Article
Engineering, Electrical & Electronic
M. Kohli, D. Chelladurai, A. Messner, Y. Horst, D. Moor, J. Winiger, T. Blatter, T. Buriakova, C. Convertino, F. Eltes, M. Zervas, Y. Fedoryshyn, U. Koch, J. Leuthold
Summary: This paper presents a high-speed plasmonic barium titanate (BTO, BaTiO3) Mach-Zehnder modulator. The modulator combines nanoscale plasmonics with BTO as solid-state active material and silicon nitride (SiN) for waveguiding, and integrates them in a monolithic platform. Experimental results show that the modulator has a flat electro-optic frequency response up to 70 GHz and a low V pi L product of 144 V mu m. The modulator can achieve data rates of 216 Gbit/s with a 216GBd 2PAM signal and 256 Gbit/s with a 128GBd 4PAM signal. The integration of the silicon nitride platform with high-speed plasmonics using BTO is a promising solution for future Tb/s optical interconnect platforms.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Prashanta Kharel, Christian Reimer, Kevin Luke, Lingyan He, Mian Zhang
Summary: Thin-film lithium niobate modulators offer improved voltage-bandwidth performance but face challenges in high-frequency electro-optic performance due to increased microwave losses from reduced electrode gaps. By utilizing micro-structured electrodes, researchers achieved a record combination of low RF half-wave voltage (V-pi) of 1.3 V while maintaining electro-optic response with 1.8 dB roll-off at 50 GHz.
Article
Computer Science, Information Systems
Yi Luo, Changzheng Sun, Bing Xiong, Jian Wang, Zhibiao Hao, Yanjun Han, Hongtao Li, Lai Wang
Summary: In this paper, the authors present their work on high-speed optoelectronic devices, including semiconductor lasers, electro-optic modulators, and photodetectors, as well as their applications in fiber communications and microwave photonics.
SCIENCE CHINA-INFORMATION SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Jialing Jian, Jianghong Wu, Chuyu Zhong, Hui Ma, Boshu Sun, Yuting Ye, Ye Luo, Maoliang Wei, Kunhao Lei, Ruizhe Liu, Zequn Chen, Guangyi Li, Hao Dai, Renjie Tang, Chunlei Sun, Junying Li, Wei Li, Ming Li, Hongtao Lin, Lan Li
Summary: In this study, a high-speed PdSe2-plasmonic waveguide-integrated photodetector is proposed and experimentally verified, demonstrating excellent performance metrics and wide-ranging application prospects.
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
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This study investigates photonic-crystal-like devices and microcavities in graphene. The results show that these graphene-based devices can be significantly smaller in size compared to conventional photonic crystals, thanks to the shorter optical transport wavelength in graphene. By changing the applied voltage, the functionality of the devices can be altered, making them highly programmable and adjustable. Furthermore, these devices can be integrated with traditional microelectronic circuits, leading to potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xiong Deng, Shen Shen, Yanli Xu, Jiangtao Liu, Jun Li, Zhenhua Wu
Summary: This theoretical study investigates photonic-crystal-like devices and microcavities in graphene. The results show that graphene-based devices can be scaled down significantly compared to conventional photonic crystals due to the shorter optical transport wavelength in graphene. The devices have high programmability and can be integrated with traditional microelectronic circuits, offering potential applications in photonic integrated circuits and computing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Mengyue Xu, Mingbo He, Yuntao Zhu, Siyuan Yu, Xinlun Cai
Summary: This study demonstrates a flat-top optical frequency comb (OFC) generator based on high-performance lithium niobate on insulator modulators. The generator exhibits low on-chip loss, low driving voltage over a wide frequency range, and a large electro-optic bandwidth.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
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
Multidisciplinary Sciences
Hitesh Agarwal, Bernat Terres, Lorenzo Orsini, Alberto Montanaro, Vito Sorianello, Marianna Pantouvaki, Kenji Watanabe, Takashi Taniguchi, Dries Van Thourhout, Marco Romagnoli, Frank H. L. Koppens
Summary: By showcasing the integration of 2D-3D dielectrics in a double-layer graphene EA modulator, this research has successfully overcome the trade-off between high speed and large modulation efficiency. The new material combination enables the modulator device to achieve higher performance, with a bandwidth of approximately 39 GHz and a three-fold increase in modulation efficiency compared to previously reported high-speed modulators.
NATURE COMMUNICATIONS
(2021)
Review
Chemistry, Multidisciplinary
Fei Xue, Chenhui Zhang, Yinchang Ma, Yan Wen, Xin He, Bin Yu, Xixiang Zhang
Summary: With the advancement of Internet of Things and big data, there is a growing need for high-performance memory hardware. 2D materials, with their excellent electronic properties, offer a promising solution for developing advanced memory device arrays. In recent years, there has been rapid development in 2D-material-based memory devices, which can be used for brain-inspired computing and sensing. This article provides a comprehensive overview of the latest research and discusses future research directions.
ADVANCED MATERIALS
(2022)
Article
Physics, Applied
Yunfei He, Shangyi Chen, Merrilyn Mercy Adzo Fiagbenu, Chloe Leblanc, Pariasadat Musavigharavi, Gwangwoo Kim, Xingyu Du, Jiazheng Chen, Xiwen Liu, Eric A. Stach, Roy H. Olsson, Deep Jariwala
Summary: This letter presents the oriented growth and switching of thin ferroelectric aluminum scandium nitride (AlScN) films directly on degenerately doped 4H silicon carbide (SiC) wafers. The high-quality thin Al0.68Sc0.32N films on doped SiC substrates enable the monolithic integration of nonvolatile memory with SiC-based logic devices suitable for high temperature operation as well as high-power switching, memory, and sensing applications.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Wei Liu, Jiawen Liao, Hongjun Cai, Yu Yu, Xinliang Zhang
Summary: This paper presents a novel integrated polarization stabilizer with a small footprint and fast response time. The stabilizer can track light with arbitrary polarization states in one-time manipulation and convert most of the light to horizontal linear polarization.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Yanxia Lin, Shibo Liang, Lin Xu, Lijun Liu, Qianlan Hu, Chenwei Fan, Yifan Liu, Jie Han, Zhiyong Zhang, Lian-Mao Peng
Summary: In this study, enhancement-mode (E-mode) FETs based on aligned carbon nanotube films were fabricated with high carrier mobility and improved subthreshold swing. The fabricated FETs showed performance exceeding commercial Si-based transistors, and ring oscillators exhibited record propagation gate delay among CNT- and other nanomaterial-based ICs.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Optics
Svetlana P. Kotova, Evgeny P. Pozhidaev, Sergey A. Samagin, Vladimir V. Kesaev, Vadim A. Barbashov, Sofia Torgova
Summary: Experimental results show that a planar aligned 50 μm thick layer of ferroelectric liquid crystal mixture can be used as an electro-optical medium for phase spatial light modulators. The electrically controlled spiral phase plate constructed in this study is able to form and reconfigure vortex light fields at frequencies up to 3 kHz, surpassing previous liquid crystal spatial light modulators.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Multidisciplinary Sciences
Binbin Chen, Nicolas Gauquelin, Nives Strkalj, Sizhao Huang, Ufuk Halisdemir, Minh Duc Nguyen, Daen Jannis, Martin F. Sarott, Felix Eltes, Stefan Abel, Matjaz Spreitzer, Manfred Fiebig, Morgan Trassin, Jean Fompeyrine, Johan Verbeeck, Mark Huijben, Guus Rijnders, Gertjan Koster
Summary: The study presents asymmetric oxide superlattices fabricated on silicon, which exhibit enhanced out-of-plane polarization by utilizing coherent strain. Optical measurements reveal a stronger out-of-plane polarized state in the superlattices. Additionally, the coherent strain suppresses the magnetism of the oxide films.
NATURE COMMUNICATIONS
(2022)
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
Optics
Jacqueline Geler-Kremer, Felix Eltes, Pascal Stark, David Stark, Daniele Caimi, Heinz Siegwart, Bert Jan Offrein, Jean Fompeyrine, Stefan Abel
Summary: Researchers demonstrate a multilevel non-volatile phase shifter memory that is based on the integration of BaTiO3 thin films and silicon waveguides, achieving analogue and non-volatile optical phase tuning. This study adds an analogue non-volatile photonic element to the integrated photonics toolbox, enabling a new generation of power-efficient programmable photonic circuits.
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)
