Jacek Swiatkiewicz

South Dakota School of Mines and Technology

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Paras N. Prasad

University at Buffalo, State University of New York

Yuzhen Shen

Shandong First Medical University

Jan A. Puszynski

South Dakota School of Mines and Technology

Guang S. He

University at Buffalo, State University of New York

Marek Samoć

Wrocław University of Science and Technology

Bruce A. Reinhardt

United States Air Force Research Laboratory

Maciek E. Orczyk

University at Buffalo, State University of New York

Daniel Jakubczyk

Polish Academy of Sciences

Pratibha Chopra

University at Buffalo, State University of New York

Christopher S. Friend

The Ohio State University

Cooperative Institutions

University at Buffalo, State University of New York

Oak Ridge National Laboratory

Arizona State University

Buffalo State University

California State University, Fresno

European Space Research and Technology Centre

Advanced Imaging Research (United States)

Hitachi (Japan)

Australian National University

South Dakota School of Mines and Technology

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Third order nonlinear optical interactions in thin films of poly-p-phenylenebenzobisthiazole polymer investigated by picosecond and subpicosecond degenerate four wave mixing

Applied Physics Letters (1986)

D. Narayana Rao Jacek Swiatkiewicz Pratibha Chopra Suniti K. Ghoshal Paras N. Prasad

The third order nonlinear optical susceptibility has been measured by degenerate four wave mixing in a 33-μm-thick biaxial film of a conjugated aromatic heterocyclic polymer, poly-p-phenylenebenzobisthiazole, commonly known as PBT, which has a very high mechanical strength due to its rigid rod conformation as well as environmental stability and a high laser damage threshold. For the first time, the response of the optical nonlinearity in the π-electron conjugated system has been experimentally verified to be in subpicoseconds. The value of χ(3) is found to be about an order of magnitude larger than that of CS2. The measurement at two different wavelengths suggests that they are nonresonant χ(3) values. The measured anisotropy of χ(3) as a function of angular orientation at two different sets of laser polarization is explained by using the tensor properties of χ(3) in an anisotropic medium.

Picosecond

Four-wave mixing

10.1063/1.96464

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Citations (110)

Metal Acetylides for Nonlinear Optics

Marie P. Cifuentes David C. R. Hockless Mark G. Humphrey Stephan Houbrechts Barry Luther‐Davies

10.25911/5d6903fb9a318

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Organic and Organic-inorganic Hybrid Materials for Nanophotonics: Nanoscale Optical Science and Technology

Paras N. Prasad Manjari Lal Christopher S. Friend Abani Biswas Jacek Swiatkiewicz

Nanophotonics

Optical materials

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<title>Optically induced nonlinearities in fullerenes and fullerene-doped polymeric composites</title>

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (1994)

Paras N. Prasad Guolin Huang Maciek E. Orczyk Jacek Swiatkiewicz Jaroslaw Zieba

We describe the results of the investigations of optical nonlinearities in fullerenes in various forms, ranging from solutions to composites devised in device-oriented forms. Two types of optically-induced nonlinearities are of great interest here: third-order nonlinearity and photorefractivity. The third-order nonlinearity has been investigated by a combination of photoinduced transient absorption and optical Kerr gate, using femtosecond pulses at 615 nm and 796 nm. Specially useful here is the new technique of femtosecond phase-tuned optically heterodyned Kerr gate by which we have measured both the signs and the magnitudes of the real and the imaginary components of (chi) ⁽³). This information is very useful in understanding the roles of one- and two-photon resonances. Another application of fullerenes is in polymeric photorefractivity which is derived from a combination of optically induced space-charge field and the electro-optic effect. Exceptionally rapid progress has been recently witnessed in the development of polymeric photorefractive materials which now exhibit parameters of merit comparable or surpassing best inorganic photorefractives. We have devised polymer composite with C₆₀ as the photosensitizer to produce highly efficient photorefractive materials. The dynamic and the kinetic aspects of the photorefractive process in the polymer composite have been investigated.

Figure of Merit

10.1117/12.196124

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Citations (1)

Two-Photon Absorption and Excited-State Energy-Transfer Properties of a New Multibranched Molecule

Chemistry of Materials (2001)

Seung Joon Chung Tzu‐Chau Lin K. S. Kim Guang S. He Jacek Swiatkiewicz

This paper presents a molecular design for a two-photon absorbing structure, which contains a two-dimensional molecular architecture with four arms and one bridging unit, each of these segments having an extended π-conjugation and capable of producing two-photon absorption in different spectral ranges. Two chromophore units of a triphenylamine derivative dye, (N, N-di[4-{4-(5-[4-tert-butylphenyl]-1,3,4-oxadiazol-2-yl)styryl}phenyl]amino)benzene, were linked with a π-conjugated di-2-thienylethenylene bridging unit to form a new multibranched compound, bis(5-[4-{N,N-di(4-[4-{5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl}styryl]phenyl)amino}styryl]thien-2-yl)ethenylene. Linear absorption spectra and luminescence spectra of the component and the multibranched chromophores revealed a hypochromic effect for the multibranched dye. A very effective energy transfer from the excited arm units to the π-conjugated bridging unit is observed. The two-photon cross-sections were measured using the femtosecond Z-scan technique at several excitation wavelengths in the 620−800 nm range. Comparing the nonlinear absorption coefficients observed for the constituent chromophore dyes with that for the multibranched compound, we found that the arm units make the dominant contribution to the two-photon absorption when the wavelength of excitation is longer than 720 nm.

Chromophore

Triphenylamine

Two-Photon Absorption

10.1021/cm010151g

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Citations (142)

Laser-induced breakdown spectroscopy of nanopowders andpowder mixtures.

Jacek Swiatkiewicz Lisa R. Brown Jan A. Puszynski

Laser-induced breakdown spectroscopy was applied for determining of aluminum and vanadium content in the V2O5- Ti02 and A1-Ti02 nanopowder mixtures and, for monitoring of silane release from silane coated aluminum nanopowder into the solvent.

Laser-induced breakdown spectroscopy

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Anisotropy in the complex refractive index and the third-order nonlinear optical susceptibility of a stretch-oriented film of poly(p-phenylene vinylene)

Journal of Applied Physics (1993)

Jacek Swiatkiewicz Paras N. Prasad Frank E. Karasz

Birefringence, dichroism, and dispersion of the refractive indices of a free-standing film of poly(p-phenylene vinylene) (PPV) were measured by several techniques. The results are applied to an analysis of anisotropy of the third-order nonlinear optical susceptibility of this material. The anisotropy of both the linear and nonlinear susceptibilities is accounted for by the one-dimensional character of the lowest-energy electronic transition in PPV.

Optical anisotropy

Dichroism

10.1063/1.355264

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Citations (25)

Dynamics of Reactions in molecular Solids

Molecular crystals and liquid crystals (1983)

Paras N. Prasad Jacek Swiatkiewicz

Abstract The dynamics of several thermal and photochemical reactions in the solid-state are investigated by laser Raman spectroscopy, electronic spectroscopy and a rigid-body motion analysis of the thermal parameters of x-ray diffraction studies. Raman phonon spectroscopy along with electronic emission spectroscopy is used to identify the reaction mechanism. The possibility of occurence of any lattice and/or molecular intermediate is examined, by Raman spectroscopy of both phonons and intramolecular vibrations. The new concept of phonon-assisted reaction is tested by examining the role of an overdamped oscillation in a thermal reaction and that of a strong electron-phonon coupling in a photochemical reaction.

Reaction dynamics

Electron spectroscopy

10.1080/00268948308073513

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Citations (13)

ChemInform Abstract: SPECTROSCOPIC STUDIES OF THE THERMAL REARRANGEMENT REACTION OF DIMETHYL 3,6‐DICHLORO‐2,5‐DIHYDROXYTEREPHTHALATE IN THE SOLID STATE

Chemischer Informationsdienst (1983)

Jacek Swiatkiewicz Paras N. Prasad

Abstract Das gelbe Terephthalat (I) wandelt sich (als Kristall) bei etwa 120‐140°C in die weiße Modifikation (II) um.

10.1002/chin.198311054

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Anisotropy of the linear and third-order nonlinear optical properties of a stretch-oriented polymer film of poly-[2, 5-dimethoxy paraphenylenevinylene]

Applied Physics Letters (1990)

Jacek Swiatkiewicz Paras N. Prasad Frank E. Karasz Mark A. Druy Paul J. Glatkowski

Large linear refractive index birefringence, strong dichroic behavior, and highly anisotropic χ(3) have been observed for a uniaxially oriented poly (2, 5-dimethoxy paraphenylene vinylene) film. A subpicosecond time-resolved degenerate four-wave mixing study reveals an unusual behavior. Along the draw direction χ(3) is complex with a negative real part and has a response time that is longer than the optical pulse resolution. In contrast, χ(3) along the transverse direction is largely real and positive. Its response time is much faster, and is limited by the laser pulse width of ∼400 fs.

Dichroic glass

10.1063/1.102620

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Citations (44)