Article
Multidisciplinary Sciences
Myunghwan Kim, Seong-Han Kim, Chul Kang, Soeun Kim, Chul-Sik Kee
Summary: Graphene-based optical modulators have been widely studied, but weak graphene-light interactions limit the achievement of high modulation depth with low energy consumption. In this study, a high-performance graphene-based optical modulator, consisting of a photonic crystal structure and a waveguide, is proposed. It exhibits an electromagnetically-induced-transparency-like transmission spectrum at terahertz frequency, enhancing light-graphene interaction. The designed modulator achieves a high modulation depth of 98% with a small Fermi level shift of 0.05 eV, making it suitable for low power consumption in active optical devices.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Multidisciplinary
Liam Collard, Filippo Pisano, Di Zheng, Antonio Balena, Muhammad Fayyaz Kashif, Marco Pisanello, Antonella D'Orazio, Liset M. de la Prida, Cristian Ciraci, Marco Grande, Massimo De Vittorio, Ferruccio Pisanello
Summary: This paper discusses the integration of plasmonic structures on optical fibers and its potential applications. The turbidity of light propagation in multimode fibers hinders dynamic control of the coupling between guided light fields and plasmonic resonances. Utilizing the information of guided modes, the authors demonstrate the spatiotemporal control of plasmonic resonances by employing dynamic phase modulation.
Article
Chemistry, Multidisciplinary
Theng-Loo Lim, Yaswant Vaddi, M. Saad Bin-Alam, Lin Cheng, Rasoul Alaee, Jeremy Upham, Mikko J. Huttunen, Ksenia Dolgaleva, Orad Reshef, Robert W. Boyd
Summary: This study introduces the concept of Fourier lattice resonances (FLRs) and achieves complete control over the transmission spectrum of a metasurface by flexibly placing resonances. Based on standard lithographic fabrication methods, metasurfaces suitable for various optical cavity applications can be designed and manufactured.
Article
Chemistry, Multidisciplinary
Line Jelver, Joel D. Cox
Summary: Phosphorene, an atomically thin material, has garnered significant attention in the fields of optoelectronics and nanophotonics due to its exceptional optical properties and the ability to actively control light-matter interactions through electrical doping. Researchers have discovered that localized plasmons supported by phosphorene nanoribbons exhibit high tunability in relation to edge termination and doping charge polarity, leading to intense nonlinear optical responses at moderate doping levels. The tunability of plasmons in doped phosphorene nanoribbons at near-infrared frequencies can facilitate efficient high-harmonic generation by combining the electronic band structure and plasmonic field confinement.
Article
Chemistry, Multidisciplinary
Lakshmi Raju, Kyu-Tae Lee, Zhaocheng Liu, Dayu Zhu, Muliang Zhu, Ekaterina Poutrina, Augustine Urbas, Wenshan Cai
Summary: This research demonstrates the use of a deep learning framework to create an optimal design for a nonlinear metamaterial, maximizing its nonlinear effect. A nanolaminate metamaterial is used for validation, showing the effectiveness of the deep learning algorithm.
Article
Chemistry, Multidisciplinary
Emilija Petronijevic, Ramin Ghahri, Concita Sibilia
Summary: This study introduces a method of coupling emitting layers with plasmonic elliptical nanohole arrays to achieve circularly dependent near-infrared and visible emission, showcasing the chiral absorption and emission properties of the design.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Gregory Beti Tanyi, Miao Sun, Christina Lim, Ranjith Rajasekharan Unnithan
Summary: The plasmonic modulator designed in this study utilizes hybrid orthogonal silver junctions and vanadium dioxide as the modulating material on a silicon-on-insulator platform. It achieves a high modulation depth of 46.89 dB/mu m with a compact footprint of 1.8 mu m x 1 mu m. The simulated device shows potential for applications in next generation high frequency photonic modulators for optical communications.
Article
Chemistry, Multidisciplinary
Peng Mao, Changxu Liu, Yubiao Niu, Yuyuan Qin, Fengqi Song, Min Han, Richard E. Palmer, Stefan A. Maier, Shuang Zhang
Summary: Materials exhibit diverse responses to incident light based on their unique dielectric functions, with the optical response in nanotechnology being influenced by both material properties and geometric structures. The advancement of nanotechnology has led to significant progress in optical structures with feature sizes smaller than the optical wavelength, resulting in flourishing developments in plasmonics and photonic crystals. A counterintuitive system consisting of plasmonic nanostructures composed of different materials but exhibiting almost identical reflection has been proposed, highlighting the insensitivity of the optical response to different plasmonic materials.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Neuton Li, Jasper Cadusch, Amelia Liu, Anders J. Barlow, Ann Roberts, Kenneth B. Crozier
Summary: A computational algorithm is used to design plasmonic apertures for nanoparticle trapping, resulting in trapping forces significantly greater than traditional double nanohole designs. The designs are realized through experimental fabrication and studied using optical methods.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Peiyu Chen, Weikai Huang, Qiuxiao Feng, Yuwei Liu, Yu-Sheng Lin
Summary: This article presents a metamaterial grating waveguide (MGW) that can be used as a tunable optical attenuator and modulator in the infrared wavelength range. The MGW is composed of gold nanograting structures on a silicon nanograting waveguide and demonstrates the capability of attenuating and modulating light. Additionally, the MGW exhibits resonant properties that can be tuned by adjusting the incident angle and the refractive index of the environment.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Shihao Sun, Mingbo He, Mengyue Xu, Xian Zhang, Ziliang Ruan, Lidan Zhou, Lin Liu, Liu Liu, Siyuan Yu, Xinlun Cai
Summary: The hybrid Silicon and Lithium Niobate photonic integration platform combines the scalability of silicon photonics with the high modulation performance of Lithium Niobate, demonstrating high electro-optical bandwidth, low modulation voltage, and low optical insertion loss. It enables modulation rates up to 100 Gbit/s with excellent performance, providing a promising platform for future high-performance complex optical modulators.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Mohammed Alaloul, Jacob B. Khurgin
Summary: This article presents a practical design of an all-optical modulator based on graphene and hexagonal boron nitride (hBN) heterostructures. The interaction between graphene and guided light is enhanced by nanophotonic means, achieving high extinction ratio, low insertion loss, and energy-efficient switching. The device exhibits ultrafast switching with short recovery time and has the potential to be a high-performance all-optical modulator with ultra-high bandwidth. It is expected to meet the needs of next-generation photonic computing systems.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Elham Babaei, Demelza Wright, Reuven Gordon
Summary: By combining fringe-field dielectrophoresis with nano aperture optical tweezers, single molecule analysis of proteins in an aqueous environment without modification is achieved. The trapping time for proteins is significantly faster when the counter electrode is positioned outside of the solution compared to the more common configuration inside the solution. These findings are a major advancement for the nanoaperture optical trapping technique for high-throughput protein analysis.
Review
Chemistry, Multidisciplinary
Sihai Luo, Bard H. Hoff, Stefan A. Maier, John C. de Mello
Summary: This study evaluates some of the most promising techniques for nanogap fabrication, including traditional methods like photolithography, electron-beam lithography, and focused ion beam milling, as well as newer methods using novel electrochemical and mechanical means for patterning. The physical principles behind each method are reviewed, and their strengths and limitations for nanogap patterning are discussed in terms of resolution, fidelity, speed, ease of implementation, versatility, and scalability to large substrate sizes.
Article
Chemistry, Multidisciplinary
Andrew S. Kim, Mohammad Taghinejad, Anjan Goswami, Lakshmi Raju, Kyu-Tae Lee, Wenshan Cai
Summary: This study investigates the dependence of switching dynamics on optical resonances in plasmonic platforms. All-optical control of resonance bands in a hybrid photonic-plasmonic crystal is utilized to probe the resonance-dependent switching dynamics upon hot carrier formation. Experimental results demonstrate enhanced switching performance near the anti-crossing point, arising from strong coupling between local and nonlocal resonance modes. Additionally, the nonlinear correspondence between optical resonances and refractive index change, combined with hot-carrier dynamics, leads to tailorable dispersion of recovery speeds, deviating from the characteristic lifetime of hot carriers. The comprehensive understanding obtained in this study provides new protocols for optically characterizing hot-carrier dynamics and optimizing resonance-based all-optical switches.
Article
Chemistry, Multidisciplinary
Huajun Xu, Delwin L. Elder, Lewis E. Johnson, Wolfgang Heni, Yovan de Coene, Eva De Leo, Marcel Destraz, Norbert Meier, Wouter Vander Ghinst, Scott R. Hammond, Koen Clays, Juerg Leuthold, Larry R. Dalton, Bruce H. Robinson
Summary: This study demonstrates the enhancement of in-device electro-optic activity by utilizing theory-inspired organic electro-optic chromophores, showing significant improvement in optical properties and electro-optic coefficients compared to current state-of-the-art chromophores. The results suggest potential for practical applications in advanced electro-optic devices.
MATERIALS HORIZONS
(2022)
Article
Engineering, Electrical & Electronic
Bertold Ian Bitachon, Marco Eppenberger, Benedikt Baeuerle, Juerg Leuthold
Summary: A method for reducing the training time of DL-DBP is proposed by dividing the link into smaller sections. The experiment shows that the proposed method provides a gain in compensation performance compared to linear schemes, at the cost of increased training time.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Jasmin Smajic, Arif Can Gungor, Hande Ibili, Michal Maciejewski, Juerg Leuthold
Summary: This article addresses the difficulty of result verification in strongly coupled electromagnetic-mechanical problems and provides reference examples with analytical solutions. The obtained solutions were validated with an in-house developed solver, showing excellent agreement.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Engineering, Electrical & Electronic
Arif Can Gungor, Michael Doderer, Hande Ibili, Jasmin Smajic, Juerg Leuthold
Summary: This study models and simulates the generation of terahertz electrical signals from a photoactive semiconductor device illuminated by an optical pulse. By numerically solving the hydrodynamic equations in time domain, the authors obtained the frequency spectra of photocurrent in various semiconductor materials. The results show that the inertia effects and ballistic transport of carriers play an important role in determining the frequency response of these materials. The developed hydrodynamic model also predicts higher and wideband frequency capabilities for GaAs and Ge detectors compared to Si-photodetectors.
IEEE TRANSACTIONS ON MAGNETICS
(2022)
Article
Nanoscience & Nanotechnology
Raphael Schwanninger, Stefan M. Koepfli, Olesya Yarema, Alexander Dorodnyy, Maksym Yarema, Annina Moser, Shadi Nashashibi, Yuriy Fedoryshyn, Vanessa Wood, Juerg Leuthold
Summary: We demonstrate compact and efficient photodetectors operating at room temperature in a wavelength range of 2710-4250 nm with high responsivities of 375 and 4 A/W. The key to their high performance is the combination of a sintered colloidal quantum dot (CQD) heterojunction photoconductor and a metallic metasurface perfect absorber. The combination results in a 20-fold increase in responsivity compared to reference photoconductors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Jan Aeschlimann, Fabian Ducry, Christoph Weilenmann, Juerg Leuthold, Alexandros Emboras, Mathieu Luisier
Summary: We present a multiscale simulation framework for metal-oxide-metal structures in conductive bridging random-access memory (CBRAM). The framework utilizes a finite-element model with input parameters extracted from ab initio or machine-learned empirical calculations. The model includes techniques such as molecular dynamics, nudged elastic band, electronic transport, and thermal quantum transport. Experimental data of an Ag/a-SiO2/Pt CBRAM is well reproduced using this framework. Joule heating is found to be significant in devices with thin conductive filaments and current concentrations in the tens-microampere range.
PHYSICAL REVIEW APPLIED
(2023)
Article
Nanoscience & Nanotechnology
Miklos Csontos, Yannik Horst, Nadia Jimenez Olalla, Ueli Koch, Ivan Shorubalko, Andras Halbritter, Juerg Leuthold
Summary: The resistance state of filamentary memristors can be adjusted by relocating a few atoms in the active region of the conducting filament. The technology shows promise in downsizing, energy efficiency, and speed. However, the mechanisms and limitations of ultra-fast resistive switching need to be clarified for high-frequency applications. In this study, bipolar, multilevel resistive switchings were investigated in tantalum pentoxide based memristors with picosecond time resolution.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Larry R. Dalton, Juerg Leuthold, Bruce H. Robinson, Christian Haffner, Delwin L. Elder, Lewis E. Johnson, Scott R. Hammond, Wolfgang Heni, Claudia Hosessbacher, Benedikt Baeuerle, Eva De Leo, Ueli Koch, Patrick Habegger, Yuriy Fedoryshyn, David Moor, Ping Ma
Summary: The growth of integrated photonics has led to the demand for efficient electrical-to-optical signal conversion and photodetection over a wide range of frequencies. Nanophotonic devices with small feature sizes enable high-performance materials to be utilized to their maximum potential. Hybrid organic/semiconductor nanophotonic integration has improved understanding of material properties and provided stable alternatives to traditional thermoplastic EO polymers. The interrelationship between hybrid device architectures and materials needs to be considered for further advancements.
Article
Engineering, Electrical & Electronic
Hande Ibili, Tobias Blatter, Michael Baumann, Laurenz Kulmer, Boris Vukovic, Jasmin Smajic, Juerg Leuthold
Summary: This article introduces a theory and equivalent circuit models for designing and optimizing plasmonic modulator antennas. The proposed models aim to improve the understanding of the powerful antenna field enhancement and provide optimized antenna structures and parameters.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Michal Maciejewski, Bernhard Auchmann, Douglas Martins Araujo, Giorgio Vallone, Juerg Leuthold, Jasmin Smajic
Summary: This paper presents a methodology for collaborative modeling based on model-based systems engineering. The methodology consists of three pillars: encapsulated computing environments with service query interface, model notebooks with auto-generated model views, and model query interface with results caching. The methodology aims to achieve decentralized multi-model and multi-scale collaboration while maintaining traceability and reproducibility. It is demonstrated with a multi-model coil design optimization of a high-field superconducting magnet.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Review
Optics
Alexander Dorodnyy, Jasmin Smajic, Juerg Leuthold
Summary: Mie scattering is used to manipulate electromagnetic fields for various applications such as strong resonant enhancement, perfect absorption of radiation, and polarization/wavelength selectivity. Recent applications include light spectrum control, detection, non-linear effects enhancement, and emission. It is also demonstrated that a periodic arrangement of Mie scatterers can lead to a significant absorption enhancement in weakly absorbing layers.
LASER & PHOTONICS REVIEWS
(2023)
Article
Chemistry, Multidisciplinary
Ulle-Linda Talts, Helena C. Weigand, Gregoire Saerens, Peter Benedek, Joel Winiger, Vanessa Wood, Jurg Leuthold, Viola Vogler-Neuling, Rachel Grange
Summary: Researchers demonstrate a nanoimprinted nonlinear barium titanate 2D nanohole array that exhibits optical properties of a 2D photonic crystal and a metasurface. The structure is achieved through soft nanoimprint lithography, with enhanced second-harmonic generation by a factor of 18, showcasing the potential of this technique in flexible fabrication of barium titanate photonic devices.
Proceedings Paper
Engineering, Electrical & Electronic
Marco Eppenberger, Bertold Ian Bitachon, Andreas Messner, Wolfgang Heni, David Moor, Laurenz Kulmer, Patrick Habegger, Marcel Destraz, Eva De Leo, Norbert Meier, Nino Del Medico, Claudia Hoessbacher, Benedikt Baeuerle, Juerg Leuthold
Summary: A high-speed and compact plasmonic organic racetrack modulator is demonstrated to have orders of magnitude higher stability against changes in operating conditions compared to resonant modulators based on plasma dispersion effect, while maintaining thermal tunability. Stable operation at 80 degrees Celsius without degradation is achieved.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
