Article
Optics
Victor Vassiliev, Michael Sumetsky
Summary: By experimenting, it is demonstrated that the side-coupling of coplanar bent optical fibres can induce high Q-factor whispering gallery mode optical microresonators that are fully mechanically reconfigurable. The dimensions and free spectral range of these microresonators can vary within a wide range. The new microresonators may have applications in various fields, such as cavity QED, microresonator optomechanics, frequency comb generation with tuneable repetition rate, tuneable lasing, and tuneable processing and delay of optical pulses.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Physical
Kun Ye, Lixuan Liu, Congpu Mu, Kun Zhai, Shiliang Guo, Bochong Wang, Anmin Nie, Shuhan Meng, Fusheng Wen, Jianyong Xiang, Tianyu Xue, Ming Kang, Yongji Gong, Yongjun Tian, Zhongyuan Liu
Summary: Monolayer transition metal dichalcogenides have attracted significant interest as promising materials in atomic-scale optoelectronic devices. However, their practical applications are limited by low visible light absorption and negligible infrared response. In this study, the researchers have successfully enhanced light absorption and photoresponse in monolayer WSe2 crystals by growing triangular Sb2O3 microresonators on their surfaces. The introduction of Sb2O3 microresonators led to significantly enhanced visible light responsivity and expanded near infrared absorption. This work provides a new route for the development of high-performance monolayer TMDCs-based optoelectronic devices.
Article
Engineering, Electrical & Electronic
Lidan Lu, Lianqing Zhu, Zhoumo Zeng, Yiping Cui, Pei Yuan, Yuan Liu, Dongliang Zhang, Guanghui Ren
Summary: By using the photonic Fano formula and temporal coupled-mode theory, we studied the dependence of property parameters on Fano resonance in optical waveguide-based microresonators and found that the refractive index sensitivity of Fano-like resonators can be enhanced by adjusting the device parameters.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2022)
Article
Multidisciplinary Sciences
Alexey Tikan, Aleksandr Tusnin, Johann Riemensberger, Mikhail Churaev, Xinru Ji, Kenichi Nicolas Komagata, Rui Ning Wang, Junqiu Liu, Tobias J. Kippenberg
Summary: This paper investigates the generation of dissipative solitons in coupled resonators and reveals the advantages of this system over conventional single-resonator platforms. It shows that the accessibility of solitons varies for symmetric and antisymmetric supermode families. The study also finds that the coupling between transverse modes in coupled resonators can be substantially suppressed, leading to avoided mode crossings.
Article
Mathematics, Interdisciplinary Applications
Reza Ebrahimi
Summary: This paper predicts the nonlinear dynamic phenomena in electrostatically actuated microresonators and develops the nonlinear governing equations of motion based on Von Karman's theory and the Euler-Bernoulli beam model. The coupling of lateral and longitudinal vibrations is considered, and the partial differential equations are solved using the single-mode Galerkin's method and Runge-Kutta method. The effects of various system parameters on the microresonator response are investigated, and different analysis methods are employed to inspect the chaotic behavior of the microresonator. The results show that the microresonator exhibits various vibrational behaviors, including periodic, quasi-periodic, and chaotic motions. The longitudinal coupling effects have a significant impact on the routes to chaos and vibrational response of the microresonator at low actuation frequency. Therefore, the findings of this paper are important for the optimization and performance improvement of microresonators.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Engineering, Electrical & Electronic
Eyal Yacoby, Yosef London
Summary: Optical Whispering Gallery Mode (WGM) resonators are highly sensitive sensors and ideal for nonlinear interactions. A new type of WGM resonator called Saddle-Shape Microresonator (SSM) is demonstrated, which offers unique modal properties and structural stability. SSMs show great potential in strain-based sensing, cavity quantum electrodynamics, and real-life applications requiring mechanical tunability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Optics
Zhonghan Wu, Yiran Gao, Tian Zhang, Jian Dai, Kun Xu
Summary: This study investigates the switchability of dissipative cnoidal waves (DCWs) based on dual-coupled microresonators. The pulse number of DCWs can only be decreased unidirectionally when working as perfect soliton crystals, but can be switched bidirectionally when working as Turing rolls. The stable regions of DCWs can be greatly expanded due to the existence of avoided mode crossings (AMXs), which further liberates the application potential of microcombs in various fields.
Article
Physics, Multidisciplinary
M. Sumetsky
Summary: Researched the multi-quantum semiclassical theory of optical frequency comb (OFC) spectra generated by modulating parameters in an optical microresonator, and compared two different types of microresonators. Found that a Surface Nanoscale Axial Photonics (SNAP) bottle microresonator can generate similar OFCs with a smaller size.
NEW JOURNAL OF PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Wei Lin, Hao Zhang, Zhonghua Gong, Bo Liu, Haifeng Liu, Binbin Song, Jixuan Wu
Summary: This study theoretically analyzes nonreciprocal morphology-dependent resonance in spinning stacked microresonators based on the Sagnac-Fizeau effect, providing significant guidance for the design of nonreciprocal photonic devices. Fano resonance and mode splitting resonance in microresonators at different rotation frequencies are discussed, with simulation results expected to have promising applications in various fields such as unidirectional microcavity lasers and quantum optical communications.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Aleksandr Tusnin, Alexey Tikan, Kenichi Komagata, Tobias J. Kippenberg
Summary: This paper investigates the application of dissipative Kerr solitons (DKS) based microresonator frequency combs in coupled resonator systems. A model for a one-dimensional lattice of microresonators is derived, and two different dynamical regimes, elliptic and hyperbolic, are identified. Turing patterns, regularized wave collapse, and 2D DKS are studied in these regimes. The study also extends the system to the Su-Schrieffer-Heeger model, showing the dynamics of edge states and edge-bulk interactions initiated by edge-state DKS.
COMMUNICATIONS PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Geun Ho Ahn, Ki Youl Yang, Rahul Trivedi, Alexander D. White, Logan Su, Jinhie Skarda, Jelena Vuckovic
Summary: The automation of device design in photonics has been revolutionary, but the design of resonant devices has remained challenging due to their complex optimization landscapes. In this study, we propose a framework that maps the design of photonic resonators to nonresonant design problems, enabling flexible dispersion engineering and high-quality operation. The effectiveness of this framework is demonstrated both theoretically and experimentally.
Article
Physics, Fluids & Plasmas
Pranick R. Chamlagai, Dane Taylor, Per Sebastian Skardal
Summary: This study proposes a multiscale mechanism called grass-roots optimization of synchronization, where local optimizations of smaller subsystems cooperate to collectively optimize the entire system. The researchers found that grass-roots-optimized systems are comparable to globally optimized systems and have the additional advantage of being robust against targeted attacks or subsystem islanding. These findings motivate further investigation into the physics of local mechanisms that can support self-optimization for complex systems.
Article
Optics
Philippe Jean, Alexandre Douaud, Souleymane Toubou Bah, Sophie LaRochelle, Younes Messaddeq, Wei Shi
Summary: Through the investigation of the passive response and thermal behavior of the microresonator, we demonstrate the performance of thermally stable tantalum pentoxide microresonators directly coupled to silicon waveguides, capable of operating in both the over-coupled and near critical coupling regimes with low temperature-dependent wavelength shift.
Article
Engineering, Electrical & Electronic
Chaochao Ye, Chanju Kim, Yi Zheng, Yueguang Zhou, Ayman N. Kamel, Yanjing Zhao, Kresten Yvind, Minhao Pu
Summary: Microresonator-based optical frequency combs have wide-ranging applications and require dispersion control for soliton generation. Mode crossing in microresonators can disrupt dispersion and distort the comb spectrum. We present a robust waveguide design to suppress unintended mode crossing by manipulating the phase mismatch between coupling modes, demonstrated experimentally in the AlGaAs-on-insulator platform.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2023)
Article
Mathematics, Applied
Yongjiao Zhang, Igor Hoveijn, Konstantinos Efstathiou
Summary: We study the collective dynamics of globally connected coupled Winfree oscillators under external forcing. By numerical simulations and mean-field methods, we analyze the entrainment degree under different parameters and provide an approximation of the synchronization behavior.
Article
Optics
Xingchen Ji, Jae K. Jang, Utsav D. Dave, Mateus Corato-Zanarella, Chaitanya Joshi, Alexander L. Gaeta, Michal Lipson
Summary: Low propagation loss in high confinement waveguides is achieved by shaping the mode using a highly multimode structure to reduce overlap with waveguide interfaces, without the need for sophisticated fabrication processes. Experimental demonstration of microresonators with intrinsic quality factors of 31.8 +/- 4.4 million is provided, showing the generation of a broadband single-soliton frequency comb without higher order modes.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Renato R. Domeneguetti, Yun Zhao, Xingchen Ji, Marcelo Martinelli, Michal Lipson, Alexander L. Gaeta, Paulo Nussenzveig
Summary: A method is proposed to generate widely separated first sidebands using four-wave mixing in optical parametric oscillators on photonic chips. By exploiting higher-order transverse modes and dispersion engineering, single sideband fields covering visible and telecom spectral regions can be produced. The approach demonstrates a change in parametric oscillation dynamics and the ability to tailor spectral positions of signal and idler fields.
Article
Optics
Xingchen Ji, Samantha Roberts, Mateus Corato-Zanarella, Michal Lipson
Summary: This article discusses methods to achieve ultra-high quality factor on-chip resonators on a silicon nitride platform, including microfabrication processes, quality factor measurement, and improvement methods. It also explores the extraction of basic loss limits and a calculation model for scattering losses in waveguides and resonators.
Article
Optics
Guozhen Liang, Heqing Huang, Aseema Mohanty, Min Chul Shin, Xingchen Ji, Michael Joseph Carter, Sajan Shrestha, Michal Lipson, Nanfang Yu
Summary: The study presents visible-spectrum silicon nitride thermo-optic phase modulators based on adiabatic micro-ring resonators, which offer a one-order-of-magnitude reduction in both device footprint and power consumption compared to waveguide phase modulators. These modulators provide 1.6 pi phase modulation with minimal amplitude variations and improved robustness against fabrication variations.
Article
Optics
Yoshitomo Okawachi, Bok Young Kim, Yun Zhao, Xingchen Ji, Michal Lipson, Alexander L. Gaeta
Summary: This study demonstrates dynamic control of photon lifetime using a silicon-nitride coupled-ring resonator, allowing for fast switch operations and on-chip true random number generation. It overcomes the Q-limited generation rate of DOPO and offers a new path for developing high-quality entropy sources.
Article
Optics
Yoshitomo Okawachi, Bok Young Kim, Yun Zhao, Jae K. Jang, Xingchen Ji, Michal Lipson, Alexander L. Gaeta
Summary: Kerr soliton combs operate in the anomalous group-velocity dispersion regime and can be actively tuned for spectral shaping of the soliton spectrum. Active tuning of dispersive-wave (DW) wavelength is demonstrated through wavelength-controllable avoided mode crossing, allowing for post-fabrication control of the comb lines' power and position.
Article
Materials Science, Multidisciplinary
Samantha Roberts, Xingchen Ji, Jaime Cardenas, Mateus Corato-Zanarella, Michal Lipson
Summary: A method using atomic force microscopy to measure waveguide sidewall roughness and a new bending model for predicting device performance are developed in this study, which are of great importance for optimizing fabrication of state-of-the-art photonic devices.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Anthony Rizzo, Stuart Daudlin, Asher Novick, Aneek James, Vignesh Gopal, Vaishnavi Murthy, Qixiang Cheng, Bok Young Kim, Xingchen Ji, Yoshitomo Okawachi, Matthew van Niekerk, Venkatesh Deenadayalan, Gerald Leake, Michael Fanto, Stefan Preble, Michal Lipson, Alexander Gaeta, Keren Bergman
Summary: Silicon photonics has great potential in improving optical interconnects in data centers and high performance computers, enabling higher transmission rates and lower energy consumption. This study reviews recent progress in silicon photonic interconnects, with a focus on chip-scale Kerr frequency comb sources, and provides a comprehensive overview of scalable silicon photonic systems. Experimental results demonstrate the feasibility of volume manufacturing for this technology.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Optics
Xingchen Ji, Yoshitomo Okawachi, Andres Gil-Molina, Mateus Corato-Zanarella, Samantha Roberts, Alexander L. Gaeta, Michal Lipson
Summary: The fabrication processes of silicon nitride (Si3N4) photonic devices used in foundries require low temperature deposition, which leads to high propagation losses. However, by reducing waveguide surface roughness, propagation loss as low as 0.42 dB cm(-1) can be achieved using foundry compatible processes. Postprocessing the devices using rapid thermal anneal (RTA) and furnace anneal further reduces the losses to 0.28 dB cm(-1) and 0.06 dB cm(-1), respectively. These low losses are comparable to conventional devices using high temperature LPCVD films and demonstrate the feasibility of scalable photonic systems based on foundries.
LASER & PHOTONICS REVIEWS
(2023)
Article
Optics
Mateus Corato-Zanarella, Andres Gil-Molina, Xingchen Ji, Min Chul Shin, Aseema Mohanty, Michal Lipson
Summary: We demonstrate a chip-scale visible laser platform that achieves tunable and narrow-linewidth lasers from near-ultraviolet to near-infrared wavelengths. Our lasers have achieved specifications previously only possible with large benchtop laser systems, making them a powerful tool for the next generation of visible-light technologies.
Article
Nanoscience & Nanotechnology
Yikai Su, Yu He, Xuhan Guo, Weiqiang Xie, Xingchen Ji, Hongwei Wang, Xinlun Cai, Limin Tong, Siyuan Yu
Summary: To meet the increasing demand for bandwidth, photonic integrated circuits (PICs) have been widely used in applications requiring high capacity and high-bandwidth density interconnects. However, scaling PICs to meet future petabit per second capacity requirements poses challenges. This study examines the scalability bottlenecks of PICs including guiding materials, dense integration approaches, wide-band optical sources, and high efficiency tunable and modulation devices. Potential solutions to address these challenges are explored. Future PIC development will require significant innovations and technological breakthroughs, as the Moore's law for integrated photonics may have a shorter lifespan compared to that in the microelectronics industry.
Article
Optics
Yun Zhao, Jae K. Jang, Xingchen Ji, Yoshitomo Okawachi, Michal Lipson, Alexander L. Gaeta
Summary: Chip-based optical amplifiers, specifically microresonator-assisted regenerative optical parametric amplifiers (OPAs), offer engineerable gain spectra and compact footprint. This study demonstrates a high-gain microresonator-assisted regenerative OPA, achieving 30-dB parametric gain with only 9 mW of continuous-wave (cw) pump power. The gain spectrum can be engineered to cover telecom channels inaccessible with traditional amplifiers. The flexible gain-spectrum engineering and low power requirements of this OPA make it well-suited for on-chip optical and microwave frequency synthesis applications.
Article
Optics
Anthony Rizzo, Asher Novick, Vignesh Gopal, Bok Young Kim, Xingchen Ji, Stuart Daudlin, Yoshitomo Okawachi, Qixiang Cheng, Michal Lipson, Alexander L. Gaeta, Keren Bergman
Summary: Researchers have designed and demonstrated a scalable and compact chip-based link architecture that could enable terabit-scale optical interconnects for hyperscale data centres. By using light and wavelength-division multiplexing with chip-based microresonator Kerr frequency combs, independent information channels can be encoded onto multiple colors of light for parallel data transmission with low energy consumption. They have developed a chip-based silicon photonic data link that can transmit data at 512 Gb/s across 32 independent wavelength channels, with the potential for scaling to hundreds of wavelength channels.
Proceedings Paper
Engineering, Electrical & Electronic
Xingchen Ji, Michal Lipson
Summary: Si3N4 has gained significant interest due to its extensive applications in biophotonics, telecommunications, nonlinear optics, and sensing. This article focuses on exploiting ultra-low loss Si3N4 for on-chip delay line and frequency comb generation.
2022 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION (OFC)
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Xingchen Ji, Diana Mojahed, Yoshitomo Okawachi, Alexander L. Gaeta, Christine P. Hendon, Michal Lipson
Summary: A supercontinuum light source for OCT imaging was demonstrated on a compact 1 mm(2) Si3N4 chip, achieving high sensitivity and low sensitivity roll-off at a specific distance with minimal incident power.
2021 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2021)
