Article
Optics
Hironobu Yoshimi, Takuto Yamaguchi, Ryota Katsumi, Yasutomo Ota, Yasuhiko Arakawa, Satoshi Iwamoto
Summary: Experimental demonstration of topological slow light waveguides in valley photonic crystals, showing more efficient waveguiding in the topological mode compared to the non-topological mode.
Article
Chemistry, Physical
Rajeshkumar Mupparapu, Joao Cunha, Francesco Tantussi, Andrea Jacassi, Leopold Summerer, Maddalena Patrini, Andrea Giugni, Lorenzo Maserati, Alessandro Alabastri, Denis Garoli, Remo Proietti Zaccaria
Summary: Efforts have been made to develop efficient high-frequency rectifying antennas for light harvesting and photodetection applications, but there have been challenges in understanding the underlying physics and limitations in fabrication techniques. This study demonstrates a new type of rectifying antenna based on plasmonic carrier generation, which shows improved current generation and high efficiency at 280 THz (1064 nm).
ADVANCED ENERGY MATERIALS
(2022)
Article
Multidisciplinary Sciences
Matthew Klein, Rolf Binder, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, John R. Schaibley
Summary: This study demonstrates a 1300-fold reduction of the SPP group velocity using coupled exciton-surface plasmon polaritons in a monolayer WSe2 structure. The findings provide a new approach for on-chip actively switched delay lines and optical buffers, which are important for telecommunications and quantum photonics applications.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Zhihui He, Lingqiao Li, Wei Cui, Yixuan Wang, Weiwei Xue, Hui Xu, Zao Yi, Chunjiang Li, Zhenxiong Li
Summary: The study investigates unidirectional reflectionless light propagation in a waveguide coupled to gain and loss resonators. Results show total reflection and coherent perfect absorption can be achieved under specific conditions. The proposed metal-insulator-metal non-parity-time symmetric plasmonic waveguide demonstrates unidirectional plasmonic propagation and CPA, with theoretical results aligning with finite-difference time-domain simulations.
NEW JOURNAL OF PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Lokendra Singh, Agostino Iadicicco, Niteshkumar Agrawal, Chinmoy Saha, Reshu Chauhan
Summary: This work utilizes metal-insulator-metal plasmonic waveguides and cascaded Mach-Zehnder modulators to design a signal router with a footprint of 58 μm. By optimizing parameters such as mesh size and linewidth, efficient signal transmission at an operating wavelength of 1550 nm is achieved.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Optics
Luis Torrijos-Moran, Amadeu Griol, Jaime Garcia-Ruperez
Summary: Researchers have demonstrated slow light bimodal interferometric behavior in an integrated single-channel one-dimensional photonic crystal for the first time. This structure supports two electromagnetic modes with a large group velocity difference, resulting in over a 20-fold reduction in higher-order mode group velocity compared to other conventional interferometers. The proposed bimodal photonic crystal interferometer shows significant performance improvement in creating an ultra-compact optical modulator and a highly sensitive photonic sensor.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Optics
Lokendra Singh, Guo Zhu, G. Mohan Kumar, D. Revathi, Prakash Pareek
Summary: All-optical integrated circuits have been modeled to validate various logic gates and circuits, with the switching of signals achieved using a nonlinear Kerr material. The performance of the circuits was analyzed using a finite difference time domain (FDTD) based method, demonstrating a gradual decrease in extinction ratio with an increase in power difference.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Chuhua Wu, Zicong Guo, Shuxian Chen, Jun Yang, Kunhua Wen
Summary: In this study, a coupled plasmonic resonant system using a metal-insulator-metal (MIM) waveguide is proposed to generate multiple Fano resonances. By employing the multi-mode interference coupled-mode theory (MICMT), the system is analyzed theoretically and numerically validated with the finite-difference time-domain (FDTD) method. The designed structures show great potential for high integrated optical circuits of chip-scale optical sensors, slow light devices, or splitters, with the ability to manipulate Fano peaks through adjusting the parameters of the defective ring cavity.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Samyuktha K. Reddy, Mandeep Singh
Summary: This study demonstrates the use of a MISIM waveguide structure for ethanol sensing, showing that in the presence of harmful ethanol, the electric field in a low refractive index slot undergoes a red-shift in wavelength. By adjusting the silicon porosity and physical dimensions, the red-shift can be controlled. The optimized sensor metrics obtained through simulations and the fabrication stages are described. The sensor is found to be feasible for ethanol detection in hazardous environments.
IEEE SENSORS JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Li Niu, Quan Xu, Xueqian Zhang, Ziying Zhang, Shaoxian Li, Xieyu Chen, Yuehong Xu, Jiajun Ma, Ming Kang, Jiaguang Han, Weili Zhang
Summary: Efficient manipulation of electromagnetic waves using metasurfaces has been a focus of research, with the introduction of meta-coupling effects providing further physical insights in wave control. This strategy allows for efficient tuning of reflection phase shift without changing resonator dimensions, enabling the design of high-efficiency metasurface deflectors. The proposed controlling strategy enriches design freedoms and may have broad applications in functional devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
Shengjie Wu, Wange Song, Jiacheng Sun, Zhiyuan Lin, Haoran Xin, Shining Zhu, Tao Li
Summary: Broadband asymmetric light transport is achieved in non-Hermitian coupled waveguide triplet on the lithium niobate-on-insulator (LNOI) platform. A particular mode selection and shortcut to adiabaticity are used to enhance transmission efficiency and reduce device length. This work opens up new possibilities for on-chip light manipulations in the LNOI photonic platform.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Chirag Murendranath Patil, Guillermo Arregui, Morten Mechlenborg, Xiaoyan Zhou, Hadiseh Alaeian, Pedro David Garcia, Soren Stobbe
Summary: We report optical transmission measurements on suspended silicon photonic-crystal waveguides with a glide symmetry and slow light. The chiral light-matter interaction is strongly enhanced by this combination, but the interplay between slow light and backscattering has not been experimentally investigated in such waveguides. Photonic-crystal resonators consisting of glide-symmetric waveguides terminated by reflectors were built, and transmission measurements and evanescent coupling were used to map out the dispersion relation. The results show excellent agreement with theory and reveal the potential of these waveguides for applications in slow-light devices and chiral quantum optics.
Article
Engineering, Electrical & Electronic
Luis Torrijos-Moran, Antoine Brimont, Amadeu Griol, Pablo Sanchis, Jaime Garcia-Ruperez
Summary: A highly compact optical switch based on slow-light-enhanced bimodal interferometry in one-dimensional silicon photonic crystals is proposed and demonstrated, showing high efficiency operation with low power consumption. The device engineering highly dispersive and broadband bimodal regions for high-performance operation by exploiting the different symmetry of the modes.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Applied
Amirreza Mahigir, Georgios Veronis
Summary: This study introduces wavelength-scale light coupling structures and switches for plasmonic coaxial waveguides. By optimizing single-slit, double-slit, and triple-slit structures, the coupling efficiency is enhanced, and different propagation modes can be generated. Additionally, the study explores outcoupling structures for light extraction and utilizing proper angle excitation for specific modes in plasmonic coaxial waveguides.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Optics
Pilar Pujol-Closa, Jordi Gomis-Bresco, Samyobrata Mukherjee, J. Sebastian Gomez-Diaz, Lluis Torner, David Artigas
Summary: In symmetric planar structures with type II films, slow light in hyperbolic waveguides is associated with topological transitions in the dispersion diagram as film thickness changes, mediated by the coalescence of elliptical mode branches and anomalously ordered hyperbolic mode branches. This transition leads to the formation of a saddle point that transforms into a branch point with slow light characteristics and the appearance of ghost waves for a broad range of film thicknesses.
Article
Optics
Leonidas Dogkas, Thomas Kamalakis, Dimitris Alexandropoulos
Article
Engineering, Electrical & Electronic
Thomas Kamalakis
OPTICAL AND QUANTUM ELECTRONICS
(2018)
Article
Optics
Thomas Kamalakis, Georgia Dede
OPTICS COMMUNICATIONS
(2018)
Article
Engineering, Electrical & Electronic
G. Mourkioti, P. D. Georgiou, T. Kamalakis, D. Alexandropoulos
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2019)
Article
Computer Science, Software Engineering
Evangelia Filiopoulou, Georgia Dede, Christos Michalakelis, Thomas Kamalakis
IEEE INTERNET COMPUTING
(2019)
Article
Optics
Leonidas Dogkas, Thomas Kamalakis, Dimitris Alexandropoulos
OPTICS COMMUNICATIONS
(2019)
Article
Statistics & Probability
Thomas Kamalakis, Malvina Vamvakari
Summary: This work investigates the transient and recurrent conditions of nearest neighbour q-random walks on integer spaces of dimensions 1, 2, and 3. It also introduces relative continuous time q-random walks and q-Brownian motion on integers, studying their properties through simulations.
METHODOLOGY AND COMPUTING IN APPLIED PROBABILITY
(2021)
Article
Computer Science, Information Systems
Georgia Dede, Persefoni Mitropoulou, Mara Nikolaidou, Thomas Kamalakis, Christos Michalakelis
Summary: This paper focuses on exploring the dependencies between human safety requirements and other critical requirements in smart factory operation, using a model-driven approach based on SysML to quantify the importance of these dependencies. By prioritizing requirements with highly ranked dependencies, the proposed method aims to facilitate the implementation phase and production line, contributing to the development of a model-driven approach supporting the integration of systems and software modeling for robotic systems in smart factories incorporating HRC.
REQUIREMENTS ENGINEERING
(2021)
Article
Operations Research & Management Science
Georgia Dede, Thomas Kamalakis, Dimosthenis Anagnostopoulos
Summary: This paper introduces a new framework for incorporating confidence levels in pairwise comparisons to address uncertainty issues related to individual expert judgments. The theoretical model based on the multivariate normal cumulative distribution function is compared with numerical results (Monte Carlo simulations) showing good agreement. The proposed framework may provide a basis for extensions aiming to provide further information on the accuracy of the evaluation of the final outcome.
CENTRAL EUROPEAN JOURNAL OF OPERATIONS RESEARCH
(2022)
Article
Optics
Thomas Kamalakis, Leonidas Dogkas, Flora Simou
Summary: In this paper, the authors demonstrate the design of a VLC system using multiple sub-carrier modulation with a mixed-integer genetic algorithm, proposing a suitable figure-of-merit as a fitness function. The fitness function estimation is based on a rigorous system model that considers both linear and non-linear aspects of the transceiver. The algorithm can identify appropriate values for system parameters such as power allocation, modulation order, sub-carrier spacing, and clipping level.
OPTICS COMMUNICATIONS
(2021)
Article
Computer Science, Hardware & Architecture
Thomas Kamalakis, Zabih Ghassemlooy, Stanislav Zvanovec, Luis Nero Alves
Summary: This study analyzes the performance of a hybrid visible-light/infrared optical wireless communications network for indoor Internet-of-Things applications. It proposes an approach that connects multiple battery-powered sensor nodes using low-cost infrared light emitting diodes to transmit data, with a master node located on the ceiling of a room. The results demonstrate the suitability of this approach for sporadic transmission of low data rate signals and sensor readings in line with the requirements of massive machine-type communication fifth generation applications.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2022)
Article
Computer Science, Interdisciplinary Applications
Vasiliki Liagkou, George Fragiadakis, Evangelia Filiopoulou, Christos Michalakelis, Thomas Kamalakis, Mara Nikolaidou
Summary: Container-as-a-service (CaaS) is a business model that helps software developers organize, run, manage, and deploy applications. This research proposes a methodology to analyze the pricing strategies of providers and develops a hedonic price index. The model implementation and data set are available as open source.
SIMULATION MODELLING PRACTICE AND THEORY
(2022)
Article
Optics
Thomas Kamalakis, Zabih Ghassemlooy, Stanislav Zvanovec, Luis Nero Alves, Mohammad Khalighi
Summary: This paper investigates the optimization and design of an optical wireless sensor network (WSN) consisting of multiple battery-powered sensor nodes using light-emitting diode transmitters. By considering both line-of-sight and diffuse-light propagation, the results indicate that diffuse radiation can improve link availability and extend battery life in indoor scenarios. A machine-learning approach based on a genetic algorithm is used to optimize the optical wireless link parameters.
Article
Optics
Dimitrios Alexopoulos, Thomas Kamalakis
Summary: In this work, subpixel smoothing is introduced to improve the convergence properties of a finite difference frequency domain (FDFD) mode solver. The results show that tensor smoothing significantly improves the convergence of the solver and allows the use of less dense grids in calculations.
Article
Economics
Aggelos Skoufis, Georgios Chatzithanasis, Georgia Dede, Thomas Kamalakis, Christos Michalakelis
Summary: This article discusses the European Commission's specific goals for member states regarding the development of new generation networks, and presents a technoeconomic framework for the analysis of VDSL2 vectoring technology in a particular suburb of Athens, Greece. It emphasizes the importance of technoeconomic analysis in the initial development stages of telecom networks, providing insights into the financial viability and potential profits of investments in vectoring services.
