A5059844278- Laser-Matter Interactions and Applications
- Spectroscopy and Quantum Chemical Studies
- Quantum optics and atomic interactions
- Spectroscopy and Laser Applications
- Advanced Fiber Laser Technologies
- Plasmonic and Surface Plasmon Research
- Photonic and Optical Devices
- Cold Atom Physics and Bose-Einstein Condensates
- Laser Design and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Atomic and Subatomic Physics Research
- Quantum Information and Cryptography
- Metamaterials and Metasurfaces Applications
- Molecular spectroscopy and chirality
- Spectroscopy Techniques in Biomedical and Chemical Research
- Diamond and Carbon-based Materials Research
- Near-Field Optical Microscopy
- Advanced Chemical Physics Studies
- Force Microscopy Techniques and Applications
- Orbital Angular Momentum in Optics
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Photorefractive and Nonlinear Optics
- Boron and Carbon Nanomaterials Research
- Integrated Circuits and Semiconductor Failure Analysis
Weizmann Institute of Science
2015-2024
East China Normal University
2020-2022
Shanxi University
2021
Applied Precision (Slovakia)
2019
Ernst Ruska Centre
2010
Institute of Solid State Chemistry
2010
TU Dresden
2006-2010
Seoul National University
2003
Core Competence
1987
Harvard University
1979-1981
Nanostructured metasurfaces offer unique capabilities for local control of the phase and amplitude transmitted reflected optical waves. Based on this potential, a large number have been proposed in recent years as alternatives to standard elements. In most cases, however, these elements suffer from chromatic aberrations, thus limiting their usefulness multi-wavelength or broadband applications. Here, order alleviate correct aberrations individual diffractive elements, we introduce dense...
Abstract A hologram is an optical element storing phase and possibly amplitude information enabling the reconstruction of a three-dimensional image object by illumination scattering coherent beam light, generated at same wavelength as input laser beam. In recent years, it was shown that can be stored in nanometric antennas giving rise to ultrathin components. Here we demonstrate nonlinear multilayer metamaterial holograms. background free formed new frequency—the third harmonic illuminating...
The first observation of pressure-induced extra resonant enhancements a coherent four-wave---mixing signal is reported. When the difference between two input frequencies, ${\ensuremath{\omega}}_{1}$ and ${\ensuremath{\omega}}_{2}$, corresponds to separation unpopulated upper levels, enhancement generated intensity at $2{\ensuremath{\omega}}_{1}\ensuremath{-}{\ensuremath{\omega}}_{2}$ caused by collisions.
Metasurfaces, and in particular those containing plasmonic-based metallic elements, constitute a particularly attractive set of materials. By means modern nanolithographic fabrication techniques, flat, ultrathin optical elements may be constructed. However, spite their strong nonlinearities, plasmonic metasurfaces have so far been investigated mostly the linear regime. Here we introduce full nonlinear phase control over metasurfaces. We show that for interactions phase-gradient metasurface...
We demonstrate strong coupling between molecular excited states and surface plasmon modes of a slit array in thin metal film. The manifests itself as an anticrossing behavior the two newly formed polaritons. As strength grows, new mode emerges, which is attributed to long-range interactions mediated by plasmonic field. new, molecular-like repels polariton states, leads opening energy gaps both below above asymptotic free molecule energy.
Abstract Spectroscopy aims at extracting information about matter through its interaction with light. However, when performed on gas and liquid phases as well solid lacking long‐range order, the extracted spectroscopic features are in fact averaged over molecular isotropic angular distributions. The reason is that light–matter processes depend angle between transitional dipole polarization of light interacting it. This understanding gave birth to constantly expanding field “laser‐induced...
Tin disulfide pellets were laser ablated in an inert gas atmosphere, and closed cage fullerene-like (IF) nanoparticles produced. The had various polyhedra short tubular structures. Some of these forms contained a periodic pattern fringes resulting superstructure. These patterns could be assigned to superlattice created by stacking layered SnS2 SnS. Such superlattices are reminiscent misfit layer compounds, which known form morphologies. This mechanism adds up the established for IF...
Get PDF Email Share with Facebook Tweet This Post on reddit LinkedIn Add to CiteULike Mendeley BibSonomy Citation Copy Text Yehiam Prior, "Three-dimensional phase matching in four-wave mixing," Appl. Opt. 19, 1741_1-1743 (1980) Export BibTex Endnote (RIS) HTML Plain alert Save article
The complete expression, including all 48 terms, for the third-order nonlinear susceptibility <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">\chi^{(3)}</tex> is written down explicitly. diagrammatic and perturbative approaches to its derivation are matched compared. use of nontime-ordered (one-sided) diagrams discussed shown give incomplete results.
We introduce a new scheme for controlling the sense of molecular rotation. By varying polarization and delay between two ultrashort laser pulses, we induce unidirectional rotation, thereby forcing molecules to rotate clockwise/counterclockwise under field-free conditions. show that unidirectionally rotating are confined plane defined by vectors which leads permanent anisotropy in angular distribution. The latter may be useful collisional cross-sections optical kinetic processes gases....
We present one of the simplest classical systems featuring echo phenomenon-a collection randomly oriented free rotors with dispersed rotational velocities. Following excitation by a pair time-delayed impulsive kicks, mean orientation or alignment ensemble exhibits multiple echoes and fractional echoes. elucidate mechanism formation kick-induced filamentation phase space, provide first experimental demonstration in thermal gas CO_{2} molecules excited femtosecond laser pulses.
We experimentally demonstrate field-free, spin-selective alignment of ortho- and para molecular spin isomers at room temperature. By means two nonresonant, strong, properly delayed femtosecond pulses within a four wave mixing arrangement, we observed selective for homonuclear diatomics composed $1/2$ ($^{15}\mathrm{N}$) or $1$ ($^{14}\mathrm{N}$) atoms. The achieved control the isomers' angular distribution rotational excitation may find applications to analysis, enrichment, actual physical...
We experimentally demonstrate isotope-selective alignment in a mixture of $^{14}\mathrm{N}_{2}$, $^{15}\mathrm{N}_{2}$ isotopes. Following strong ultrashort laser pulse rotational excitation, the angular distributions isotopes gradually become different due to mismatch their moments inertia. At predetermined times, desired isotope attains an aligned state while other component is antialigned, facilitating further selective manipulations by polarized light. By properly timed second pulse,...
Opening the window: Hollow multilayer nano-octahedra (see TEM image and structure) often appear in laser-ablation products of layered transition-metal chalcogenides. Calculations on MoS2 nanoparticles demonstrate that exist a window stability between nanoplatelets spherical fullerene-like nanoparticles. Tungsten molybdenum dichalcogenides have structure similar to graphite. (inorganic fullerenes (IFs)) nanotubes (INTs)) been synthesized from these inorganic compounds.1–3 Theoretical...
Phase-matched four-wave mixing in sodium vapor with a helium buffer gas is carried out noncoplanar geometry. The directions of the four light beams remain nondegenerate even if all frequencies are equal. A sharp zero-difference frequency resonance intensity parametrically generated fourth beam by three incident observed that proportional to square pressure gas. theoretical interpretation this effect caused elimination destructive interference between two coherent pathways presented.
The nonlinear response of subwavelength nanocavities in thin silver films are investigated. We report on significant enhancements the second harmonic generation (SHG) when fundamental wavelength matches dimensional resonances within nanocavities. polarization properties studied as well and found to be correlated with cavity shape symmetry. In some internal nanocorrugations, giant field observed, making them excellent candidates for high sensitivity spectroscopy.
Molecular alignment and orientation by laser fields has attracted significant attention in recent years, mostly due to new capabilities manipulate the molecular spatial arrangement. Molecules can now be efficiently prepared for ionization, structural imaging, orbital tomography, more, enabling, example, shooting of dynamic movies. Furthermore, processes give rise fundamental quantum classical phenomena like revivals, Anderson localization, rotational echoes, just mention a few. We review...
The nonlinear optical dynamics of nano-materials comprised plasmons interacting with quantum emitters is investigated by a self-consistent model based on the coupled Maxwell-Liouville-von Neumann equations. It shown that ultra-short resonant laser pulses significantly modify properties such hybrid systems. further demonstrated energy transfer between molecules and occurs femtosecond time scale can be controlled both material parameters.
We demonstrate strong coupling of nanocavities in metal films, sparked by propagating surface plasmons. Unlike the metallic nanoparticles which decays over distances tens nanometers, display long range at hundreds nanometers for properly selected metal/wavelength combinations. Such drastically changes symmetry charge distribution around as is evidenced nonlinear optical response medium. show that when strongly coupled, equilateral triangular lose their individual to adopt lower coupled...
A systematic study of the influence excitation angle, light polarization and coating thickness commercial SPM tips on field enhancement in an apertureless scanning near-field optical microscope is presented. new method to optimize alignment electric vector along major tip axis by measuring resonance frequency was developed. The simulations were performed with a MNPBEM toolbox based Boundary Element Method (BEM). investigated for first time. Coatings below 40 nm showed drastic both wavelength...
Echo is a fundamental phenomenon observed in both nature and scientific techniques such as magnetic resonance imaging. Now, researchers demonstrate new echo phenomena the orientation of CO${}_{2}$ N${}_{2}$O molecules excited by femtosecond lasers.
Rotational dynamics of D_{2} molecules inside helium nanodroplets is induced by a moderately intense femtosecond pump pulse and measured as function time recording the yield HeD^{+} ions, created through strong-field dissociative ionization with delayed probe pulse. The oscillates period 185 fs, reflecting field-free rotational wave packet dynamics, oscillation persists for more than 500 periods. Within experimental uncertainty, constant B_{He} in-droplet molecule, determined Fourier...
Ultrashort laser pulses carrying orbital angular momentum (OAM) have become essential tools in Atomic, Molecular, and Optical (AMO) studies, particularly for investigating strong-field light-matter interactions. However, controlling generating ultrashort vortex presents significant challenges, since their broad spectral content complicates manipulation with conventional optical elements, while the high peak power inherent short-duration risks damaging components. Here, we introduce a novel...