A5035538560- Orbital Angular Momentum in Optics
- Optical Polarization and Ellipsometry
- Quantum optics and atomic interactions
- Nonlinear Photonic Systems
- Advanced Fiber Laser Technologies
- Digital Holography and Microscopy
- Cold Atom Physics and Bose-Einstein Condensates
- Photonic and Optical Devices
- Laser-Matter Interactions and Applications
- Near-Field Optical Microscopy
- Geometric and Algebraic Topology
- Quantum chaos and dynamical systems
- Photonic Crystals and Applications
- Quantum Information and Cryptography
- Plasmonic and Surface Plasmon Research
- Advanced Materials and Mechanics
- Advanced Optical Imaging Technologies
- Random lasers and scattering media
- Metamaterials and Metasurfaces Applications
- Liquid Crystal Research Advancements
- Mechanical and Optical Resonators
- Ocean Waves and Remote Sensing
- Quantum Mechanics and Applications
- Congenital Heart Disease Studies
- Computational Geometry and Mesh Generation
University of Birmingham
2016-2024
University of Bristol
2013-2023
Royal Prince Alfred Hospital
2017-2021
The University of Sydney
2019-2021
Engineering and Physical Sciences Research Council
2020-2021
The Christie Hospital
2020
University of Nottingham
2020
The Christie NHS Foundation Trust
2019
University of Rochester
2017
Eglin Air Force Base
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.
We present a new solution of the paraxial equation based on Pearcey function, which is related to Airy function and describes diffraction about cusp caustic. The beam displays properties similar not only beams but also Gaussian Bessel beams. These include an inherent auto-focusing effect, as well form-invariance propagation self-healing. describe theory propagating experimental verification their self-healing behaviour.
Superoscillations are band-limited functions with the counterintuitive property that they can vary arbitrarily faster than their fastest Fourier component, over long intervals. Modern studies originated in quantum theory, but there were anticipations radar and optics. The mathematical understanding—still being explored—recognises extremely small where superoscillate; this has implications for information theory. Applications to optical vortices, sub-wavelength microscopy related areas of...
Three-dimensional (3D) topological states resemble truly localised, particle-like objects in physical space. Among the richest such structures are 3D skyrmions and hopfions that realise integer numbers their configuration via homotopic mappings from real space to hypersphere (sphere 4D space) or 2D sphere. They have received tremendous attention as exotic textures particle physics, cosmology, superfluids, many other systems. Here we experimentally create measure a skyrmionic hopfion fully...
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....
The singularities of complex scalar waves are their zeros; these dislocation lines in space, or points the plane. For and plane (propagating two dimensions, sections propagating three), we calculate some statistics associated with dislocations for isotropically random Gaussian ensembles, that is, superpositions equidistributed direction but phases. are: mean length line per unit volume, density plane; eccentricity ellipse describing anisotropic squeezing phase close to cores; distribution...
Following Nye & Hajnal, we explore the geometry of complex vector waves by regarding them as a field polarization ellipses. Singularities this are C lines and L lines, where is purely circular linear, respectively. The singularities can be reinterpreted loci photon spin 1 (C lines) 0 (L lines). For Gaussian random superpositions plane equidistributed in direction but with an arbitrary frequency spectrum, calculate density (length per unit volume) lines.
Optical vortices generically arise when optical beams are combined. Recently, we reported how several laser containing could be combined to form vortex loops, links and knots embedded in a light beam (Leach et al 2004). Here, describe detail the experiments which loops these structures. The experimental construction follows theoretical model originally proposed by Berry Dennis, synthesised using programmable spatial modulator imaged CCD camera.
Optical vortices (nodal lines and phase singularities) are the generic singularities of scalar optics but unstable in vector optics. We investigate experimentally theoretically unfolding a uniformly polarized optical vortex beam on propagation through birefringent crystal characterize output field terms polarization (C points circular polarization; L surfaces linear polarization). The is described both 2-dimensional transverse plane, three dimensions, where third abstract, representing an...
Exact solutions of the Helmholtz equation are constructed, possessing wavefront dislocation lines (phase singularities) in form knots or links where wave function vanishes (‘knotted nothings’). The construction proceeds by making a nongeneric structure with strength n loop threaded m line, and then perturbing this. In resulting unfolded (stable) structure, becomes an (m, n) torus knot if coprime, N linked rings have common factor N; m-stranded helix. our explicit implementation, is...
Using a new formalism involving projection from the sphere of directions to stereographic plane, and associated complex variables, explicit formulae are obtained for two refractive indices polarizations in optically anisotropic crystals that both dichroic (absorbing) chiral (optically active). This enables three types polarization singularity be classified explored: singular axes, which degeneracies where equal, transparent non–chiral crystal condense pairwise onto optic axes; C points, is...
Motivated by the recent discovery of electron vortex beams carrying orbital angular momentum (AM), we construct exact Bessel-beam solutions Dirac equation. They describe relativistic and nonparaxial corrections to scalar beams. We spin AM with Berry-phase predict intrinsic spin-orbit coupling in free space. This can be observed as a spin-dependent probability distribution focused Moreover, magnetic moment is calculated, which shows different g factors for also contains correction.
Super-oscillatory optical lenses have recently been shown to achieve subwavelength focusing and used for super-resolution imaging. However, the hotspots created by these are always accompanied sidebands containing a significant fraction of energy highly localised in axial direction. Here, we report class super-oscillatory that form extended needles on 15λ field view.
By putting electrons through a phase-modulation hologram, thin film of silicon nitride with nanoscale grooves different thicknesses, scientists achieve, for the first time, generation diffraction-free electron Bessel beams.
Structured light has revolutionized optical particle manipulation, nano-scaled material processing, and high-resolution imaging. In particular, propagation-invariant fields such as Bessel, Airy, or Mathieu beams show high robustness have a self-healing nature. To generalize beneficial features, these can be understood in terms of caustics. However, only simple caustics found applications trapping, cell microscopy. Thus, technologies would greatly benefit from methods to engineer arbitrary...