Article
Optics
Lorenz Weiss, Andreas Gritsch, Benjamin Merkel, Andreas Reiserer
Summary: Resonant spectroscopy of erbium implanted into nanophotonic silicon waveguides reveals 1 GHz inhomogeneous broadening and homogeneous linewidths below 0.1 GHz, introducing a promising materials platform for on-chip quantum information processing.
Article
Optics
Thi Thuy Duong Dinh, Xavier Le Roux, Jianhao Zhang, Miguel Montesinos-Ballester, Christian Lafforgue, Daniel Benedikovic, Pavel Cheben, Eric Cassan, Delphine Marris-Morini, Laurent Vivien, Carlos Alonso-Ramos
Summary: Flexible control of modal confinement in silicon photonic waveguides is achieved using a new strategy that utilizes metamaterial engineering of the waveguide core and cladding. The proposed dual-material geometry allows independent control of the index contrast in the vertical and horizontal directions. Experimental results show that the dual-metamaterial waveguides exhibit similar measured quality factors and better calculated bulk sensitivity compared to strip waveguides.
LASER & PHOTONICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Pei-Hsun Wang, Shang-Pu Wang, Nien-Lin Hou, Zong-Ren Yang, Wei-Hao Huang, Tien-Hsiang Lee
Summary: We demonstrate the manipulation of waveguide dispersion by lithographically patterning the polymer cladding on silicon nitride waveguide resonators. Both normal and anomalous dispersion can be achieved within the same waveguide dimension on an integrated photonic chip. This process has no impact on waveguide loss and quality factor, providing flexibility for designable dispersion on a universal photonic platform. Additionally, a relatively low dispersion is demonstrated by adjusting the coverage ratio of cladding, making zero-dispersive waveguide resonators possible.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Stephan Rinner, Florian Burger, Andreas Gritsch, Jonas Schmitt, Andreas Reiserer
Summary: Quantum memories integrated into nanophotonic silicon devices show the potential for large quantum networks and scalable photonic quantum computers. In particular, erbium dopants are attractive due to their optical transitions in the telecommunications frequency band and long coherence time. We successfully integrate these emitters into commercially fabricated low-loss waveguides and observe the splitting of electronic spin states in a magnetic field up to 9 T. This advancement contributes to the development of long-lived quantum memories using CMOS technology.
Article
Engineering, Electrical & Electronic
Zhixiang Deng, Jin Zhang, Dianyuan Fan, Lifu Zhang
Summary: In this study, a numerical simulation was carried out to demonstrate an effective spectral conversion scheme that can directly generate mid-infrared light in a silicon nitride integrated photonics waveguide. Wideband conversions primarily occur near the traditional red-shift phase-matching point without adjusting the waveguide geometry. The conversion mechanisms involve nonlinear interaction of optical waves, including dispersive wave generation, soliton-probe collision, and phase-sensitive scattering processes.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Review
Optics
Yuxi Fang, Changjing Bao, Si-Ao Li, Zhi Wang, Wenpu Geng, Yingning Wang, Xu Han, Jicong Jiang, Weigang Zhang, Zhongqi Pan, Zhaohui Li, Yang Yue
Summary: Supercontinuum (SC) has wide applications in optical communications, signal processing, metrology, and spectroscopy. This paper reviews the latest progress on various nanophotonic waveguides for Supercontinuum generation (SCG), including the discussion of different materials and their properties, the consideration of waveguide properties, and the analysis of different broadening mechanisms. It also provides perspectives on the spectral coverage, dispersion curves, and novel materials for SCG in nanophotonic waveguides.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Chenghan Wu, Tom Reep, Steven Brems, Julien Jussot, Vivek Mootheri, Joris Van Campenhout, Cedric Huyghebaert, Marianna Pantouvaki, Zheng Wang, Dries Van Thourhout
Summary: This paper presents an experimental and theoretical investigation of a graphene-integrated electro-absorption modulator (EAM) based on a slot waveguide. The device exhibits impressive modulation efficiency and bandwidth due to the enhanced light-matter interaction of graphene. Furthermore, extensive design studies were carried out to explore the trade-offs in insertion loss, extinction ratio, and bandwidth, providing valuable insights into the influence of each design parameter. It is important to note that the slot waveguide can be seamlessly integrated into high-density systems through standard deep ultraviolet lithography.
Article
Physics, Applied
Ying Wang, Ravitej Uppu, Xiaoyan Zhou, Camille Papon, Sven Scholz, Andreas D. Wieck, Arne Ludwig, Peter Lodahl, Leonardo Midolo
Summary: The study focused on analyzing the electroabsorption in thin GaAs/Al0.3Ga0.7As nanophotonic waveguides with an embedded p-i-n junction. Transmission measurements of waveguides of different lengths were used to derive the propagation loss in relation to the electric field, wavelength, and temperature. The results, in agreement with the Franz-Keldysh model, are crucial for understanding the loss in nanophotonic devices operating in the emission range of self-assembled InAs semiconductor quantum dots towards scalable quantum photonic integrated circuits.
APPLIED PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Jan Barowski, Lisa Schmitt, Kristof Kother, Martin Hoffmann
Summary: This contribution presents a design approach and characterization results for dielectric slot waveguides in highly resistive silicon for operation in the terahertz frequency range. The authors discuss the fundamentals and figures of merit of dielectric slot waveguides and present analytical solutions and numerical results from field simulations. Prototypes are fabricated using a process for HR-Si MEMSs, including a silicon-based metamaterial for mechanical support. The devices are measured and characterized using VNA-based two-port measurements, and the obtained losses are reported for the first time.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Optics
Eva Kempf, Pedro Rojo Romeo, Alban Gassenq, Arnaud Taute, Paul Chantraine, Jimmy John, Ali Belarouci, Stephane Monfray, Frederic Boeuf, Paul G. Charette, Regis Orobtchouk
Summary: This work presents a design of a half-etch horizontal slot waveguide based on SiN, where the upper SiN layer is selectively etched to confine the mode laterally. The numerical modeling, fabrication, and characterization of passive waveguiding components are discussed. The fabricated racetrack resonators demonstrate the high potential of these horizontal slot waveguides for active integrated photonics applications.
Article
Chemistry, Physical
Aaron M. M. Day, Jonathan R. R. Dietz, Madison Sutula, Matthew Yeh, Evelyn L. L. Hu
Summary: In this study, we demonstrate the direct laser writing of cavity-integrated spin defects using a nanosecond pulsed above-bandgap laser, allowing real-time monitoring of silicon-monovacancy defect formation within the cavity-mode volume. We observe spin resonance, cavity-integrated photoluminescence, and excited-state lifetimes consistent with conventional methods, without the need for post-irradiation thermal annealing. This localized defect formation method, combined with cavity-integrated defect spins, is crucial for engineering cavity-emitter coupling for quantum networking.
Article
Optics
Ruolan Yu, Jie Zhang, Weiwei Chen, Pengjun Wang, Yan Li, Jun Li, Qiang Fu, Tingge Dai, Hui Yu, Jianyi Yang
Summary: This paper presents and investigates three optical reversible logic gates utilizing graphene-silicon slot waveguides, achieving relatively compact and broadband performance through the design of cascaded Mach-Zehnder interferometers and multimode interference couplers for Toffoli, Peres, and Fredkin gates. Variations in chemical potential lead to significant changes in effective refractive index, allowing for efficient operation with specific parameters at 1550 nm. Extinction ratios and crosstalk levels are also analyzed for the designed gates.
Article
Optics
Qiyuan Li, Xinzhe Xiong, Zhiwei Yan, Guanglian Cheng, Fanglu Xu, Zengfan Shen, Qiyuan Yi, Yu Yu, Li Shen
Summary: This paper proposes and investigates a graphene-based electro-absorption modulator and microring modulator for communication and detection systems in the mid-infrared region. These modulators, using a suspended germanium waveguide platform and incorporating double-layer graphene, demonstrate high modulation performance and bandwidth.
Article
Engineering, Electrical & Electronic
Yuan-Ting Shih, Kuo-Fang Chung, Ding-Wei Huang
Summary: In this study, a partial parabolic single layer crossing was designed for photonic sensors using a new fabrication process. The crossing structure was modified to accommodate different input states. Experimental results showed that this structure achieved high transmission and low crosstalk, while also offering advantages such as simplified fabrication processes, reduced cost, and smaller device size.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Xiaodong Shi, Jingjing Zhang, Weichen Fan, Yaoqin Lu, Nianhua Peng, Karsten Rottwitt, Haiyan Ou
Summary: This study proposes a compact coupling scheme for silicon carbide polarization beam splitter, which enables efficient low-birefringence polarization splitting by modulating the magnetic mode distribution. The performance of the device is experimentally validated.
PHOTONICS RESEARCH
(2022)
Article
Biology
Sofia Lage-Vickers, Juan Bizzotto, Maria Pia Valacco, Pablo Sanchis, Sergio Nemirovsky, Estefania Labanca, Carlos Scorticati, Osvaldo Mazza, Antonina Mitrofanova, Nora Navone, Elba Vazquez, Javier Cotignola, Geraldine Gueron
Summary: This study identifies high YWHAZ and NDRG1 expression as molecular biomarkers associated with poor prognosis in prostate cancer patients, defining two subgroups with high and intermediate risk of disease progression. YWHAZ outperforms Gleason score in predicting aggressiveness of prostate cancer beyond 60 months post-diagnosis.
COMMUNICATIONS BIOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Jorge Parra, Todora Ivanova, Mariela Menghini, Pia Homm, Jean-Pierre Locquet, Pablo Sanchis
Summary: Vanadium dioxide (VO2) is a promising material for developing hybrid photonic integrated circuits (PICs) due to its insulating-to-metal transition triggered by light. All-optical absorption switch using a hybrid VO2/Si waveguide is demonstrated with fast switching speed and low energy consumption, showing potential for developing all-optical and broadband silicon PICs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Review
Optics
Jorge Parra, Irene Olivares, Antoine Brimont, Pablo Sanchis
Summary: The article discusses the current developments in achieving nonvolatile switching in silicon photonic waveguide devices, either through device engineering or hybrid integration with unique optical materials. Several approaches with high potential for evolving towards nonvolatile behavior with enhanced performance are being explored, although many development steps are still necessary to ensure reliable devices.
LASER & PHOTONICS REVIEWS
(2021)
Article
Engineering, Electrical & Electronic
Irene Olivares, Jorge Parra, Pablo Sanchis
Summary: The study introduces a new photonic memory device named SAHAS configuration, which enables programmable erasable functionality compatible with the silicon platform. The device shows efficient performance, low energy consumption, long retention times, and superior optical characteristics.
IEEE PHOTONICS JOURNAL
(2021)
Article
Multidisciplinary Sciences
Jorge Parra, Wolfram H. P. Pernice, Pablo Sanchis
Summary: The study explores the unique light-matter interaction of epsilon-near-zero (ENZ) materials for all-optical phase control in nanophotonic silicon waveguides. By using ENZ materials as an efficient optical heat source, thermo-optic all-optical phase tuning is achieved with low insertion loss and high control efficiency. This proposal offers a new approach to achieve on-chip, low-loss phase tuning in silicon photonic circuits.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Irene Olivares, Pablo Sanchis
Summary: The use of SiGe slot approach as a different route to enhance the strain induced Pockels effect in the mid-IR range has the potential to significantly improve the efficiency and performance of silicon devices in silicon photonics field.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
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
Chemistry, Multidisciplinary
Konstantinos Papatryfonos, David R. Selviah, Avi Maman, Kobi Hasharoni, Antoine Brimont, Andrea Zanzi, Jochen Kraft, Victor Sidorov, Marc Seifried, Yannick Baumgartner, Folkert Horst, Bert Jan Offrein, Katarzyna Lawniczuk, Ronald G. Broeke, Nikos Terzenidis, George Mourgias-Alexandris, Mingchu Tang, Alwyn J. Seeds, Huiyun Liu, Pablo Sanchis, Miltiadis Moralis-Pegios, Thanasis Manolis, Nikos Pleros, Konstantinos Vyrsokinos, Bogdan Sirbu, Yann Eichhammer, Hermann Oppermann, Tolga Tekin
Summary: The recent advances in photonic-electronic integration achieved in the European research project L3MATRIX include fabrication of 2D silicon photonics arrays, development of novel modulation schemes, integration of DFB laser sources, and demonstration of chiplet configuration for the 2D photonic arrays. These technologies will address the next generation of computing challenges.
APPLIED SCIENCES-BASEL
(2021)
Letter
Optics
Jorge Parra, Juan Navarro-Arenas, Mariela Menghini, Maria Recaman, Jean Pierre-Locquet, Pablo Sanchis
Summary: This work presents an optical limiter based on silicon photonics with an ultracompact VO2/Si waveguide, featuring a thermal tunable threshold power of only about 3.5 mW and broadband spectral characteristics. It offers a new pathway towards integrated optical limiters for dense and low-power photonic integrated circuits.
Article
Optics
Juan Navarro-Arenas, Jorge Parra, Pablo Sanchis
Summary: This article investigates the behavior of ultrafast all-optical phase switching in TCO-silicon waveguides through numerical simulation. The study reveals the best compromise between energy consumption, insertion losses, and phase change per unit length.
Article
Optics
B. Chmielak, S. Suckow, J. Parra, V. C. Duarte, T. Mengual, M. A. Piqueras, A. L. Giesecke, M. C. Lemme, P. Sanchis
Summary: An enhanced grating coupler design based on an amorphous silicon layer on top of silicon nitride is proposed to improve the directionality of the coupler, while maintaining low waveguide losses.
Article
Engineering, Electrical & Electronic
Juan Navarro-Arenas, Jorge Parra, Pablo Sanchis
Summary: In this work, the performance of different transparent conducting oxide (TCO) materials, including doped cadmium oxide, aluminum doped zinc oxide, and indium tin oxide, integrated into a hybrid silicon photonic waveguide is compared. The best operational parameters for high-performance and energy-efficient all-optical switching are achieved by using TCOs with moderate mobility but more environmentally-friendly. By using an AZO/Si amplitude switch, extinction ratios of 10 dB center dot mu m(-1) and insertion losses of 2 dB center dot mu m(-1) are achieved with an energy consumption of only 90 fJ, showing the potential of cadmium-free TCO materials in building high-performance all-optical switches on silicon.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Juan Navarro-arenas, Jorge Parra, Pablo Sanchis
Summary: Artificial neural network-based electro-optic chipsets have great potential due to their remarkable energy efficiency, dense wavelength parallelization possibilities, and ultrafast modulation speeds. This study introduces the concept of complex-valued neural networks (CVNNs) implemented through photonic hardware, and presents a design and simulation demonstration of an electro-optical dual phase and amplitude modulator using a transparent conducting oxide (TCO) in a silicon waveguide structure. The device operates near the epsilon-near-zero (ENZ) condition, which enhances the optical-field confinement effect and allows for electro-optical tuning in TCOs. The proposed device serves as a complex-valued activation function for photonic neural systems and its performance is evaluated through simulation.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Education & Educational Research
Borja Vidal, M. Loreto Fenollosa Ribera, Francisco Javier Ribal, Pablo Sanchis, Jaime Garcia-Ruperez, M. Amparo Bes-Pia, E. Blasco-Tamarit, Patricia Noguera, Maria Jose Munoz-Portero, Luis A. Tortajada
Summary: This study explores students' preferences for learning methods in seven engineering disciplines at a Spanish technical university, finding that project-based learning and problem-based learning are perceived as more effective. Results also suggest that students can be classified into two groups based on their level of activeness in learning.
JOURNAL OF APPLIED RESEARCH IN HIGHER EDUCATION
(2022)
Article
Optics
Sebastien Cueff, Jimmy John, Zhen Zhang, Jorge Parra, Jianing Sun, Regis Orobtchouk, Shriram Ramanathan, Pablo Sanchis
