Article
Engineering, Electrical & Electronic
Omid Jafari, Wei Shi, Sophie LaRochelle
Summary: "The paper explores the efficiency-speed tradeoff in slow-light silicon photonic modulators, presenting comprehensive models and comparing them to experiments. It also examines design strategies to reduce V-pi of conventional MZMs, finding that the slow-light effect offers the best overall performance among different approaches."
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Guangwei Cong, Yuriko Maegami, Morifumi Ohno, Koji Yamada
Summary: In this study, non-TW carrier-depletion MZMs with densely meandered phase shifters were demonstrated to achieve better compromises and high bandwidth, improving the integration density of modulators in wavelength-division multiplexing transceivers. The experiment reached up to 28.1 Gbps NRZ eye diagrams and 26 GHz electro-optic bandwidth. Proposed lumped circuit models explained the data, indicating impedance mismatching and LC resonance play key roles in determining experimental bandwidth. Further driving configurations with better impedance matching were proposed to enhance bandwidth.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Computer Science, Information Systems
Changhao Han, Zhaoyi Hu, Yuansheng Tao, Engang Fu, Yandong He, Fenghe Yang, Jun Qin, Xingjun Wang
Summary: This paper investigates the performance degradation effects on high-speed silicon Mach-Zehnder modulators under proton radiation for future space environment applications. The results demonstrate a significant reduction in modulation efficiency and eye diagram quality after proton radiation, with the degradation increasing with higher radiation fluence. The study also reveals the existence of different transmission states under different fluence levels.
SCIENCE CHINA-INFORMATION SCIENCES
(2022)
Article
Optics
Dennis Maes, Sam Lemey, Gunther Roelkens, Mohammed Zaknoune, Vanessa Avramovic, Etienne Okada, Pascal Szriftgiser, Emilien Peytavit, Guillaume Ducournau, Bart Kuyken
Summary: Integrated photonics is a promising technology for telecommunication and data communication applications, and silicon nitride (SiN) is an interesting platform due to its low-loss waveguides. However, active devices are lacking, and hybrid integration is needed. In this study, high-speed uni-traveling-carrier photodiodes were successfully integrated into a SiN-platform using micro-transfer-printing, enabling high-performance detectors. The integrated detectors showed high responsivity, low dark current, and bandwidth, and demonstrated potential for terahertz communication.
Article
Optics
Xinyu Su, Guolei Liu, Hongyan Yu, Dasai Ban, Niping Deng, Feng Qiu
Summary: This study presents an electro-optic polymer/silicon hybrid metasurface modulator with a high modulation bandwidth, utilizing a specially designed high-Q resonance structure for high-speed and low-energy applications in intelligent tunable metasurfaces and space optical communication.
Article
Materials Science, Multidisciplinary
GIlles F. Feutmba, Leandro Da Silva, Nishant Singh, Laurens Breyne, Kobe De Geest, John Puthenparampil George, Johan Bauwelinck, Dries Van Thourhout, Xin Yin, Jeroen Beeckman
Summary: The increasing demand for high data rates and low power consumption challenges the capabilities of silicon photonics. The integration of optical ferro-electric materials on the silicon on insulator (SOI) platform enhances its functionality. PZT thin films deposited on SOI substrates show promising relative permittivity and dielectric loss at high frequencies, enabling the possibility of achieving bandwidths beyond 60GHz in next generation data communication systems using Mach-Zehnder modulators.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Minkyu Kim, Youngkwan Jo, Stefan Lischke, Christian Mai, Lars Zimmermann, Woo-Young Choi
Summary: This paper presents a large-signal SPICE model for the depletion-type silicon ring modulator that includes temperature dependence, allowing easy simulation of RM modulation characteristics in SPICE. The accuracy of the model is verified through measurement results of 25-Gb/s NRZ modulation at different temperatures. Additionally, simulation of the temperature-dependent transient responses of the RM and the RM temperature control circuit is demonstrated in the standard IC design environment.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Xin Fu, Shanglin Yang, Jiaqi Niu, Gaolu Zhang, Hao Jia, Lin Yang
Summary: Mode-division multiplexing is a promising technique for increasing channel capacity in optical communications. This letter presents a high-speed tunable dual-mode converter based on the silicon-on-insulator platform for MDM networks. Experimental results demonstrate its potential as a pivotal component in high-speed MDM networks.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Yosuke Hinakura, Daichi Akiyama, Hiroyuki Ito, Toshihiko Baba
Summary: This study introduces a silicon photonic crystal waveguide slow light Mach-Zehnder modulator, which enhances modulation efficiency and maintains a wide working spectrum. By matching the phase using meanderline electrodes, the cutoff frequency is significantly improved, demonstrating high-speed modulation capabilities.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Dusan Gostimirovic, Winnie N. Ye
Summary: The orientation and positioning of pn junctions play a crucial role in the performance of optoelectronic modulators, with vertical pn junctions showing promise in improving energy efficiency. New designs such as double vertical junctions offer increased interaction length and energy efficiency improvements. Comprehensive numerical comparisons demonstrate the potential of these new designs in enhancing power performance characteristics.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Brian Murray, Cleitus Antony, Giuseppe Talli, Paul D. Townsend
Summary: This study demonstrates the use of electrical precompensation for high-speed operation of lumped MZMs through experiment and simulation. A precise equivalent circuit model is fitted to S11 measurements to analyze design trade-offs in terms of system performance, energy consumption, and drive voltage requirements. The results show that careful selection of source resistance with respect to electrode and packaging inductance is crucial for high-speed modulation. Increasing the electrode inductance is shown to be beneficial as it allows optimum performance with a higher source impedance. Furthermore, combining precompensation with a slight inductive peaking and optimized source resistance is demonstrated to reduce drive voltage requirements and energy dissipation in the circuit.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Tadashi Murao, Jun Ushida, Hiroyuki Takahashi, Masatoshi Tokushima, Akemi Shiina, Tsuyoshi Horikawa
Summary: This study presents a compact behavioral model of optical phase shifters for silicon modulators, reducing testing time and enabling fast extraction of manufacturing variability parameters. The constructed model adequately explains experimental results and demonstrates its application in the C-band wavelength.
OPTICS COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Zhaoyang Zhang, Hui Yu, Qikai Huang, Zhiyan Zhou, Bei Chen, Tingge Dai, Huiye Qiu, Yuehai Wang, Jianyi Yang
Summary: We demonstrate a silicon 1x64 optical phased array using carrier-depletion-based phase shifters. The phase shifter has a wide bandwidth, high modulation efficiency, and low power consumption, and can achieve a large range of beam steering. Beam steering in the phased-array axis is realized by tuning the phase of each antenna, while in the wavelength-controlled axis, dispersion efficiency is achieved by tuning the wavelength. The results show that the carrier-depletion-based OPA is a promising candidate for future high-speed and power-efficient solid-state Lidars.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Seonjun Choi, Changhwan Choi, Jae Kyeong Jeong, Yun-Heub Song
Summary: In this article, the authors propose silicon-nitride-pillar (SNP) and silicon-pillar (SP) structures that can be applied to a 3-D nand flash structure. Through device simulation, the authors verify the erase performance of these structures and find that they have a fast erase speed and the ability to prevent breakdown, making them more than 100 times faster than the existing structure.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Energy & Fuels
Guangtao Yang, Bas van de Loo, Maciej Stodolny, Gianluca Limodio, Jimmy Melskens, Bart Macco, Paula Bronsveld, Olindo Isabella, Arthur Weeber, Miro Zeman, W. M. M. Kessels
Summary: This study investigates the application of Al_2O_3 prepared by atomic layer deposition as a hydrogenating capping layer for polycrystalline silicon passivating contacts. Results show that Al_2O_3/SiN_x stack greatly enhances passivation quality for various types of poly-Si layers, providing guidelines for significantly improving their passivation performance.
IEEE JOURNAL OF PHOTOVOLTAICS
(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
Optics
Emiel Dieussaert, Roel Baets, Yanlu Li
Summary: This paper introduces a novel method to realize a multi-beam optical frequency shifting component for photonic integrated circuits. The component can generate multiple optical beams with different frequency shifts, making it suitable for various systems.
Article
Chemistry, Analytical
Yanlu Li, Emiel Dieussaert
Summary: This study proposes a compensation method for demodulated data in optical coherent detection systems, effectively addressing nonlinearities. The method segments, fits, and removes baselines in distorted signals to obtain precise distortion shapes for compensation.
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
Wim Bogaerts, Alain Yuji Takabayashi, Pierre Edinger, Gaehun Jo, Iman Zand, Peter Verheyen, Moises Jezzini, Hamed Sattari, Giuseppe Talli, Cleitus Antony, Mehrdad Saei, Cristina Lerma Arce, Jun Su Lee, Arun Kumar Mallik, Saurav Kumar, Marco Garcia, Tigers Jonuzi, Kristinn B. Gylfason, Niels Quack, Frank Niklaus, Umar Khan
Summary: This paper presents a method to extend silicon photonics with MEMS actuators for low-power, large scale programmable photonic circuits. By adding free-standing movable waveguides to the existing silicon photonics platform, phase shifters and tunable couplers can be implemented using electrostatically actuated MEMS. The MEMS devices are protected using wafer-level sealing and interfaced with custom multi-channel driver and readout electronics.
SMART PHOTONIC AND OPTOELECTRONIC INTEGRATED CIRCUITS 2022
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Jing Zhang, Emadreza Soltanian, Bahawal Haq, Stefan Ertl, Johanna Rimbock, Bozena Matuskova, Emanuele Pelucchi, Agnieszka Gocalinska, Joris Van Campenhout, Guy Lepage, Peter Verheyen, Wim Bogaerts, Gunther Roelkens
Summary: We present a C-band optical transmitter with an integrated widely-tunable III-V-on-silicon laser, fabricated using micro-transfer printing on the imec iSiPP50G platform. The back-to-back operation at 40 Gbit/s non-return-to-zero On-Off keying over the C-band is demonstrated.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)