130 research outputs found
Corrigendum to: “Nonlocal effects in the optical response of composite materials with metallic nanoparticles” [Solid State Commun. 133 (2005) 315-320]
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Nonlocal effects in the optical response of composite materials with metallic nanoparticles
No full textPortrait of Louis Nowra, author, leaning on a railing, 1981 [picture] /
No full textTitle devised by cataloguer from inscription.; Part of the collection: Portraits of Louis Nowra, author, 1981.; Inscriptions: "Louis Nowra 5/2/81, H de Berg"--In ink on verso of print.; Condition: Soiled, scratched.; Also available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-vn4728382
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Instability and chaos of counterpropagating beams in a nonlinear medium.
No full textThe dynamical behavior of counterpropagating light waves interacting with a nonlinear medium is studied numerically. It is found that the wave and the medium form a system that becomes unstable under certain conditions and exhibits self-oscillation. Because the interacting medium is modeled by an ensemble of two-level systems, we recognize the self-oscillation frequency as the Rabi-frequency of the constituent systems. The physical mechanisms responsible for this self-oscillation are the gain and the distributed feedback of the combined lightwave-medium system. When the environment changes, in particular when the intensity is increased, this system becomes more unstable and we find that the oscillation exhibits more complex behavior, including quasi-periodic motion and chaos. We analyze the output fields by using Fourier spectra, phase portraits, and autocorrelation functions. In the chaotic regime, the Lyapunov exponents and dimensions are also calculated. A physical interpretation of the quasiperiodic motion is given by an exact calculation of the absorption spectrum of our two-level medium. The negative absorption (gain) peaks are found at the frequencies of the quasi-periodic motions, thus implying that the gain of the combined light-medium system is responsible at least in part for the observed complex behavior. In addition, we investigate the stability of the propagating plane wave when a transverse wave is added to the system as a perturbation. Instabilities are analyzed by linearizing the nonlinear equations which model the lightwave-medium system. The results show that the instability is highly-correlated with the four-wave mixing phase conjugation.Digitization Note: p.20 missing from paper original and microfilm version
Optical Properties of a Molecule on the Surface of a Metallic Nanosphere in Strong Coupling Limit
No full textJudith Cohen, art historian and author of Cowtown Moderne
No full textAuthor and art historian Judith (Judy) Cohen sits on a reproduction Le Corbusier chaise from her personal collection of Art Deco style pieces. The railing seen behind her is made from a decorative grill from the restaurant in the Striplings building and the grate on the wall in the background is from the Aviation Building, which was located at Seventh and Main streets. She is the author of the book Cowtown Moderne.https://mavmatrix.uta.edu/specialcollections_startelegram1990s/1123/thumbnail.jp
Nonlocal effects on optical and molecular interactions with metallic nanoshells
Full text linkTheoretical studies of the optical response of metallic nanoshells have been carried out, where quantum effects are partially accounted for through the application of a nonlocal response model for shells of mesoscopic dimensions. Both far field and near field interactions are considered, with the incident source being a plane wave and an emitting molecular dipole, respectively. It is found that these nonlocal effects can lead to significant deviations from macroscopic electrodynamic theory, for shells of ultrasmall dimensions (nm) or ultrathin thickness (~1 nm), and are particularly significant for processes involving higher multipolar responses of the nanoshells. It is further concluded that these effects can still be observable, even in the presence of possibly large interfacial scattering for the free electrons in these nanoshells
Judith Cohen, art historian and author of Cowtown Moderne
No full textAuthor and art historian Judith (Judy) Cohen sits on a reproduction Le Corbusier chaise from her personal collection of Art Deco style pieces. The railing seen behind her is made from a decorative grill from the restaurant in the Striplings building and the grate on the wall in the background is from the Aviation Building, which was located at Seventh and Main streets. She is seen holding her book Cowtown Moderne in her lap.https://mavmatrix.uta.edu/specialcollections_startelegram1990s/1122/thumbnail.jp
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