T. S. Luk

Center for Integrated Nanotechnologies

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K. Boyer

University of Illinois Chicago

C. K. Rhodes

Rocky Mountain Research Station

A. McPherson

Sandia National Laboratories

I. A. McIntyre

University of Illinois System

Ulrich Johann

Airbus (Germany)

C. K. Rhodes

University of Illinois Chicago

Hernán Jara

University of Tennessee Health Science Center

H. Egger

University of Zurich

J. C. Solem

University of Illinois Chicago

H. Pummer

Coherent (United States)

Cooperative Institutions

The University of Tokyo

Kyoto University

Osaka University

Nagoya University

Tohoku University

Centre National de la Recherche Scientifique

Sandia National Laboratories

University of Illinois Chicago

Sandia National Laboratories California

Institut National de Physique Nucléaire et de Physique des Particules

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Evidence of atomic inner-shell excitation in xenon from electron spectra produced by collision-free multiphoton processes at 193 nm

Conference on Lasers and Electro-Optics (1985)

Ulrich Johann T. S. Luk H. Egger H. Pummer C. K. Rhodes

Electron excitation

Electron shell

10.1364/cleo.1985.tha2

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Photonic crystal assisted high-efficiency thermal photovoltaic generation

Ihab El-Kady Christopher S. Murray T. S. Luk Robert Koudelka J. G. Fleming

We present a detailed theoretical and experimental analysis of a novel thermal photovoltaic generation scheme based on the use of radioisotope heating of a metallic photonic crystal emitter. A two-fold TPV-device enhancement efficiency is observed.

Thermophotovoltaic

10.1109/cleo.2006.4628278

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Citations (1)

Studies on UV filaments in air

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2000)

Jens Schwarz Patrick K. Rambo Jean‐Claude Diels T. S. Luk Aaron Bernstein

Summary form only given. There have been numerous observations of filaments at 800 nm. The general perception is that, above a critical power, the beam focuses because nonlinear self-lensing overcomes diffraction. The self-focusing proceeds until an opposing higher order nonlinearity forms a stable balance.

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Multiphoton Excitation and Ionization of Atoms

Hernán Jara Ulrich Johann T. S. Luk I. A. McIntyre A. McPherson

It has been conjectured that atomic motions fundamentally different from those presently observed may be driven under extreme conditions of irradiation. Indeed, it has been suggested 1-4 that ordered many-electron motions of outer-shell electrons could lead to enhanced rates of coupling from the radiation field to an atom. In order to study the conditions necessary for new atomic responses to occur and to determine the influence of possible damping mechanisms, the properties of ion charge state distributions, 5 electron energy spectra, 6 and harmonic radiation 7 produced by irradiation of atoms with ultra-violet radiation with different pulse lengths, wavelengths, and intensities have been investigated.

Energetic neutral atom

Electron excitation

10.1364/mea.1986.wa1

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Multiphoton induced x-ray emission from Kr clusters onM-shell (∼100 Å) andL-shell (∼6 Å) transitions

Physical Review Letters (1994)

A. McPherson T. S. Luk B. D. Thompson A. Borisov O. B. Shiryaev

Experiments demonstrating the role of cluster formation on multiphoton-induced x-ray emission and the scaling of this phenomenon into the kilovolt range have been performed on Kr. For the Kr M shell, augmentation of ${\mathrm{Kr}}_{\mathit{n}}$ formation leads to a large increase in ${\mathrm{Kr}}^{9+}$ (4p\ensuremath{\rightarrow}3d) emission (\ensuremath{\sim}100 \AA{}) and the appearance of a strong band at \ensuremath{\sim}90 \AA{}. The observation of L-shell transitions (\ensuremath{\sim}5--7.5 \AA{}) demonstrates the scaling of this phenomenon into the kilovolt region and leads to the conclusion that the interaction produces direct inner-shell excitation with the emission of prompt x rays.

Electron shell

10.1103/physrevlett.72.1810

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Citations (174)

Relativistic and charge-displacement self-channeling of intense ultrashort laser pulses in plasmas

Physical Review A (1992)

A. Borisov A. V. Borovskiy O. B. Shiryaev V. V. Korobkin A. M. Prokhorov

A simple derivation in the Coulomb gauge of the nonlinear Schr\"odinger equation describing propagation of powerful ultrashort circularly polarized laser pulses in underdense cold inhomogeneous plasmas is presented. Numerical solutions are given for the two-dimensional axisymmetric case for both initially homogeneous plasmas and static preformed plasma columns. These solutions account for (i) diffraction, (ii) refraction arising from variations in the refractive index due to the spatial profile of the electron density distribution, (iii) the relativistic electronic mass shift, and (iv) the charge displacement resulting from the transverse ponderomotive force. The most important spatial modes of propagation corresponding to (1) purely relativistic focusing and (2) the combined action of both the relativistic and charge-displacement mechanisms are described. The latter leads to the formation of stable confined modes of propagation having paraxially localized regions of high intensity and corresponding paraxially situated cavitated channels in the electron density. It is further demonstrated that the dynamical solutions of the propagation tend asymptotically to the lowest eigenmodes of the governing nonlinear Schr\"odinger equation. Finally, the calculations illustrate the dynamics of the propagation and show that the relativistic mechanism promotes the initial concentration of the radiative energy and that the subsequent charge displacement stabilizes this confinement and produces waveguidelike channels.

Relativistic plasma

Charge density

10.1103/physreva.45.5830

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Citations (292)

Charge-Displacement Self-Channeling as a Method for Energy Concentration

K. Boyer T. S. Luk J. C. Solem C. K. Rhodes

The concentration of energy arising from charge–displacement self–channeling is discussed. Since high energy deposition rates are expected to arise from multiphoton coupling and the channel can also serve as an effective waveguide for secondary radiation, such circumstances are Ideal for generating coherent short wavelength radiation.

Waveguide

10.1364/swcr.1988.hilim233

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All-Optical Switching of an Epsilon-Near-Zero Plasmon in ITO

Research Square (Research Square) (2020)

Justus Bohn T. S. Luk Craig Tollerton S. Hutchins Igal Brener

Abstract Nonlinear optical devices and their implementation into modern nanophotonic architectures are constrained by their usually moderate nonlinear response. Recently, epsilon-near-zero (ENZ) materials have been found to have a strong optical nonlinearity, which can be enhanced through the use of cavities or nano-structuring. Here, we study the pump dependent properties of the plasmon resonance in the ENZ region in a thin layer of thin indium tin oxide (ITO). Exciting this mode using the Kretschmann-Raether configuration, we study reflection switching properties of a 60nm layer close to the resonant plasmon frequency. We demonstrate the thermal switching mechanism, which results in a shift in the plasmon resonance frequency of 20THz for a TM pump intensity of 75GW/cm 2 . For degenerate pump and probe frequencies, we highlight an additional coherent contribution, not previously isolated in ENZ nonlinear optics studies, which leads to an overall pump induced change in reflection from 1% to 45%.

Indium tin oxide

Nanophotonics

10.21203/rs.3.rs-40947/v1

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Limiting cross sections for multiphoton coupling

Revue de Physique Appliquée (1987)

K. Boyer Hernán Jara T. S. Luk I. A. McIntyre A. McPherson

published or not.The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

Limiting

10.1051/rphysap:0198700220120179300

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Citations (14)

Measurements of ion and electron dynamics in multiphoton ionization of molecules (A)

Journal of the Optical Society of America B (1987)

T. S. Luk K. Boyer C. K. Rhodes

Dynamics

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