigzag) nanoribbons (MoS2-A(Z)NRs) as channels connected to graphene electrodes. Our simulations showed that passivation of ANR edges with H-2 and OH molecules reduced the bandgap of MoS2 by approximately 28% and 28.6%, respectively. We found that the proposed MoS2-A(Z)NR-based FEPhDs have potential applications in nanoscale optoelectronic devices in the UV-Vis range.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Optics
Mehdi Dehghan, Mohammad Kazem Moravvej-Farshi, Masoud Jabbari, Ghafar Darvish, Mohsen Ghaffari-Miab
Summary: A plasmonic crystal structure based on graphene at terahertz frequency is proposed and simulated, which includes an ON/OFF and a directional switch. Implementing a crystalline structure in graphene enhances absorption by creating a bandgap. The extinction ratio of the switches can be designed to be higher than 30 dB. Other advantages include high quality factor and small dimensions.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
M. Daryani, A. Rostami, G. Darvish, M. k. morravej Farshi
Summary: It has been shown that quantum coherence induced by incoherent light can increase the efficiency of solar cells. This study evaluates the effect of such coherence in intermediate band solar cells (IBSC) and demonstrates that the quantum coherence can significantly increase the output power of the cell.
Proceedings Paper
Engineering, Electrical & Electronic
Elnaz Pilehvar, Ehsan Amooghorban, Mohammad Kazem Moravvej-Farshi
Summary: This paper investigates the dispersion and medium effects of non-Hermitian bilayer structures on the squeezing property of obliquely incident squeezed light. The results show that while the squeezing property is retained for incident frequencies farther from the emission frequency of the gain layer, the output light is not squeezed in the PT-symmetric phase.
2022 WORKSHOP ON RECENT ADVANCES IN PHOTONICS (WRAP)
(2022)
Article
Optics
Mohamad Ansari, Mohammad Kazem Moravvej-Farshi
Summary: We propose a dual-purpose sensor to detect ammonia and relative humidity, using a tapered multimode fiber as the sensor structure and silica gel as the sensing layer. Experimental results show that a decrease in the tapered waist increases the sensor sensitivity.