A5049101040- Orbital Angular Momentum in Optics
- Quantum Information and Cryptography
- Near-Field Optical Microscopy
- Quantum optics and atomic interactions
- Laser-Matter Interactions and Applications
- Quantum Mechanics and Applications
- Quantum Computing Algorithms and Architecture
- Advanced Electron Microscopy Techniques and Applications
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Digital Holography and Microscopy
- Metamaterials and Metasurfaces Applications
- Liquid Crystal Research Advancements
- Random lasers and scattering media
- Optical Polarization and Ellipsometry
- Cold Atom Physics and Bose-Einstein Condensates
- Neural Networks and Reservoir Computing
- Photonic and Optical Devices
- Optical Network Technologies
- Plant Reproductive Biology
- Microfluidic and Bio-sensing Technologies
- Mechanical and Optical Resonators
- Optical Wireless Communication Technologies
- Advanced Fluorescence Microscopy Techniques
- Advanced Optical Imaging Technologies
University of Ottawa
2016-2025
National Research Council Canada
2019-2025
Max Planck Institute for the Science of Light
2018-2024
Quantum Technologies (Sweden)
2022-2024
University of Rochester
2017-2023
Institute for Advanced Studies in Basic Sciences
2005-2021
Max Planck - University of Ottawa Centre for Extreme and Quantum Photonics
2015-2021
Seoul National University
2019
Institute for Microelectronics and Microsystems
2017
Istituto Nanoscienze
2014-2017
Structured light refers to the generation and application of custom fields. As tools technology create detect structured have evolved, steadily applications begun emerge. This roadmap touches on key fields within from perspective experts in those areas, providing insight into current state challenges their respective face. Collectively outlines venerable nature research exciting prospects for future that are yet be realized.
Abstract Light beams with a helical phase-front possess orbital angular momentum along their direction of propagation in addition to the spin that describes polarisation. Until recently, it was thought these two ‘rotational’ motions light were largely independent and could not be coupled during light–matter interactions. However, is now known interactions carefully designed complex media can result spin-to-orbit coupling, where change will modify vice versa . In this work, we propose...
A few years ago the possibility of coupling and inter-converting spin orbital angular momentum (SAM OAM) paraxial light beams in inhomogeneous anisotropic media was demonstrated. An important case is provided by waveplates having a singular transverse pattern birefringent optical axis, with topological singularity charge q at plate center, hence named 'q-plates'. The introduction q-plates has given rise recent to number new results significant progress field light. Particularly promising are...
Quantum key distribution (QKD) promises information-theoretically secure communication, and is already on the verge of commercialization. Thus far, different QKD protocols have been proposed theoretically implemented experimentally [1, 2]. The next step will be to implement high-dimensional in order improve noise resistance increase data rate [3-7]. Hitherto, no experimental verification single-photon regime has conducted outside laboratory. Here, we report realization such a system...
Vector modes are spatial that have spatially inhomogeneous states of polarization, such as, radial and azimuthal polarization. In this work, the polarization vector used to increase transmission data rate free-space optical communication via mode division multiplexing. A (de)multiplexer for based on a liquid crystal q-plate is introduced. As proof principle, four each carrying 20-Gbit/s quadrature phase shift keying signal (aggregate 80 Gbit/s) single wavelength channel (λ∼1550 nm) were...
Light with twist and structure Möbius strips are three-dimensional structures consisting of a surface just single side. Readily demonstrated by snipping paper ring, adding twist, then joining the ends together again, these have intriguing mathematical properties in terms topology geometry. Bauer et al. used liquid crystal to engineer wavefront laser beam make an optical version strip effectively “snipping twisting” polarization light beam. Science , this issue p. 964
We describe the polarization topology of vector beams emerging from a patterned birefringent liquid crystal plate with topological charge q at its center (q-plate). The structures for different q-plates and input states have been studied experimentally by measuring Stokes parameters point-by-point in beam transverse plane. Furthermore, we used tuned q=1/2-plate to generate cylindrical radial or azimuthal polarizations, possibility switching dynamically between these two cases simply changing...
The optical "spin-orbit" coupling occurring in a suitably patterned nonuniform birefringent plate known as `q-plate' allows entangling the polarization of single photon with its orbital angular momentum (OAM). This process, turn, can be exploited for building bidirectional "spin-OAM interface", capable transposing quantum information from spin to OAM degree freedom photons and \textit{vice versa}. Here, we experimentally demonstrate this process by single-photon tomographic analysis....
A phase-only hologram applies a modal transformation to an optical transverse spatial mode via phase encoding and intensity masking. Accurate control of the field crucially depends on method employed encode hologram. In this Letter, we present amplitude into hologram, which allows exact modes. Any masking modulates alters field. Our consists in correcting for unwanted alteration by modifying encryption accordingly. We experimentally verify accuracy our applying it generation detection modes...
Spin to orbital angular momentum (OAM) conversion using a device known as q-plate has gained recent attention convenient means of creating OAM beams. We show that the dispersive properties q=1/2 plate, specifically its group index difference Δng for ordinary and extraordinary polarization light, can be tuned achieving single-aperture, alignment-tolerant stimulated emission depletion (STED) nanoscopy with versatile control over color combinations well laser bandwidths. Point spread function...
Inspired by the classical phenomenon of random walk, concept quantum walk has emerged recently as a powerful platform for dynamical simulation complex systems, entanglement production and universal computation. Such wide perspective motivates renewing search efficient, scalable stable implementations this process. Photonic approaches have hitherto mainly focused on multi-path schemes, requiring interferometric stability number optical elements that scales quadratically with steps. Here we...
Abstract Optical vortices, which carry orbital angular momentum (OAM), can be flexibly produced and measured with infrared visible light. Their application is an important research topic for super-resolution imaging, optical communications quantum optics. However, only a few methods produce OAM beams in the extreme ultraviolet (XUV) or X-ray, controlling on these remains challenging. Here we apply wave mixing to tabletop high-harmonic source, as proposed our previous work, control...
Soliton molecules (SMs) are fundamentally important modes in nonlinear optical systems. It is a challenge to experimentally produce SMs with required temporal separation mode-locked fiber lasers. Here, we propose and realize an experimental scenario for harnessing SM dynamics laser setup. In particular, tailor controlled by second-order group-velocity dispersion losses: the real part of maintains balance between nonlinearity, while loss determines gain losses. The results demonstrate that...
The fractional Schrödinger equation (FSE)-a natural extension of the standard equation-is basis quantum mechanics. It can be obtained by replacing kinetic-energy operator with a derivative. Here, we report experimental realisation an optical FSE for femtosecond laser pulses in temporal domain. Programmable holograms and single-shot measurement technique are respectively used to emulate Lévy waveguide reconstruct amplitude phase pulses. Varying index initial pulse, dynamics is observed...
Abstract Structured waves are ubiquitous for all areas of wave physics, both classical and quantum, where the wavefields inhomogeneous cannot be approximated by a single plane wave. Even interference two waves, or (evanescent) wave, provides number nontrivial phenomena additional functionalities as compared to Complex with inhomogeneities in amplitude, phase, polarization, including topological structures singularities, underpin modern nanooptics photonics, yet they equally important, e.g....
Abstract High-dimensional biphoton states are promising resources for quantum applications, ranging from high-dimensional communications to imaging. A pivotal task is fully characterizing these states, which generally time-consuming and not scalable when projective measurement approaches adopted; however, new advances in coincidence imaging technologies allow overcoming limitations by parallelizing multiple measurements. Here we introduce digital holography, analogy off-axis where of the...
Abstract A nonlinear optical platform is presented to emulate a Lévy waveguide that supports the pulse propagation governed by generalized fractional Schrödinger equation (FNLSE). This approach distinguishes between intra‐cavity and extra‐cavity regimes, exploring interplay effective group‐velocity dispersion (FGVD) Kerr nonlinearity. In configuration, stable solitons enabled an engineered combination of regular dispersions in fiber cavity are observed. The soliton pulses exhibit their...
We studied a novel family of paraxial laser beams forming an overcomplete yet nonorthogonal set modes. These modes have singular phase profile and are eigenfunctions the photon orbital angular momentum. The intensity is characterized by single brilliant ring with singularity at its center, where field amplitude vanishes. complex proportional to degenerate (confluent) hypergeometric function, therefore we term such hypergeometric-Gaussian (HyGG) Unlike recently introduced [Opt. Lett. 32, 742...
We present methods for generating and sorting specific orbital angular momentum (OAM) eigenmodes of a light beam with high efficiency, using liquid crystal birefringent plate unit topological charge, known as \qo{q-plate}. The generation efficiency has been optimized by tuning the optical retardation q-plate temperature. measured OAM $m=\pm2$ from an input TEM$_{00}$ was 97%. Mode two achieved 81% extinction-ratio (or cross-talk) larger than 4.5:1.
We present a convenient method to generate vector beams of light having polarization singularities on their axis, via partial spin-to-orbital angular momentum conversion in suitably patterned liquid crystal cell. The resulting patterns exhibit C-point the beam axis and an L-line loop around it, may have different geometrical structures such as \qo{lemon}, \qo{star}, \qo{spiral}. Our generation allows us control radius central C-point. Moreover, we investigate free-air propagation these...
We demonstrate electromagnetic quantum states of single photons and correlated photon pairs exhibiting ``hybrid'' entanglement between spin orbital angular momentum. These are obtained from entangled emitted by spontaneous parametric down conversion employing a $q$ plate for coupling the degrees freedom photon. Entanglement contextual behavior (that is also nonlocal, in case pairs) demonstrated reported violation Clauser-Horne-Shimony-Holt inequality. In addition, classical analog hybrid...