Article
Optics
Samira Mehrabi, Mir Hamid Rezaei, Mohammad Reza Rastegari
Summary: This paper presents the design and analysis of an ultra-broadband solar absorber based on two TiN metasurface resonators. Simulation results demonstrate the absorber's high absorption, continuous bandwidth, and insensitivity to incident angle.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Omid Abbaszadeh-Azar, Kambiz Abedi
Summary: This paper presents a design of an ITO-based hybrid plasmonic ring resonator modulator aimed at improving the extinction ratio and quality factor. By reducing the surface area between silicon and the ITO/HfO2 interface, the capacitance is effectively reduced. Two different structures of the modulator achieve high quality factor and low power consumption, low insertion loss, as well as high extinction ratio and quality factor. The modulator characteristics are investigated using the finite-difference time-domain (FDTD) method.
Article
Engineering, Electrical & Electronic
Hossein Karimkhani, Asma Attariabad, Hamid Vahed
Summary: In this paper, a plasmonic sensor based on silicon dioxide (SiO2) ring and disk resonator with high sensitivity was investigated. By tailoring the geometrical parameters and refractive index materials, the sensor achieved high optical absorption and sensitivity.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Manoj Mishra, Mohit Sharma, Prachi Gupta
Summary: A compact plasmonic metal-insulator-metal ring resonator is proposed in this article, which can function as an optical filter by adjusting structural parameters, showing different performance with various metal materials and channel designs. Three transmission peaks are observed for the first time in the near infrared regime, indicating a wide range of potential applications.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Santosh Kumar, Ashutosh Kumar, Rahul Dev Mishra, Prem Babu, Suresh Kumar Pandey, Manoj K. Pal, Mukesh Kumar
Summary: This article proposes a nanophotonic ring resonator based on a slotted hybrid plasmonic waveguide (HPW) for resonance-enhanced sensing. The slotted ring structure provides a propagation length of over 2.5 mm with subwavelength confinement at 1.55 μm wavelength, as well as broadband propagation of HP in the range of 1.3-1.6 μm. By changing the analyte refractive index, a 29.6-nm shift in the transmission spectra is observed, and the sensitivity for detecting polluted water is reported to be 1609 nm/RIU. The proposed slotted waveguide structure has potential applications in nanophotonic devices for biochemical sensing and large-scale photonic integration.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Santosh Kumar, Ashutosh Kumar, Rahul Dev Mishra, Prem Babu, Suresh Kumar Pandey, Manoj K. Pal, Mukesh Kumar
Summary: Proposed a nanophotonic ring resonator based on a slotted hybrid plasmonic waveguide, allowing for resonance-enhanced sensing and strong light-analyte interaction at the subwavelength scale. The structure exhibited a propagation length of over 2.5 mm and subwavelength confinement at a wavelength of 1.55 μm. By changing the refractive index of the analyte, a 29.6-nm shift in the transmission spectra was observed, with a reported sensitivity for detecting polluted water approximately four times higher than a dielectric slotted ring resonator and eight times higher than a ring resonator with a ridge structure. This slotted waveguide structure has potential applications in nanophotonic devices, including biochemical sensing and large-scale photonic integration.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Physical
Abdolkarim Afroozeh
Summary: In this paper, a high-quality filter design based on nanostructured plasmon resonators is proposed, which can achieve optimal results in the communication wavelength range. Evaluation and optimization are carried out using the coupled mode theory and finite-difference time-domain method. The structure not only exhibits filtering behavior, but also allows control of the surface plasmon propagation speed, expecting wide applications in telecommunication links.
Article
Physics, Condensed Matter
Kum-Song Ho, Hyon-Kyong Paek, Song-Jin Im, Jong-Wu Kim, Song-Chon Kim, Un-Song Kim, Kum-Dong Kim, Kil-Song Song
Summary: In this paper, a robust and high performance plasmonic refractive index (RI) sensor based on graphene plasmon waveguide coupled to graphene nano-ring resonator is presented. The characteristics of the RI sensor, including resonance wavelength, wavelength sensitivity, and figure of merit (FoM), are analytically derived. The study demonstrates the possibility of achieving a high FoM through the structural symmetry of the resonator and the tunable physical properties of graphene. Based on numerical solutions, the RI sensor exhibits robust and high performance, making it a promising candidate for practical nanoscale integrated sensors.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Computer Science, Information Systems
Kola Thirupathaiah, Montasir Qasymeh
Summary: In this study, an ultra-wideband optical bandpass filter based on nanoplasmonic structure is designed and analyzed. The filter utilizes a metal-insulator-metal slot waveguide and resonators to achieve excellent ultra-wideband characteristics. The characteristic parameters of the filter structure are thoroughly analyzed using CAD simulation software, and the design is optimized by increasing the number of coupled resonators.
Article
Engineering, Electrical & Electronic
Iman Davoudi, Rahim Ghayour, Ramin Barati
Summary: In this paper, a plasmonic filter based on a suspended graphene sheet using a ring resonator in the terahertz frequency range is proposed and designed. The structure is simulated and analyzed using the effective index method in a two-dimensional model. The transmission coefficient and tunability behavior of the structure are evaluated via finite element method. It is found that the structure's characteristics can be adjusted through controlling the resonant frequencies and tuning the resonant wavelengths. Additionally, the terahertz wave transmission ratio can be adjusted by changing the chemical potential of the suspended graphene sheet.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Optics
Min G. Lim, Young J. Park, Dong J. Choi, Dong U. Kim, Myung S. Hong, Man J. Her, Alain Y. Takabayashi, Youngjae Jeong, Jongwoo Park, Seungjun Han, Niels Quack, Youngseok Bae, Kyoungsik Yu, Sangyoon Han
Summary: In this research, a fully integrated second-order CROW filter using silicon photonic MEMS with adjustable couplers and phase shifters was developed. The filter demonstrated high extinction ratios and continuous wavelength tuning, and showed reconfigurability in second-order CROW.
Article
Optics
Jin Yao, Jun-Yu Ou, Vassili Savinov, Mu Ku Chen, Hsin Yu Kuo, Nikolay Zheludev, Din Ping Tsai
Summary: This work experimentally demonstrates the high sensitivity of a plasmonic anapole metamaterial sensor to the refractive index of the environment in the optical part of the spectrum. The results show promising potential for applications in biosensing and spectroscopy.
Article
Engineering, Electrical & Electronic
Sherin Thomas, Mandeep Singh, M. N. Satyanarayan
Summary: A high sensitivity refractive index SIS waveguide with a ring resonator sensor at THz frequency is proposed in this study. The topological structure of the proposed filter is numerically simulated using the finite element method. By filling the air-filled ring resonator cavity with different refractive index materials, a maximum sensitivity of 0.509 THz/RIU is achieved. The transmission characteristics are studied by varying the structural dimensions, and it is observed that the system can be treated as a frequency selective device.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Physical
Samaneh Hamedi, Roozbeh Negahdari, Hamid Reza Ansari
Summary: A new all-optical 4 x 2 encoder utilizing plasmonic effect has been designed in this paper, showing high transmission efficiency and versatility in achieving different logic states. The compact structure allows for easy integration into compact all-optical processing systems.
Article
Optics
Glen A. Sanders, Austin A. Taranta, Chellappan Narayanan, Eric Numkam Fokoua, Seyedmohammad Abokhamis Mousavi, Lee K. Strandjord, Marc Smiciklas, Thomas D. Bradley, John Hayes, Gregory T. Jasion, Tiequn Qiu, Wes Williams, Francesco Poletti, David N. Payne
Summary: The research successfully improved the stability of the hollow-core fiber optic gyroscope using high-performance fiber technology, nearing the level required for civil aircraft navigation.
Article
Physics, Multidisciplinary
Nahid Talebi, Iva Brezinova
Summary: The quantum world is characterized by probability amplitudes and effects such as entanglement, which can be used to speed up computational algorithms and secure cryptography. In a thought experiment, quantum correlations between particles are explored in matter wave microscopy, with findings indicating the transfer of information and the role of decoherence mechanisms in open quantum systems.
NEW JOURNAL OF PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Fatemeh Davoodi, Nahid Talebi
Summary: Van der Waals materials such as TMDCs exhibit strongly bound exciton states in the visible spectrum, providing an ideal platform for exciton-photon couplings. Utilizing nanometer-thick semiconducting TMDCs combined with metals can significantly increase light-matter interaction. In gold-WSe2 multilayers, both exciton A and exciton B can strongly interact with surface-plasmon polaritons, leading to CL emission suppression and revealing energy transfer between excitons and plasmons in the form of nonradiating guided waves.
ACS APPLIED NANO MATERIALS
(2021)
Article
Physics, Applied
Fatemeh Chahshouri, Masoud Taleb, Florian K. Diekmann, Kai Rossnagel, Nahid Talebi
Summary: This study reports on the effect of electron-beam deceleration on Cherenkov radiation in nm-thick WSe2 crystals and investigates the interaction between excitons and generated photons beyond the non-recoil approximation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
News Item
Physics, Multidisciplinary
Nahid Talebi
Summary: Solid-state sources of entangled photons with tailored properties are essential for integrated quantum computing. Utilizing refractive-index perturbations propagating faster than the speed of light may provide a practical approach for generating entangled photon pairs.
Article
Nanoscience & Nanotechnology
Fatemeh Davoodi, Masoud Taleb, Florian K. Diekmann, Toon Coenen, Kai Rossnagel, Nahid Talebi
Summary: Transition-metal dichalcogenides combined with metals can enhance and tailor light-matter interactions, forming hybrid structures. The coupling between plasmons in plasmonic crystals and excitons in WSe2 results in flat bands, with optical waves exhibiting remarkably low group velocities. These findings have implications for the design of tunable slow-light structures and plexcitonic topological photonic structures.
Article
Optics
Steffen Boerm, Fatemeh Davoodi, Ralf Koehl, Nahid Talebi
Summary: By breaking the symmetry of photonic crystals, researchers have discovered the formation of complete inverted bandgaps, which can be attributed to the level repulsion between degenerate modes.
Article
Physics, Multidisciplinary
Fatemeh Chahshouri, Nahid Talebi
Summary: The inelastic interaction between free-electrons and optical near fields has been studied for the manipulation and shaping of free-electron wavepackets. The dependence of the inelastic cross section on the polarization of the optical near-field is important for both fundamental aspects and new applications in quantum-sensitive measurements. Our study investigates the effect of polarization and spatial profile of plasmonic near-field distributions on shaping free-electrons and controlling energy transfer mechanisms, as well as tailoring electron recoil. We demonstrate the use of polarization of the exciting light as a control knob for disseminating the acceleration and deceleration pathways via electron recoil, and the possibility of tailoring localized plasmon shapes by incorporating specific arrangements of nanorods to enhance or hamper recoils of free-electrons.
NEW JOURNAL OF PHYSICS
(2023)
Article
Multidisciplinary Sciences
Amir Mohammad Ghanei, Abolfazl Aghili, Sara Darbari, Nahid Talebi
Summary: Here, we demonstrate that linearly polarized light can generate plasmonic vortex (PV) by coupling to surface plasmon polaritons at an elliptical hole perforated in a gold layer. The smooth variation of the minor to major ellipse axes enables a gradual variation in the phase profile of the PV. Three types of independent arrays of elliptical holes are presented, which can produce uniform and high quality PVs with different topological charges at the center of the arrays.
SCIENTIFIC REPORTS
(2023)
Article
Physics, Applied
Elham Balaei, Mahmoud Shahabadi, Nahid Talebi
Summary: Optical modes in channel waveguides composed of lossy bianisotropic magnetoelectric (ME) materials have been theoretically investigated using a generalized semi-analytical method based on the Fourier expansion technique. The dispersion diagram and field profile of the guided modes are obtained, showcasing the impact of ME materials on polarization. Numerical results are compared with commercial electromagnetic solvers to validate the computational efficiency and accuracy of the proposed method.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
News Item
Optics
Nahid Talebi
Summary: X-ray photons emitted by free electrons in van der Waals materials exhibit energy shifts due to quantum recoil, providing a viable approach for generating tailored and tunable single X-ray photons.
Article
Physics, Multidisciplinary
Masoud Taleb, Mario Hentschel, Kai Rossnagel, Harald Giessen, Nahid Talebi
Summary: Ultrafast photon-electron spectroscopy in electron microscopes commonly requires ultrafast laser setups. Now, an inverse approach based on cathodoluminescence spectroscopy has allowed a compact solution to spectral interferometry inside an electron microscope, without a laser.
Article
Physics, Multidisciplinary
Sven Ebel, Nahid Talebi
Summary: In this study, the authors demonstrate the inelastic interactions between electrons and light in free space through the presence of ponderomotive potentials generated by light. By using a single structured traveling light beam, the authors modulate the final electron energy spectrum, resulting in discrete energy sidebands. In the presence of light pulses and standing light waves, electrons undergo inelastic scattering in free space, and multiple light beams can lead to the formation of discrete energy sidebands.
COMMUNICATIONS PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Masoud Taleb, Mohsen Samadi, Fatemeh Davoodi, Maximilian Black, Janek Buhl, Hannes Lueder, Martina Gerken, Nahid Talebi
Summary: The study of spin-orbit coupling (SOC) of light is crucial to explore the light-matter interactions in sub-wavelength structures. By designing a plasmonic lattice with chiral configuration that provides parallel angular momentum and spin components, one can trigger the strength of the SOC phenomena in photonic or plasmonic crystals. Our study gives insight into the design of novel plasmonic devices with polarization-dependent directionality of the Bloch plasmons. We expect spin-orbit interactions in plasmonics will find much more scientific interests and potential applications with the continuous development of nanofabrication methodologies and uncovering new aspects of spin-orbit interactions.
Article
Nanoscience & Nanotechnology
Fatemeh Davoodi, Nahid Talebi
Summary: Topological plasmonics combines concepts from topology and plasmonics to achieve scattering-free propagation of plasmons. This study focuses on the design, characterization, and manipulation of topological plasmonic chains of nanodiscs. It explores the unique properties of these resonators and their potential to support topologically protected edge modes.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Masoud Taleb, Fatemeh Davoodi, Florian K. Diekmann, Kai Rossnagel, Nahid Talebi
Summary: This study determines the optical response of WSe2 flakes using cathodoluminescence spectroscopy and reveals strong exciton-photon interaction effects and energy transfer dynamics. Furthermore, confinement effects due to discontinuities in the flakes are demonstrated and used to tailor mode energies, spin-momentum couplings, and exciton-photon coupling strength, as well as to promote photon-mediated exciton-exciton interactions.
ADVANCED PHOTONICS RESEARCH
(2022)
