Explanipedia

Scattering Induced Mode Chirality in Ring Resonators Open

Haochen Yan, Xu Guo, Arghadeep Pal, Xiaoyuan Huang, Alekhya Ghosh , et al. · 2025

Non-Hermitian physics can be used to break time reversal symmetry and is important for interactions in a wide range of systems, from active matter and neural networks to metamaterials and non-equilibrium thermodynamics. In integrated photo…

Phase Symmetry Breaking of Counterpropagating Light in Microresonators for Switches and Logic Gates Open

Alekhya Ghosh, Arghadeep Pal, Shuangyou Zhang, Lewis Hill, Toby Bi , et al. · 2025

The rapidly growing field of integrated photonics is enabling a large number of novel devices for optical data processing, neuromorphic computing and circuits for quantum photonics. While many photonic devices are based on linear optics, n…

Turnkey soliton frequency combs from a linear fiber cavity with microresonator mirror Open

Hao Zhang, Shuangyou Zhang, Toby Bi, Yaojing Zhang, Haochen Yan , et al. · 2025

We demonstrate robust turnkey soliton frequency combs using a fiber Fabry-Pérot cavity laser. This believed to be novel linear fiber-laser-based approach leverages Rayleigh scattering from a microresonator to serve as a partial reflector t…

Visualization of nonlinear optics in a microresonator Open

Hao F. Zhang, Haochen Yan, Alekhya Ghosh, Shuangyou Zhang, Toby Bi , et al. · 2025

A precise understanding of nonlinear optical phenomena in whispering gallery mode (WGM) microresonators is crucial for developing next-generation integrated photonic devices. Applications include on-chip sensors for biomedical use, optical…

Microresonator soliton frequency combs via cascaded Brillouin scattering Open

Hao Zhang, Shuangyou Zhang, Toby Bi, George N. Ghalanos, Yaojing Zhang , et al. · 2025

Microresonator frequency combs are vital for advancing optical communications and sensing, but current methods face challenges in achieving low phase noise and flexible repetition rates simultaneously. Here, we demonstrate forward-propagat…

Inverse-Designed Silicon Nitride Nanophotonics Open

Toby Bi, Shuangyou Zhang, Egemen Bostan, Danxian Liu, Aditya S. Paul , et al. · 2025

Silicon nitride photonics has enabled integration of a variety of components for applications in linear and nonlinear optics, including telecommunications, optical clocks, astrocombs, bio-sensing, and LiDAR. With the advent of inverse desi…

Hybrid Nonlinear Effects in Photonic Integrated Circuits Open

Arghadeep Pal, Alekhya Ghosh, Shuangyou Zhang, Toby Bi, Masoud Kheyri , et al. · 2025

Nonlinear optics in photonic integrated circuits is usually limited to utilizing the nonlinearity of a single material. In this work, we demonstrate the use of hybrid optical nonlinearities that occur in two different materials. This appro…

Femtosecond pulse amplification on a chip Open

Mahmoud Gaafar, Markus Ludwig, Kai Wang, Thibault Wildi, Thibault Voumard , et al. · 2024

On-the-fly precision spectroscopy with a dual-modulated tunable diode laser and Hz-level referencing to a cavity Open

Shuangyou Zhang, Toby Bi, Pascal Del’Haye · 2024

Advances in laser spectroscopy have enabled many scientific breakthroughs in physics, chemistry, biology, and astronomy. Optical frequency combs pushed measurement limits with ultrahigh-frequency accuracy and fast-measurement speed, while …

Phase Symmetry Breaking of Counterpropagating Light in Microresonators for Switches and Logic Gates Open

Alekhya Ghosh, Arghadeep Pal, Shuangyou Zhang, Lewis Hill, Toby Bi , et al. · 2024

The rapidly growing field of integrated photonics is enabling a large number of novel devices for optical data processing, neuromorphic computing and circuits for quantum photonics. While many photonic devices are based on linear optics, n…

Linear and Nonlinear Coupling of Light in Twin-Resonators with Kerr Nonlinearity Open

Arghadeep Pal, Alekhya Ghosh, Shuangyou Zhang, Lewis Hill, Haochen Yan , et al. · 2024

Nonlinear effects in microresonators are efficient building blocks for all-optical computing and telecom systems. With the latest advances in microfabrication, coupled microresonators are used in a rapidly growing number of applications. I…

Symmetry broken vectorial Kerr frequency combs from Fabry-Pérot resonators Open

Lewis Hill, Eva-Maria Hirmer, Graeme Campbell, Toby Bi, Alekhya Ghosh , et al. · 2024

Spontaneous symmetry breaking of a pair of vector temporal cavity solitons has been established as a paradigm to modulate optical frequency combs, and finds many applications in metrology, frequency standards, communications, and photonic …

Real-time imaging of standing-wave patterns in microresonators Open

Haochen Yan, Alekhya Ghosh, Arghadeep Pal, Hao Zhang, Toby Bi , et al. · 2024

Real-time characterization of microresonator dynamics is important for many applications. In particular, it is critical for near-field sensing and understanding light–matter interactions. Here, we report camera-facilitated imaging and anal…

Controlled light distribution with coupled microresonator chains via Kerr symmetry breaking Open

Alekhya Ghosh, Arghadeep Pal, Lewis Hill, Graeme N. Campbell, Toby Bi , et al. · 2024

Within optical microresonators, the Kerr interaction of photons can lead to symmetry breaking of optical modes. In a ring resonator, this leads to the interesting effect that light preferably circulates in one direction or in one polarizat…

Real-time imaging of standing-wave patterns in microresonators Open

Haochen Yan, Alekhya Ghosh, Arghadeep Pal, Hao Zhang, Toby Bi , et al. · 2024

Real-time characterization of microresonator dynamics is important for many applications. In particular it is critical for near-field sensing and understanding light-matter interactions. Here, we report camera-facilitated imaging and analy…

Low‐Temperature Sputtered Ultralow‐Loss Silicon Nitride for Hybrid Photonic Integration Open

Shuangyou Zhang, Toby Bi, Irina Harder, Olga Ohletz, Florentina Gannott , et al. · 2023

Silicon‐nitride‐on‐insulator (Si 3 N 4 ) photonic circuits have seen tremendous advances in many applications, such as on‐chip frequency combs, Lidar, telecommunications, and spectroscopy. So far, the best film quality has been achieved wi…

Microresonator soliton frequency combs via cascaded Brillouin scattering Open

Hao Zhang, Shuangyou Zhang, Toby Bi, George N. Ghalanos, Yaojing Zhang , et al. · 2023

We demonstrate Kerr soliton frequency comb generation that is seeded by a cascaded Brillouin scattering process. In this process, a pump laser is used to generate multiple orders of Brillouin sidebands in a microresonator, which in turn ge…

Geometry optimization for dark soliton combs in thin multimode silicon nitride microresonators Open

Yaojing Zhang, Shuangyou Zhang, Toby Bi, Pascal Del’Haye · 2023

Silicon nitride (Si 3 N 4 ) has been well established as an ultralow-loss material for integrated photonics, particularly for the generation of dissipative Kerr soliton frequency combs, enabling various applications for optical metrology, …

Quintic Dispersion Soliton Frequency Combs in a Microresonator (Laser Photonics Rev. 17(10)/2023) Open

Shuangyou Zhang, Toby Bi, Pascal Del’Haye · 2023

Quintic Dispersion Soliton Frequency Combs in a Microresonator In article number 2300075, Shuangyou Zhang, Toby Bi, and Pascal Del'Haye demonstrate the first observation of multi-peak soliton structures (“soliton molecules”) enabled by fif…

Symmetry Broken Vectorial Kerr Frequency Combs from Fabry-Pérot Resonators Open

Lewis Hill, Eva-Maria Hirmer, Graeme Campbell, Toby Bi, Alekhya Ghosh , et al. · 2023

Optical frequency combs find many applications in metrology, frequency standards, communications and photonic devices. We consider field polarization properties and describe a vector comb generation through the spontaneous symmetry breakin…

Symmetry Broken Vectorial Kerr Frequency Combs from Fabry-Pérot Resonators Open

Lewis Hill, Eva-Maria Hirmer, Graeme Campbell, Toby Bi, Alekhya Ghosh , et al. · 2023

Optical frequency combs find many applications in metrology, frequency standards, communications and photonic devices. We consider field polarization properties and describe a vector comb generation through the spontaneous symmetry breakin…

Quintic Dispersion Soliton Frequency Combs in a Microresonator Open

Shuangyou Zhang, Toby Bi, Pascal Del’Haye · 2023

Chip‐scale optical frequency combs have attracted significant research interest and can be used in applications ranging from precision spectroscopy to telecom channel generators and lidar systems. In the time domain, microresonator based f…

Silica micro-rod resonator-based Kerr frequency comb for high-speed short-reach optical interconnects Open

Rihards Mūrnieks, Toms Salgals, Jānis Alnis, Armands Ostrovskis, Oskars Ozoliņš , et al. · 2023

Conventional data center interconnects rely on power-hungry arrays of discrete wavelength laser sources. However, growing bandwidth demand severely challenges ensuring the power and spectral efficiency toward which data center interconnect…

On-the-fly precision spectroscopy with a dual-modulated tunable diode laser and Hz-level referencing to a cavity Open

Shuangyou Zhang, Toby Bi, Pascal Del’Haye · 2023

Advances in high-resolution laser spectroscopy have enabled many scientific breakthroughs in physics, chemistry, biology and astronomy. Optical frequency combs have pushed measurement limits with ultrahigh-frequency accuracy and fast-measu…

Machine learning assisted inverse design of microresonators Open

Arghadeep Pal, Alekhya Ghosh, Shuangyou Zhang, Toby Bi, Pascal Del’Haye · 2023

The high demand for fabricating microresonators with desired optical properties has led to various techniques to optimize geometries, mode structures, nonlinearities, and dispersion. Depending on applications, the dispersion in such resona…

Room-Temperature Sputtered Ultralow-loss Silicon Nitride for Hybrid Photonic Integration Open

Shuangyou Zhang, Toby Bi, Irina Harder, Olga Lohse, Florentina Gannott , et al. · 2023

Silicon-nitride-on-insulator photonic circuits have seen tremendous advances in many applications, such as on-chip frequency combs, Lidar, telecommunications, and spectroscopy. So far, the best film quality has been achieved with low press…

Femtosecond pulse amplification on a chip Open

Mahmoud Gaafar, Markus Ludwig, Kai Wang, Thibault Wildi, Thibault Voumard , et al. · 2023

Femtosecond laser pulses enable the synthesis of light across the electromagnetic spectrum and provide access to ultrafast phenomena in physics, biology, and chemistry. Chip-integration of femtosecond technology could revolutionize applica…

"Talking" Vector Solitons and their Polarization Conformity in Fabry-Pérot Cavities Open

Lewis Hill, Eva-Maria Hirmer, Graeme Campbell, Toby Bi, Alekhya Ghosh , et al. · 2023

Optical frequency combs are applicable across many fields, especially in metrology. Through accounting for field polarization, the spontaneous symmetry breaking of vector temporal cavity solitons and combs in Kerr Fabry–Perot resonators is…

Machine Learning Assisted Inverse Design of Microresonators Open

Arghadeep Pal, Alekhya Ghosh, Shuangyou Zhang, Toby Bi, Pascal DeľHaye · 2022

The high demand for fabricating microresonators with desired optical properties has led to various techniques to optimize geometries, mode structures, nonlinearities and dispersion. Depending on applications, the dispersion in such resonat…

Microresonator Soliton Frequency Combs in the Zero-Dispersion Regime Open

Shuangyou Zhang, Toby Bi, Pascal Del’Haye · 2022

Chip-scale optical frequency combs have attracted significant research interest and can be used in applications ranging from precision spectroscopy to telecom channel generators and lidar systems. In the time domain, microresonator based f…

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