A5063890570- Laser-Matter Interactions and Applications
- Plasmonic and Surface Plasmon Research
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Strong Light-Matter Interactions
- Thermal Radiation and Cooling Technologies
- Advanced Fiber Laser Technologies
- Atomic and Subatomic Physics Research
- Spectroscopy and Quantum Chemical Studies
- Mass Spectrometry Techniques and Applications
- Photonic and Optical Devices
- Quantum and electron transport phenomena
- Quantum Information and Cryptography
- Advanced Frequency and Time Standards
- Advanced Electron Microscopy Techniques and Applications
- Advanced X-ray Imaging Techniques
- Laser-induced spectroscopy and plasma
- Spectroscopy and Laser Applications
- Nonlinear Optical Materials Studies
- Quantum optics and atomic interactions
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Biosensing Techniques and Applications
- Near-Field Optical Microscopy
- Photochemistry and Electron Transfer Studies
Trinity College Dublin
2021-2024
ORCID
2021
Queen's University Belfast
2018-2020
Attosecond chronoscopy is central to the understanding of ultrafast electron dynamics in matter from gas condensed phase with attosecond temporal resolution. It has, however, not yet been possible determine timing individual partial waves, and steering their contribution has a substantial challenge. Here, we develop polarization-skewed serving as wave meter reveal role each angle-resolved photoionization shifts rare atoms. We steer relative ratio between different waves realize...
The strong-coupling interaction between quantum emitters and cavities provides the archetypical platform for fundamental electrodynamics. Here we show that methylene blue (MB) molecules interact coherently with subwavelength plasmonic nanocavity modes at room temperature. Experimental results strong coupling can be switched on off reversibly when MB undergo redox reactions which transform them to leuco-methylene molecules. In simulations demonstrate second excited cavity mode resonant...
A discussion is given of the process whereby a substituted aromatic molecule captures slow electron and dissociates. It shown that often goes via two stages, relative symmetries electron-capture state final dissociation are very important. Both sensitivity to changes in substituent existence an activation energy explained model.
We describe an ab initio and non-perturbative $R$-matrix with time-dependence theory for ultrafast atomic processes in light fields of arbitrary polarization. The is applicable to complex, multielectron atoms ions subject ultrashort (particularly few-femtosecond attosecond) laser pulses any given ellipticity, generalizes previous time-dependent techniques restricted linearly polarized fields. discuss both the fundamental equations, required propagate wavefunction time, as well computational...
The ab initio $R$-matrix with time method has recently been extended to allow simulation of fully nonperturbative multielectron processes in molecules driven by ultrashort arbitrarily polarized strong laser fields. Here we demonstrate the accuracy and capabilities current implementation for two targets: We study single-photon multiphoton ionization ${\mathrm{H}}_{2}$ one-photon strong-field ${\mathrm{H}}_{2}\mathrm{O}$ compare results available experimental theoretical data as well our own...
Abstract Plexcitonic strong coupling has ushered in an era of room‐temperature quantum electrodynamics at the nanoscale. Realizing its potential applications from single‐molecule spectroscopy to technologies on industrial level requires scalable and mass‐producible plasmonic cavities that provide ease access control for emitters. Here, a strategy multidimensional hotspot engineering is proposed via rational selection substrates, which facilitates elevation gold bowtie nanocavity top device...
Abstract Light-matter superposition states obtained via strong coupling play a decisive role in quantum information processing, but the deleterious effects of material dissipation and environment-induced decoherence inevitably destroy coherent light-matter polaritons over time. Here, we propose use perfect absorption under near-field driving to prepare protect polaritonic single emitter interacting with plasmonic nanocavity at room temperature. Our scheme nanoplasmonic leverages an inherent...
Recent experiments [D. Pengel, S. Kerbstadt, L. Englert, T. Bayer, and M. Wollenhaupt, Phys. Rev. A 96 043426 (2017)] have measured the photoelectron momentum distribution for three-photon ionization of potassium by counter-rotating circularly polarized 790-nm laser pulses. The displays spiral vortices, arising from interference ionizing wave packets with different magnetic quantum numbers. high level multidimensional detail observed in makes this an ideal case which to demonstrate accuracy...
We use the $R$-matrix with time dependence method to study detachment from ${\mathrm{F}}^{\ensuremath{-}}$ in circularly polarized laser fields of infrared wavelength. By decomposing photoelectron momentum distribution into separate contributions detached $2{p}_{1}$ and $2{p}_{\ensuremath{-}1}$ electrons, we demonstrate that yield is distributed asymmetrically respect these initial orbitals. observe well-known preference for strong-field electrons are initially counter-rotating relative...
We use $R$-matrix with time-dependence theory, spin-orbit effects included, to study krypton irradiated by two time-delayed extreme ultraviolet ultrashort pulses. The first pulse excites the atom $4{s}^{2}4{p}^{5}5s$. second then $4s4{p}^{6}5s$ autoionizing levels, whose population can be observed through their subsequent decay. By varying time delay between pulses, we are able control excitation pathway states. of cross-polarized light pulses allows us isolate two-photon pathway, one photon...
We employ the R-matrix with time-dependence method to investigate extreme-ultraviolet-initiated high-harmonic generation (XIHHG) in Ar$^{+}$. Using a combination of extreme-ultraviolet (XUV, $92\textrm{ nm}$, $3\times 10^{12}\,\textrm{Wcm}^{-2}$) and time-delayed, infrared (IR, $800\textrm{ 10^{14}\,\textrm{Wcm}^{-2}$) laser pulses, we demonstrate that control over both mechanism, timing, ionization can afford significant enhancements yield plateau, sub-threshold, harmonics alike. The...
Abstract In recent years, quantum nanophotonics has forged a rich nexus of nanotechnology with photonic information processing, offering remarkable prospects for advancing technologies beyond their current technical limits in terms physical compactness, energy efficiency, operation speed, temperature robustness and scalability. this perspective, we highlight number studies that reveal the especially compelling potential nanoplasmonic cavity electrodynamics driving down to nanoscale spatial...
We employ the $R$ matrix with time-dependence method to study attosecond angular streaking of ${\mathrm{F}}^{\ensuremath{-}}$. Using this negative ion, free long-range Coulomb interactions, we elucidate role short-range electron correlation effects in an attoclock scheme. Through solution multielectron time-dependent Schr\"odinger equation, aim bridge gap between experiments using targets, and one-electron theoretical approaches. observe significant offset angles photoelectron momentum...
Plasmonic nanocavities have emerged as a promising platform for next-generation spectroscopy, sensing and photonic quantum information processing technologies, benefiting from unique confluence of nanoscale compactness integrability, ultrafast functionality room-temperature viability. Harnessing their unprecedented optical field confinement enhancement properties such diverse application domains, however, demands continued innovation in cavity design robust strategies engineering plasmonic...
Through solution of the multielectron, semirelativistic, time-dependent Schr\"odinger equation, we show that angular streaking produces strongly spin-polarized electrons in a noble gas. The degree spin polarization increases with Keldysh parameter, so streaking---ordinarily applied to investigate tunneling---may be repurposed generate electron bunches. Additionally, explore modifications scheme also enhance polarization.
With a growing demand for detecting light at the single-photon level in various fields, researchers are focused on optimizing performance of superconducting detectors (SSPDs) by using multiple approaches. However, input coupling visible has remained challenge development efficient SSPDs. To overcome these limitations, we developed novel system that integrates NbN microwire photon (SMPDs) with gap-plasmon resonators to improve detection efficiency 98% while preserving all detector features,...
In recent years, quantum nanophotonics has forged a rich nexus of nanotechnology with photonic information processing, offering remarkable prospects for advancing technologies beyond their current technical limits in terms physical compactness, energy efficiency, operation speed, temperature robustness and scalability. this perspective, we highlight number studies that reveal the especially compelling potential nanoplasmonic cavity electrodynamics driving down to nanoscale spatial ultrafast...
Using subdiffracted light from a nanoplasmonic resonator we demonstrate hot-spot nanoheating control of quantum operations at elevated temperatures via temperature-induced shifts the transition energies individual qubits in and out resonance with near-field. This introduces dynamical switch for optical control, significantly elevating solid-state information processing technologies towards higher temperatures.
The extreme electromagnetic near-field environment of nanoplasmonic resonators and metamaterials can give rise to unprecedented heating effects, enabling large manipulable temperature gradients on the order 10 1 –10 2 K/nm. In this Letter, by interfacing traditional semiconductor quantum dots with industry-grade plasmonic transducer technology, we demonstrate that near-field-induced thermal gradient facilitate requisite population inversion for coherent phonon amplification lasing at...
Abstract Near‐field plasmonics is a burgeoning field that has unlocked several opportunities related to quantum information processing, single‐molecule spectroscopy, and cavity electrodynamics. All of which require the adept control light, heat, charges on nanoscale. In particular, nanoresonators near‐field transducers (NFTs) have ability subdiffract light well below classical diffraction limit by coupling photon mode plasmonic mode. Herein, advantage taken nanoscale source produced an NFT...
We investigate the Moiré and Seebeck-Peltier effects in thin-film black phosphorous under excitation from a near-field plasmonic resonator. demonstrate ability to directionally steer electrical current adeptly manipulate temperature on nanoscale.
We explore the entanglement of quantum emitters using subdiffracted light within a near-field plasmonic environment. Results show possibilities for performance operations fully integrated photonic and waveguides on ultrafast time scales.