A5022909078- Photonic and Optical Devices
- Quantum Information and Cryptography
- Advanced Fiber Laser Technologies
- Mechanical and Optical Resonators
- Quantum optics and atomic interactions
- Laser-Matter Interactions and Applications
- Neural Networks and Reservoir Computing
- Random lasers and scattering media
- Quantum Mechanics and Applications
- Terahertz technology and applications
- Optical Network Technologies
- Semiconductor Lasers and Optical Devices
- Spectroscopy and Laser Applications
- Orbital Angular Momentum in Optics
- Quantum Computing Algorithms and Architecture
- Photorefractive and Nonlinear Optics
- Plasmonic and Surface Plasmon Research
- Photonic Crystals and Applications
- Spectroscopy and Quantum Chemical Studies
- Laser Design and Applications
- Advanced Fluorescence Microscopy Techniques
- Atomic and Subatomic Physics Research
- Photonic Crystal and Fiber Optics
- Nonlinear Photonic Systems
- Semiconductor Quantum Structures and Devices
University of Strathclyde
2016-2025
University of Insubria
2007-2025
University of Glasgow
2024
Institut National de la Recherche Scientifique
2011-2023
Applied Photonics (United Kingdom)
2019-2022
NTT Basic Research Laboratories
2021
Heriot-Watt University
2015-2019
Fraunhofer UK Research
2019
Photonics (United States)
2013-2017
Xi'an Institute of Optics and Precision Mechanics
2016
Entangled frequency combs The ability to generate optical in which the output light is made up of millions sharp lines precisely spaced apart has been important for applications and fundamental science. Reimer et al. now show that can be taken into quantum regime. They took individual teeth quantum-mechanically entangled them form complex states. Because method compatible with existing fiber semiconductor technology, results demonstrate a possible scalable practical platform technologies....
We report a novel geometry for OPOs based on nonlinear microcavity resonators. This approach relies self-locked scheme that enables OPO emission without the need thermal locking of pump laser to resonance. By exploiting CMOS-compatible microring resonator, we achieve oscillation with complete absence shutting down, or self-terminating behavior, very common occurrence in externally pumped OPOs. Further, this consistently produces wide bandwidth (>300nm, limited by our experimental set-up)...
We report an integrated photon pair source based on a CMOScompatible microring resonator that generates multiple, simultaneous, and independent pairs at different wavelengths in frequency comb compatible with fiber communication wavelength division multiplexing channels (200 GHz channel separation) linewidth is quantum memories (110 MHz).It operates self-locked pump configuration, avoiding the need for active stabilization, making it extremely robust even very low power levels.
New propagation regimes for light arise from the ability to tune dielectric permittivity extremely low values. Here, we demonstrate a universal approach based on linear values attained in ε-near-zero (ENZ) regime enhancing nonlinear refractive index, which enables remarkable light-induced changes of material properties. Experiments performed Al-doped ZnO (AZO) thin films show sixfold increase Kerr index (n_{2}) at ENZ wavelength, located 1300 nm region. This turn leads ultrafast order unity,...
Low-frequency currents induced by ultrashort laser-driven ionization can emit extremely broadband, single-cycle terahertz pulses. We present a model that predicts strong wavelength dependence of the THz emission in good agreement with our experimental study. This reveals combined effects plasma rising proportionally to square pump and wavelength-dependent focusing conditions lead 30 times higher at 1800 nm compared an 800 wavelength. Unrivaled electric field strengths 4.4 MV/cm are achieved...
Abstract Nonlinear optical processes are one of the most important tools in modern optics with a broad spectrum applications in, for example, frequency conversion, spectroscopy, signal processing and quantum optics. For practical ultimately widespread implementation, on-chip devices compatible electronic integrated circuit technology offer great advantages terms low cost, small footprint, high performance energy consumption. While many key components have been realized, to date polarization...
Recent development in quantum photonics allowed to start the process of bringing photonic-quantum-based systems out lab into real world applications. As an example, devices for exchange a cryptographic key secured by law mechanics are currently commercially available. In order further boost this process, next step is migrate results achieved means bulky and expensive setups miniaturized affordable devices. Integrated exactly addressing issue. paper we briefly review most recent advancements...
The investigation of integrated frequency comb sources characterized by equidistant spectral modes was initially driven considerations toward classical applications, seeking a more practical and miniaturized way to generate stable broadband light. Recently, in the context scaling complexity optical quantum circuits, these on-chip approaches have provided new framework address challenges associated with non-classical state generation manipulation. For example, multi-photon high-dimensional...
Abstract Induced photon correlations are directly demonstrated by exploring two coupled nonlinear processes in an integrated device. Using orthogonally polarized modes within microring cavity, phase matching of different four‐wave mixing is achieved simultaneously, wherein both share one target frequency mode, while their other differ. The overlap these leads to the coupling processes, producing correlations. nature this process confirmed means time‐ and power‐dependent correlation...
We report an integrated all-optical radio frequency spectrum analyzer based on a ~4 cm long doped silica glass waveguide, with bandwidth greater than 2.5 THz. use this device to characterize the intensity power of ultrahigh repetition rate mode-locked lasers at rates up 400 GHz, and observe dynamic noise related behavior not observable other techniques.
In this Letter we present the measurement of sub-shot-noise spatial correlations without any subtraction background, a result paving way to realize imaging weak objects.
Abstract Nanophotonics and metamaterials have revolutionized the way we think about optical space ( ɛ , μ ), enabling us to engineer refractive index almost at will, confine light smallest of volumes, manipulate signals with extremely small footprints energy requirements. Significant efforts are now devoted finding suitable materials strategies for dynamic control properties. Transparent conductive oxides exhibit large ultrafast nonlinearities under both interband intraband excitations. Here...
The development of technologies for quantum information (QI) science demands the realization. and precise control complex (multipartite high dimensional) entangled systems on practical scalable platforms. Quantum frequency combs (QFCs) represent a powerful tool towards this goal. They enable generation photon states within single spatial mode as well their manipulation using standard fiber-based telecommunication components. Here, we review recent progress in QFCs, with focus results that...
The conversion of a photon’s frequency has long been key application area nonlinear optics. It discussed how slow temporal variation material’s refractive index can lead to the adiabatic shift (AFS) pulse spectrum. Such rigid spectral change relevant technological implications, for example, in ultrafast signal processing. Here, we investigate AFS process epsilon-near-zero (ENZ) materials and show that be achieved shorter length if operating vicinity <mml:math...
Twin entangled beams produced by single-pass parametric down-conversion (PDC) offer the opportunity to detect weak amount of absorption with an improved sensitivity respect standard techniques which make use classical light sources. We propose a differential measurement scheme exploits spatial quantum correlation type-II PDC image amplitude object beyond limit imposed shot noise. By applying quantitative numerical model specific system (a beta-barium borate crystal), we are able identify...
Abstract Multi-level (qudit) entangled photon states are a key resource for both fundamental physics and advanced applied science, as they can significantly boost the capabilities of novel technologies such quantum communications, cryptography, sensing, metrology, computing. The benefits using photons applications draw on their unique properties: propagate over long distances while preserving state coherence, possess multiple degrees freedom (such time frequency) that allow scalable access...
We investigate the spatiotemporal structure of biphoton entanglement in parametric down-conversion (PDC) and we demonstrate its nonfactorable X-shaped geometry. Such a gives access to ultrabroad bandwidth PDC, can be exploited achieve temporal localization femtosecond range. This extreme is connected our ability resolve photon positions source near field. The nonfactorability opens possibility tailoring by acting on spatial degrees freedom twin photons.
We report the simultaneous increase of both nonlinear Kerr coefficient n 2 and third-order susceptibility χ (3) in aluminum zinc oxide (AZO) attained by pumpprobe spectroscopy a frequency degenerate configuration.Our experiments demonstrate 6-fold enhancement over one order magnitude coefficient, while also determining two distinct operational wavelengths for optimal modulation either real or imaginary part complex refractive index.These results, besides providing broader spectral...
Our results show a viable route to free-space quantum-secured communication in an unexplored atmospheric transparency window.
Epsilon-Near-Zero materials exhibit a transition in the real part of dielectric permittivity from positive to negative value as function wavelength. Here we study metal-dielectric layered metamaterials homogenised regime (each layer has strongly subwavelength thickness) with zero near-infrared region. By optically pumping metamaterial experimentally show that close Epsilon-Equal-to-Zero (EEZ) wavelength exhibits marked metallic (negative permittivity) (positive optical power. Remarkably,...