A5069173230- Plasmonic and Surface Plasmon Research
- Metamaterials and Metasurfaces Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Spectroscopy and Quantum Chemical Studies
- Orbital Angular Momentum in Optics
- Photonic and Optical Devices
- Molecular spectroscopy and chirality
- Photonic Crystals and Applications
- Near-Field Optical Microscopy
- Nonlinear Optical Materials Studies
- Magnetic properties of thin films
- Optical and Acousto-Optic Technologies
- Magneto-Optical Properties and Applications
- Optical Coatings and Gratings
- Quantum optics and atomic interactions
- Quantum Dots Synthesis And Properties
- Photoreceptor and optogenetics research
- Biosensors and Analytical Detection
- Characterization and Applications of Magnetic Nanoparticles
- Nonlinear Optical Materials Research
- Microplastics and Plastic Pollution
- Electromagnetic Scattering and Analysis
- Photorefractive and Nonlinear Optics
- Iron oxide chemistry and applications
- Optical Polarization and Ellipsometry
University of Bath
2016-2025
Centre de Nanosciences et de Nanotechnologies
2019
University of Cambridge
2012-2016
KU Leuven
2007-2013
Hazara University
2012
Transnational University Limburg
2009
Radboud University Nijmegen
2005-2008
Throughout the 19 th and 20 century, chirality has mostly been associated with chemistry. However, while can be very useful for understanding molecules, molecules are not well suited chirality. Indeed, size of atoms, length molecular bonds orientations orbitals cannot varied at will. It is therefore difficult to study emergence evolution in as a function geometrical parameters. By contrast, chiral metal nanostructures offer an unprecedented flexibility design. Modern nanofabrication allows...
Micro- and nanoplastics are considered one of the top pollutants that threaten environment, aquatic life, mammalian (including human) health. Unfortunately, development uncomplicated but reliable analytical methods sensitive to individual microplastic particles, with sizes smaller than 1 μm, remains incomplete. Here, we demonstrate detection identification (single) micro- by using surface-enhanced Raman spectroscopy (SERS) Klarite substrates. is an exceptional SERS substrate; it shaped as a...
The increasing prevalence of nanoplastics in the environment underscores need for effective detection and monitoring techniques. Current methods mainly focus on microplastics, while accurate identification is challenging due to their small size complex composition. In this work, we combined highly reflective substrates machine learning accurately identify using Raman spectroscopy. Our approach established spectroscopy data sets nanoplastics, incorporated peak extraction retention processing,...
We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made gold. The arrangement G shapes is crucial since upon reordering them SHG-CD effect disappears. Microscopy reveals SHG "hotspots" assemblies, which originate enantiomerically sensitive plasmon modes, having novel property exhibiting a geometry themselves relation with handedness material. These results open new frontiers studying chirality.
We present a new electromagnetic phenomenon-the asymmetric second-harmonic generation from planar chiral structures. The effect consists in distinguishing the handedness of material by rotating sample an experiment involving solely linearly polarized light. This phenomenon originates surface plasmon resonance gold nanostructures, where homodyne interference anisotropic and electric and/or magnetic multipoles appears to play important role.
Photo-electrochemical water splitting is a very promising and environmentally friendly route for the conversion of solar energy into hydrogen. However, solar-to-H2 efficiency still low due to rapid bulk recombination charge carriers. Here, photonic nano-architecture developed improve carrier generation separation by manipulating confining light absorption in visible-light-active photoanode constructed from BiVO4 crystal plasmonic nanostructures. Synergistic effects stop bands are observed...
Nanomaterials find increasing application in communications, renewable energies, electronics and sensing. Because of its unsurpassed speed highly tuneable interaction with matter, using light to guide the self-assembly nanomaterials can open up novel technological frontiers. However, large-scale light-induced assembly remains challenging. Here we demonstrate an efficient route nano-assembly through plasmon-induced laser threading gold nanoparticle strings, producing conducting threads 12±2...
Significance Scientists have dreamt of nanomachines that can navigate in water, sense their environment, communicate, and respond. Various power sources propulsion systems been proposed but they lack speed, strength, control. We introduce here a previously undefined paradigm for nanoactuation which is incredibly simple, solves many problems. It optically powered (although other modes are also possible), potentially offers unusually large force/mass. This looks to be widely generalizable,...
Circularly polarized light is incident on a nanostructured chiral meta-surface. In the unit cells whose chirality matches that of light, superchiral forming and strong optical second harmonic generation can be observed. Due to favorable power-law scaling near-field enhancements, nonlinear properties plasmonic nano- metamaterials are prime fundamental practical interest. However, these remain largely unexplored. Here we demonstrate chiroptical effects sensitive enhancements therefore used...
3D chirality is shown to be unnecessary for introducing strong circular dichroism harmonic generations. Specifically, near-unity both second-harmonic generation and third-harmonic generations demonstrated on suitably designed ultrathin plasmonic metasurfaces with only 2D planar chirality. The study opens up new routes designing chip-type biosensing platform, which may allow highly sensitive detection of bio- chemical molecules weak As a service our authors readers, this journal provides...
Abstract Recent advances in nonlinear optics, hot electrons for renewable energy (e.g., solar cells and water‐splitting), acousto‐optics, nanometalworking, nanorobotics, steam generation, photothermal cancer therapy are reviewed here. In all these areas, one of the key enabling properties is ability metallic nanoparticles to harvest control light at subwavelength scale by supporting coherent electronic oscillations, called localized surface plasmon resonances (LSPRs). Various physical...
A simple and rapid method for detecting chemical components of individual aerosol particles on Klarite substrate with surface-enhanced Raman spectroscopy (SERS) is described. For both single simulated ambient atmospheric particles, this new analytical promotes the enhancement factor signal. The spectra ammonium sulfate naphthalene at microscopic level are enhanced by a 6 therefore greatly improve detection composition an particle. When found over domain, set information can be obtained via...
Photochemistry and photocatalysis are promising approaches to derive solar energy for solving the global environment crisis. However, some practical aspects remain daunting, mainly due slow reaction kinetics, especially multiphase reactions involving gaseous reactants. Here, we report that oxidation of methyl orange, golden orange II, levoglucosan by Fe(III)-oxalate photochemistry g-C3N4 can be significantly increased (up two orders magnitude) with decreasing microdroplet diameter, from...
Abstract With the growing global energy crisis, research into new materials that can potentially transfer heat electricity has become a worldwide imperative. Pyroelectric are polar able to produce electrical charge in response temperature change. These of interest for infrared sensing, harvesting, and emerging applications chemistry biology. However, unlocking their potential requires changes be both large rapid. To achieve this goal, pyroelectric used synergy with plasmonic nanomaterials,...
Because of its high surface and interface sensitivity, the nonlinear optical technique second harmonic generation (SHG) is a designated method for investigating nanostructured metal surfaces. Indeed, latter present surface-to-volume ratio, but even more importantly, they can exhibit strong near-field enhancements or "hot spots". Hot spots often appear as result geometric features on nanoscale plasmon resonances, which are collective electron oscillations that, nanoscale, readily be excited...
We studied the adsorption kinetics of supported ultrathin films dye-labeled polystyrene (l-PS) by combining dielectric spectroscopy (DS) and interface-specific nonlinear optical second harmonic generation (SHG) technique. While DS is sensitive to fraction mobile dye moieties (chromophores), SHG signal probes their anisotropic orientation. Time-resolved measurements were performed above glass transition temperature on two different sample geometries. In one configuration, l-PS layer placed in...
Because of their large figures merit, surface lattice resonances (SLRs) in metal nanoparticle arrays are very promising for chemical and biomolecular sensing both liquid gas media. SLRs sensitive to refractive index changes near the nanoparticles (surface sensitivity) volume between them (bulk sensitivity). its intrinsic surface-sensitivity a power law dependence on electric fields, second harmonic generation (SHG) spectroscopy can improve upon sensitivities SLRs. In this report SHG...
We present direct experimental mapping of the lateral magnetic near-field distribution in plasmonic nanoantennas using aperture scanning optical microscopy (SNOM). By means full-field simulations it is demonstrated how coupling hollow-pyramid probe to nanoantenna induces an effective dipole which efficiently excites surface plasmon resonances only at field maxima. This excitation turn affects detected light intensity enabling visualization multiple odd and even order modes with subwavelength...