Publications (52)
Quantum Metamorphosis: Programmable Emergence and the Breakdown of Bulk-Edge Dichotomy in Multiscale Systems
Mahmoud Jalali Mehrabad, Alireza Parhizkar, Lida Xu +6
Multiscale synergy -- the interplay of a system's distinct characteristic length, time, and energy scales -- is becoming a unifying thread across many contemporary branches of scie…
Highly squeezed nanophotonic quantum microcombs with broadband frequency tunability
Yichen Shen, Ping-Yen Hsieh, Dhruv Srinivasan +8
Squeezed light offers genuine quantum advantage in enhanced sensing and quantum computation; yet the level of squeezing or quantum noise reduction generated from nanophotonic chips…
All-Optical Noise Quenching of An Integrated Frequency Comb
Gregory Moille, Pradyoth Shandilya, Jordan Stone +2
Integrated frequency combs promise transformation of lab-based metrology into disruptive real-world applications. These microcombs are, however, sensitive to stochastic thermal flu…
Towards Faster InP Photonic Crystal All-Optical-Gates
Gregory Moille, Sylvain Combrié, Kerstin Fuchs +3
We demonstrated a two-fold acceleration of the fast time constant characterising the recovery of a P-doped Indium-Phosphide Photonic Crystal all-optical gate. Time-resolved spectra…
Broadband Chromatic Dispersion of Thermo-refractive Coefficients and its Impact in Silicon Nitride Nonlinear Photonics
Shao-Chien Ou, Gregory Moille, Kartik Srinivasan
The thermo-refractive effect is a cornerstone of frequency and phase tuning in photonic integrated circuits. In particular, it enables control of phase-matching for integrated nonl…
Impact of Stoichiometric Silicon Nitride Growth Conditions on Dispersion Engineering of Broadband Microresonator Frequency Combs
Gregory Moille, Daron Westly, Gregory Simelgor +1
Microresonator frequency combs, or microcombs, have gained wide appeal for their rich nonlinear physics and wide range of applications. Stoichiometric silicon nitride films grown v…
Two-Dimensional Nonlinear Mixing Between a Dissipative Kerr Soliton and Continuous Waves for a Higher-Dimension Frequency Comb
Gregory Moille, Christy Li, Jordan Stone +6
Dissipative Kerr solitons (DKSs) intrinsically exhibit two degrees of freedom through their group and phase rotation velocity. Periodic extraction of the DKS into a waveguide produ…
Hybrid-mode-family Kerr optical parametric oscillation for robust coherent light generation on chip
Feng Zhou, Xiyuan Lu, Ashutosh Rao +5
Optical parametric oscillation (OPO) using the third-order nonlinearity () in integrated photonics platforms is an emerging approach for coherent light generation, and ha…
Efficient chip-based optical parametric oscillators from 590 nm to 1150 nm
Jordan R. Stone, Xiyuan Lu, Gregory Moille +1
Optical parametric oscillators are widely used to generate coherent light at frequencies not accessible by conventional laser gain. However, chip-based parametric oscillators opera…
A universal frequency engineering tool for microcavity nonlinear optics: multiple selective mode splitting of whispering-gallery resonances
Xiyuan Lu, Ashutosh Rao, Gregory Moille +2
Whispering-gallery microcavities have been used to realize a variety of efficient parametric nonlinear optical processes through the enhanced light-matter interaction brought about…
Tailoring Broadband Kerr Soliton Microcombs via Post-Fabrication Tuning of the Geometric Dispersion
Gregory Moille, Daron Westly, Ndubuisi George Orji +1
Geometric dispersion in integrated microresonators plays a major role in nonlinear optics applications, especially at short wavelengths, to compensate the natural material normal d…
Conversion efficiency in Kerr microresonator optical parametric oscillators: From three modes to many modes
Jordan R. Stone, Gregory Moille, Xiyuan Lu +1
We study optical parametric oscillations in Kerr-nonlinear microresonators, revealing an intricate solution space -- parameterized by the pump-to-signal conversion efficiency -- th…
Efficient telecom-to-visible spectral translation through ultra-low power nonlinear nanophotonics
Xiyuan Lu, Gregory Moille, Qing Li +7
The ability to spectrally translate lightwave signals in a compact, low-power platform is at the heart of the promise of nonlinear nanophotonic technologies. For example, a device…
Integrated photonic interposers for processing octave-spanning microresonator frequency combs
Ashutosh Rao, Gregory Moille, Xiyuan Lu +7
Microcombs - optical frequency combs generated in microresonators - have advanced tremendously in the last decade, and are advantageous for applications in frequency metrology, nav…
Phased-Locked Two-Color Single Soliton Microcombs in Dispersion-Engineered Si3N4 Resonators
Gregory Moille, Qing Li, Sangsik Kim +2
We propose and theoretically investigate a dispersion-engineered Si3N4 microring resonator, based on a cross-section containing a partially-etched trench, that supports phase-locke…
Observation of topological frequency combs
Christopher J. Flower, Mahmoud Jalali Mehrabad, Lida Xu +8
On-chip generation of optical frequency combs using nonlinear ring resonators has opened the route to numerous novel applications of combs that were otherwise limited to mode-locke…
Fourier synthesis dispersion engineering of photonic crystal microrings for broadband frequency combs
Gregory Moille, Xiyuan Lu, Jordan Stone +2
Dispersion engineering of microring resonators is crucial for optical frequency comb applications, to achieve targeted bandwidths and powers of individual comb teeth. However, conv…
All-optical Synchronization of Breather Solitons in a Kerr Microresonator
Wang Liao, Stuart G. Murdoch, Stephane Coen +3
Microresonator Kerr solitons are promising candidates for the realization of miniaturized on-chip optical frequency combs. For specific system parameters, these solitons are associ…
High-performance microresonator optical parametric oscillator on a silicon chip
Edgar F. Perez, Gregory Moille, Xiyuan Lu +3
Optical parametric oscillation (OPO) is distinguished by its wavelength access, that is, the ability to flexibly generate coherent light at wavelengths that are dramatically differ…
Proposal for noise-free visible-telecom quantum frequency conversion through third-order sum and difference frequency generation
Xiyuan Lu, Gregory Moille, Ashutosh Rao +1
Quantum frequency conversion (QFC) between the visible and telecom is a key functionality to connect quantum memories over long distances in fiber-based quantum networks. Current Q…
Integrated Buried Heaters for Efficient Spectral Control of Air-Clad Microresonator Frequency Combs
Gregory Moille, Daron Westly, Edgar F. Perez +3
Integrated heaters are a basic ingredient within the photonics toolbox, in particular for microresonator frequency tuning through the thermo-refractive effect. Resonators that are…
Toward Chaotic Group Velocity Hopping of an On-Chip Dissipative Kerr Soliton
Gregory Moille, Sashank Kaushik Sridhar, Pradyoth Shandilya +3
Chaos enables randomness-based applications, particularly in photonic systems. Integrated optical frequency combs (microcombs) have previously been observed in either chaotic modul…
Kerr Microresonator Soliton Frequency Combs at Cryogenic Temperatures
Gregory Moille, Xiyuan Lu, Ashutosh Rao +6
We present measurements of silicon nitride nonlinear microresonators and frequency comb generation at cryogenic temperatures as low as 7~K. The resulting two orders of magnitude re…
Terahertz Voltage-controlled Oscillator from a Kerr-Induced Synchronized Soliton Microcomb
Usman A. Javid, Michal Chojnacky, Kartik Srinivasan +1
The generation of controlled and arbitrarily tunable terahertz radiation, essential for many applications, has proven challenging due to the complexity of experimental setups and f…
Multi-timescale frequency-phase matching for high-yield nonlinear photonics
Mahmoud Jalali Mehrabad, Lida Xu, Gregory Moille +9
Integrated nonlinear photonic technologies, even with state-of-the-art fabrication with only a few nanometer geometry variations, face significant challenges in achieving wafer-sca…
Chip-integrated visible-telecom photon pair sources for quantum communication
Xiyuan Lu, Qing Li, Daron A. Westly +4
Photon pair sources are fundamental building blocks for quantum entanglement and quantum communication. Recent studies in silicon photonics have documented promising characteristic…
Compact High-Q Optical Comb based on a Photonic Harmonic Potential
Sylvain Combrié, Gaëlle Lehoucq, Gregory Moille +2
An effective harmonic potential for photons is achieved in a photonic crystal structure, owing to the balance of the background dispersion and a bichromatic potential. Consequently…
Topological Frequency Combs and Nested Temporal Solitons
Sunil Mittal, Gregory Moille, Kartik Srinivasan +2
Recent advances in realizing optical frequency combs using nonlinear parametric processes in integrated photonic resonators have revolutionized on-chip optical clocks, spectroscopy…
On-chip multi-timescale spatiotemporal optical synchronization
Lida Xu, Mahmoud Jalali Mehrabad, Christopher J. Flower +7
Mode-locking mechanisms are key resources in nonlinear optical phenomena, such as micro-ring solitonic states, and have transformed metrology, precision spectroscopy, and optical c…
Hybrid InP and SiN integration of an octave-spanning frequency comb
Travis C. Briles, Su-Peng Yu, Lin Chang +7
Implementing optical-frequency combs with integrated photonics will enable wider use of precision timing signals.Here, we explore the generation of an octave-span, Kerr-microresona…
Efficient photo-induced second harmonic generation in silicon photonics
Xiyuan Lu, Gregory Moille, Ashutosh Rao +2
Silicon photonics lacks a second-order nonlinear optical response in general because the typical constituent materials are centro-symmetric and lack inversion symmetry, which prohi…
On-Chip Parametric Synchronization of a Dissipative Kerr Soliton Microcomb
Gregory Moille, Pradyoth Shandilya, Miro Erkintalo +2
Synchronization of oscillators is ubiquitous in nature. Often, the synchronized oscillators couple directly, yet in some cases synchronization can arise from their parametric inter…
Microring Resonator Dispersion Metrology with Neural Networks
Ergun Simsek, Shao-Chien Ou, Gregory Moille +1
Precise knowledge of resonator dispersion, from both geometric and material contributions, is essential for reliable high-performance nonlinear integrated photonics devices, such a…
Dissipative Kerr Solitons in a III-V Microresonator
Gregory Moille, Lin Chang, Weiqiang Xie +5
We demonstrate stable microresonator Kerr soliton frequency combs in a III-V platform (AlGaAs on SiO) through quenching of thermorefractive effects by cryogenic cooling to temp…
On-chip optical parametric oscillation into the visible: generating red, orange, yellow, and green from a near-infrared pump
Xiyuan Lu, Gregory Moille, Ashutosh Rao +2
Optical parametric oscillation (OPO) in a microresonator is promising as an efficient and scalable approach to on-chip coherent visible light generation. However, so far only red l…
Broadband Visible Wavelength Microcomb Generation In Silicon Nitride Microrings Through Air-Clad Dispersion Engineering
Gregory Moille, Daron Westly, Rahul Shrestha +2
The development of broadband microresonator frequency combs at visible wavelengths is pivotal for the advancement of compact and fieldable optical atomic clocks and spectroscopy sy…
Versatile Optical Frequency Division with Kerr-induced Synchronization at Tunable Microcomb Synthetic Dispersive Waves
Gregory Moille, Pradyoth Shandilya, Alioune Niang +3
Kerr-induced synchronization (KIS) provides a new key tool for the control and stabilization of the repetition rate of a cavity soliton frequency comb. It enables direct external c…
Kerr-Induced Synchronization of a Cavity Soliton to an Optical Reference
Gregory Moille, Jordan Stone, Michal Chojnacky +4
The phase-coherent frequency division of a stabilized optical reference laser to the microwave domain is made possible by optical frequency combs (OFCs). Fundamentally, OFC-based c…
Ultra-Broadband Kerr Microcomb Through Soliton Spectral Translation
Gregory Moille, Edgar F. Perez, Jordan R. Stone +5
Broad bandwidth and stable microresonator frequency combs are critical for accurate and precise optical frequency measurements in a compact and deployable format. Typically, broad…
Ultra-efficient frequency comb generation in AlGaAs-on-insulator microresonators
Lin Chang, Weiqiang Xie, Haowen Shu +13
Recent advances in nonlinear optics have revolutionized the area of integrated photonics, providing on-chip solutions to a wide range of new applications. Currently, the state of t…
Milliwatt-threshold visible-telecom optical parametric oscillation using silicon nanophotonics
Xiyuan Lu, Gregory Moille, Anshuman Singh +8
The on-chip creation of coherent light at visible wavelengths is crucial to field-level deployment of spectroscopy and metrology systems. Although on-chip lasers have been implemen…
All-Optical Azimuthal Trapping of Dissipative Kerr Multi-Solitons for Relative Noise Suppression
Pradyoth Shandilya, Shao-Chien Ou, Jordan Stone +4
Temporal cavity solitons, or dissipative Kerr solitons (DKS) in integrated microresonators, are essential for deployable metrology technologies. Such applications favor the lowest…
On-chip Kerr parametric oscillation with integrated heating for enhanced frequency tuning and control
Jordan Stone, Daron Westly, Gregory Moille +1
Nonlinear microresonators can convert light from chip-integrated sources into new wavelengths within the visible and near-infrared spectrum. For most applications, such as the inte…
AC-Josephson Effect and Sub-Comb Mode-Locking in a Kerr-Induced Synchronized Cavity Soliton
Gregory Moille, Usman A. Javid, Michal Chojnacky +3
Kerr-induced synchronization (KIS) [1] involves the capture of a dissipative Kerr soliton (DKS) microcomb [2] tooth by a reference laser injected into the DKS resonator. This phase…
Wavelength-Accurate Nonlinear Conversion through Wavenumber Selectivity in Photonic Crystal Resonators
Jordan R. Stone, Xiyuan Lu, Gregory Moille +3
Integrated nonlinear wavelength converters transfer optical energy from lasers or quantum emitters to other useful colors, but chromatic dispersion limits the range of achievable w…
Synthetic Frequency Lattices from an Integrated Dispersive Multi-Color Soliton
Gregory Moille, Curtis Menyuk, Yanne K. Chembo +2
Dissipative Kerr solitons (DKSs) in optical microresonators have been intensely studied from the perspective of both fundamental nonlinear physics and portable and low power techno…
Single-Shot Realization of 10000-Mode Octave-Spanning Artificial Gauge Fields
Lida Xu, Apurva Padhye, Supratik Sarkar +6
Artificial gauge fields (AGFs) enable photons and other bosons to emulate fermionic phenomena such as chiral edge transport and quantum Hall phases; however, existing theories and…
High-performance and power-efficient 22 optical switch on Silicon-on-Insulator
Zheng Han, Gregory Moille, Xavier Checoury +4
A compact (15μmμm) and highly-optimized 22 optical switch is demonstrated on a CMOS-compatible photonic crystal technology. On-chip insertion loss are below 1…
pyLLE: a Fast and User Friendly Lugiato-Lefever Equation Solver
Gregory Moille, Qing Li, Xiyuan Lu +1
We present the development of pyLLE, a freely accessible and cross-platform Lugiato-Lefever equation solver programmed in Python and Julia and optimized for the simulation of micro…
300 mm Wafer-Scale SiN Platform for Broadband Soliton Microcombs Compatible with Alkali Atomic References
Shao-Chien Ou, Alin Antohe, Lewis G. Carpenter +2
Chip-integrated optical frequency combs (OFCs) based on Kerr nonlinear resonators are of great significance given their scalability and wide range of applications. Broadband on-chi…
Broadband Resonator-Waveguide Coupling for Efficient Extraction of Octave Spanning Microcombs
Gregory Moille, Qing Li, Travis C. Briles +7
Frequency combs spanning over an octave have been successfully demonstrated in Kerr nonlinear microresonators on-chip. These micro-combs rely on both engineered dispersion, to enab…
100GHz Integrated All-Optical Switch Enabled by ALD
Gregory Moille, Sylvain Combrié, Laurence Morgenroth +5
The carrier lifetime of a photonic crystal all-optical switch is optimized by controlling the surface of GaAs by Atomic Layer Deposition. We demonstrate an all optical modulation c…