Explanipedia

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…

Polarization Faticons: Chiral Localized Structures in Self-Defocusing Kerr Resonators Open

NULL AUTHOR_ID, Gang Xu, Pengxiang Wang, Gian‐Luca Oppo, Lewis Webb Hill , et al. · 2025

We report on numerical predictions and experimental observations of a novel type of temporal localized dissipative structures that manifest themselves in the self-defocusing regime of driven nonlinear optical resonators with two polarizati…

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…

Exceptional, but Separate: Precursors to Spontaneous Symmetry Breaking Open

Lewis Hill, Julius Gohsrich, Alekhya Ghosh, Jacob Fauman, Pascal Del’Haye , et al. · 2025

Spontaneous symmetry breaking (SSB) and exceptional points (EPs) are often assumed to be inherently linked. Here we investigate the intricate relationship between SSB and specific classes of EPs across three distinct, real-world scenarios …

Exceptional, but Separate: Precursors to Spontaneous Symmetry Breaking Open

Lewis Hill, Julius T. Gohsrich, Alekhya Ghosh, Jacob Fauman, Pascal Del’Haye , et al. · 2025

Spontaneous symmetry breaking (SSB) and exceptional points (EPs) are often assumed to be inherently linked. Here we investigate the intricate relationship between SSB and specific classes of EPs across three distinct, real-world scenarios …

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…

Polarization faticons: Chiral localized structures in self-defocusing Kerr resonators Open

Erwan Lucas, Gang Xu, Pengxiang Wang, Gian‐Luca Oppo, Lewis Webb Hill , et al. · 2024

We report on numerical predictions and experimental observations of a novel type of temporal localized dissipative structures that manifest themselves in the self-defocusing regime of driven nonlinear optical resonators with two polarizati…

Near‐Infrared Dual‐Band Frequency Comb Generation from a Silicon Resonator Open

Keyi Zhong, Yaojing Zhang, Shuangyou Zhang, Yuanfei Zhang, Yuan Li , et al. · 2024

Benefitting from the mature, cost‐effective, and scalable manufacturing capabilities of complementary metal‐oxide‐semiconductor (CMOS) technology, silicon photonics has facilitated the seamless and monolithic integration of diverse functio…

Femtosecond pulse amplification on a chip Open

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

Frequency comb enhancement via the self-crystallization of vectorial cavity solitons Open

Graeme N. Campbell, Lewis Hill, Pascal Del’Haye, Gian‐Luca Oppo · 2024

Long-range interactions between dark vectorial temporal cavity solitons are induced by the formation of patterns via spontaneous symmetry breaking of orthogonally polarized fields in ring resonators. Turing patterns of alternating polariza…

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…

Frequency Comb Enhancement via the Self-Crystallization of Vectorial Cavity Solitons Open

Graeme N. Campbell, Lewis Hill, Pascal Del’Haye, Gian‐Luca Oppo · 2024

Long range interactions between dark vectorial temporal cavity solitons are induced though the spontaneous symmetry breaking of orthogonally polarized fields in ring resonators. Turing patterns of alternating polarizations form between adj…

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…

Topological Features of Bright Vector Solitons in Ring Resonators with Normal Dispersion Open

Erwan Lucas, Lewis Hill, Gang Xu, Gian‐Luca Oppo, Yiqing Xu , et al. · 2024

Experiments and simulations of unusual bright vector solitons in Kerr ring resonators with normal dispersion displaying a phase defect with a phase jump of π in one of the linear polarization components are presented.

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…

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, …

Four-field symmetry breakings in twin-resonator photonic isomers Open

Alekhya Ghosh, Lewis Hill, Gian‐Luca Oppo, Pascal Del’Haye · 2023

Symmetry and symmetry breaking of light states play an important role in photonic integrated circuits and have recently attracted lots of research interest that is relevant to the manipulation of light polarization, telecommunications, all…

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…

Dark solitons in Fabry-Pérot resonators with Kerr media and normal dispersion Open

Graeme N. Campbell, Lewis Hill, Pascal Del’Haye, Gian‐Luca Oppo · 2023

The ranges of existence and stability of dark cavity-soliton stationary states in a Fabry-P\'erot resonator with a Kerr nonlinear medium and normal dispersion are determined. The Fabry-P\'erot configuration introduces nonlocal coupling tha…

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…

Multi-stage spontaneous symmetry breaking of light in Kerr ring resonators Open

Lewis Hill, Gian‐Luca Oppo, Pascal Del’Haye · 2023

Symmetry breaking of light states is of interest for the understanding of nonlinear optics, photonic circuits, telecom applications and optical pulse generation. Here we demonstrate multi-stage symmetry breaking of the resonances of ring r…

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…

Dark solitons in Fabry-Perot resonators with Kerr media and normal dispersion Open

Graeme N. Campbell, Lewis Webb Hill, Pascal Del’Haye, Gian‐Luca Oppo · 2023

Ranges of existence and stability of dark cavity-soliton stationary states in a Fabry-Perot resonator with a Kerr nonlinear medium and normal dispersion are determined. The Fabry-Perot configuration introduces nonlocal coupling that shifts…

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…

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