1,721,019 research outputs found
From quantum wires to quantum loops: enhancement of nonlinear optical properties
Get PDFPoster presented at the 2012 Washington State University Academic Showcase.We investigate a system of 1-D quantum wires confined to a plane, as building blocks of quantum loops, to study the role of geometry on their nonlinear optical (NLO) properties.The work was supported by National Science Foundation (NSF) and Wright Patterson Air Force Base. Washington State University, Pullman, WAShafei, Shoresh & kuzyk, Mark G. From quantum wires to quantum loops: enhancement of nonlinear optical properties. Poster presented at the Washington State University Academic Showcase, Pullman, WA
Photo-induced molecular reorientation and photothermal heating as mechanisms of the intensity-dependent refractive index in dye-doped polymers
Get PDFThesis (Ph.D.), Department of Physics and Astronomy, Washington State Universit
Nonlinear-optical studies of organic liquids and polymer optical fibers
Get PDFThesis (Ph.D.), Department of Physics, Washington State Universit
Characterization of molecular excited states for nonlinear optics
Get PDFThesis (Ph.D.), Department of Physics, Washington State Universit
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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Mechanism of self-healing of amplified spontaneous emission in the dye-doped polymer disperse orange 11 dye in PMMA polymer
Get PDFWe study the mechanisms of photodegradation and self-healing of 1-amino-2- methylanthraquinone (Disperse Orange 11) in solid poly(methyl methacrylate) under 532nm Nd:YAG laser excitation as measured by amplified spontaneous emission (ASE). We used photochromism in conjuction with ASE dynamical studies to gain an understanding of the character of species formed during photodegradation. Based on our experiments, we propose the mechanism of dimer formation from dipole coupled tautomers and summarize our results with an energy level diagram that is consistent with the full set of measurements. We use a simple population dynamics model to explain the proposed mechanism. As expected from our proposed mechanisms we find an intensity-dependent photodegradation rate and a constant recovery rate. This understanding can be used to design materials for devices that are more robust against the common problem of photodegradation
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Effect of a thin optical Kerr medium on a Laguerre-Gaussian beam and the applications
Get PDFUsing a generalized Gaussian beam decomposition method we determine the propaga-tion of a Laguerre-Gaussian (LG) beam after it has passed through a thin nonlinear optical Kerr medium. The orbital angular momentum per photon of the beam is found to be conserved while the component beams change. We apply our theory to using LG10beams to measure the nonlinear refractive index coefficient of the medium with high sensitivity, such as the Z-scan and I-scan techniques, and to a new optical limiting geometry. We test the validity of the theory and demonstrate the applications experimentally using a dye-doped polymer, disperse red 1 (DR1) doped poly(methyl methacrylate) (PMMA) (DR1/PMMA). In order to do that, we investigate the mechanisms of the nonlinear refractive index change in DR1/PMMA (trans-cis-trans photoisomerization and photoreorientation) by a three-state model and a holographic volume index gratings recording experiment, and determine the conditions under which DR1/PMMA acts as an optical Kerr medium
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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