A5044669548- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Advanced Photonic Communication Systems
- Laser-Matter Interactions and Applications
- Cancer Treatment and Pharmacology
- Advanced Fiber Optic Sensors
- Quantum Information and Cryptography
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Photonic Crystal and Fiber Optics
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fluorescence Microscopy Techniques
- Photonic Crystals and Applications
- Quantum optics and atomic interactions
- Advanced MEMS and NEMS Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Near-Field Optical Microscopy
- Silicon Nanostructures and Photoluminescence
- Polymer Foaming and Composites
- Glioma Diagnosis and Treatment
- RFID technology advancements
- Medical Education and Admissions
- Advanced Frequency and Time Standards
- Semantic Web and Ontologies
École Polytechnique Fédérale de Lausanne
2018-2024
University of Edinburgh
2023
Alagappa University
2013
Low-loss photonic integrated circuits (PIC) and microresonators have enabled novel applications ranging from narrow-linewidth lasers, microwave photonics, to chip-scale optical frequency combs quantum conversion. To translate these results into a widespread technology, attaining ultralow losses with established foundry manufacturing is critical. Recent advances in fabrication of Si3N4 photonics shown that ultralow-loss, dispersion-engineered can be attained at die-level throughput. For...
On-chip optical waveguides with low propagation losses and precisely engineered group velocity dispersion (GVD) are important to nonlinear photonic devices such as soliton microcombs. Yet, despite intensive research efforts, integrated platforms still feature orders of magnitude higher than in standard fiber. The tight confinement high index contrast make them highly susceptible fabrication induced surface roughness. Therefore, microresonators ultra-high Q factors are, date, only attainable...
The generation of dissipative Kerr solitons in optical microresonators has provided a route to compact frequency combs high repetition rate, which have already been employed for synthesizers, ultrafast ranging, coherent telecommunication and dual-comb spectroscopy. Silicon nitride (Si$_3$N$_4$) are promising photonic integrated soliton microcombs. Yet date, formation Si$_3$N$_4$ at electronically detectable rates, typically less than 100 GHz, is hindered by the requirement external power...
Microcombs provide a path to broad-bandwidth integrated frequency combs with low power consumption, which are compatible wafer-scale fabrication. Yet, electrically-driven, photonic chip-based microcombs inhibited by the required high threshold and agility of laser for soliton initiation. Here we demonstrate an electrically-driven microcomb coupling III-V-material-based (indium phosphide) multiple-longitudinal-mode diode chip high-Q silicon nitride microresonator fabricated using Damascene...
Abstract Integrated photonics facilitates extensive control over fundamental light–matter interactions in manifold quantum systems including atoms 1 , trapped ions 2,3 dots 4 and defect centres 5 . Ultrafast electron microscopy has recently made free-electron beams the subject of laser-based manipulation characterization 6–11 enabling observation walks 12–14 attosecond pulses 10,15–17 holographic electromagnetic imaging 18 Chip-based 19,20 promises unique applications nanoscale sensing but...
Advancing quantum information, communication and sensing relies on the generation control of correlations in complementary degrees freedom. Here, we demonstrate preparation electron-photon pair states using phase-matched interaction free electrons with evanescent vacuum field a photonic-chip-based optical microresonator. Spontaneous inelastic scattering produces intracavity photons coincident energy-shifted electrons. Harnessing these pairs for correlation-enhanced imaging, achieve...
Thermodynamic noise places a fundamental limit on the frequency stability of dielectric optical resonators. Here, we present characterization thermo-refractive in photonic-chip-based silicon nitride microresonators and show that is dominant thermal source platform. We employed balanced homodyne detection to measure spectrum different diameters. The measurements are good agreement with theoretical models finite element method simulations. Our sets quantitative bounds scaling absolute...
Silicon nitride (Si_{3}N_{4}) has emerged as a promising material for integrated nonlinear photonics and been used broadband soliton microcombs low-pulse-energy supercontinuum generation. Therefore, understanding all optical properties of Si_{3}N_{4} is important. So far, only stimulated Brillouin scattering (SBS) not yet reported. Here we observe, the first time, backward SBS in fully cladded waveguides. The gain spectrum exhibits an unusual multipeak structure resulting from hybridization...
We demonstrate piezoelectric actuators monolithically integrated on ultralow-loss Si <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> N xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> waveguides. Varying the voltage applied actuator allows microresonator tuning, and to initiate, switch, stabilize tightly phase lock single soliton microcomb. This new capability build a compact soliton-based paralell LiDAR.
The short de Broglie wavelength and strong interaction empower free electrons to probe structures excitations in materials biomolecules. Recently, electron-photon interactions have enabled new optical manipulation schemes for electron beams. In this work, we demonstrate the of with nonlinear states inside a photonic chip–based microresonator. Optical parametric processes give rise spatiotemporal pattern formation corresponding coherent or incoherent frequency combs. We couple such...
Networks inside current data centers comprise a hierarchy of power-hungry electronic packet switches interconnected via optical fibers and transceivers. As the scaling such electrically-switched networks approaches plateau, power-efficient solution is to implement flat network with circuit switching (OCS), without reduced number transceivers due direct links among servers. One promising ways implementing OCS by using tunable lasers arrayed waveguide grating routers. Such an OCS-network can...
For widespread applications of nonlinear photonic integrated circuits, ultralow optical losses and high fabrication throughput are required. Here, we present a CMOS technique for microresonators with mean quality factors exceeding 30 millions wafer-level yield.
Efficient light coupling to integrated photonic devices is of key importance a wide variety applications. "Inverse nanotapers" are widely used, in which the waveguide width reduced match an incident mode. Here, we demonstrate novel "double inverse" tapers, reduce both height and width. We >45% chip-through efficiency for transverse electric magnetic polarizations Si3N4 tapers >500 nm width, comparison regular inverse that necessitate <100 The double show polarization-independent allow...
Integrated photonics represents a technology that could greatly improve quantum communication networks in terms of cost, size, scaling, and robustness.A key benchmark for this is to demonstrate their performance complex networking protocols, such as entanglement swapping between independent photon-pair sources.Here, using time-resolved detection, two integrated Si3N4 microring resonator sources, operating the CW regime at telecom wavelengths, we obtained spectral purities up 0.97 ± 0.02 HOM...
The rapidly maturing integrated Kerr microcombs show significant potential for microwave photonics. Yet, state-of-the-art microcomb based radiofrequency (RF) filters have required programmable pulse shapers, which inevitably increase the system cost, footprint, and complexity. Here, by leveraging smooth spectral envelope of single solitons, we demonstrate first time RF free from any additional shaping. More importantly, achieve all-optical reconfiguration exploiting intrinsically rich...
Monolayer transition-metal dichalcogenides with direct bandgaps are emerging candidates for optoelectronic devices, such as photodetectors, light-emitting diodes, and electro-optic modulators. Here we report a low-loss integrated platform incorporating molybdenum ditelluride monolayers silicon nitride photonic microresonators. We achieve microresonator quality factors >3 × 106 in the telecommunication O- to E-bands. This paves way low-loss, hybrid circuits layered semiconductors, not...
In this paper we improve the quality of free space optics (FSO) communication system. With current needs technology for longer distance, qualitative analysis system has become essential. work, received power level (PR) and bit error rate (BER) are considered to determine fso link performance. The relationship between two parameters investigated analyzed. Then various number TXs RXs experimentally measured compared with theoretical value calculated. work deals calculation simulation designs...
Photonic chip-based soliton microcombs have shown rapid progress and already been used in many system-level applications. There has substantial realizing that rely on compact laser sources, culminating devices only utilize a semiconductor gain chip or self-injection-locked diode as the pump source. However, generating single solitons with electronically detectable repetition rates from module remained challenging. Here we demonstrate current-initiated, Si3N4 chip-based, 99-GHz microcomb...