1,721,002 research outputs found
Observation of Lateral Displacement of An Optical Beam Enhanced By Surface-plasmon Excitation
No full textExperimental Investigation of Lateral Wave Contribution To the Shift of A Reflected Beam At Surface-plasmon Resonance
No full textFAST INTEGRATED ELECTRO-OPTICAL SWITCH AND BEAM DEFLECTOR BASED ON NEMATIC LIQUID CRYSTAL WAVEGUIDES
No full textThermally-induced Optical Bistability In A New Polymeric Blend At Room-temperature
No full textThe transition from the transmission to the reflection regime for an Ar+-laser beam propagating in the new polymeric blend PMMA-EVA at a nonlinear interface has been observed. A comparison between the experimental data and a calculation of the input optical intensity at which this transition should occur (1.45 x 10(7) W m-2) is presented using Kaplan's theory. The results suggest the presence of thermally induced optical bistability in PMMA-EVA
Optical bistability by nonlinear reflection in a polymeric blend
No full textWe have analysed the propagation of two continuous-wave Ar+-laser beams travelling in opposite directions in a two-component nonlinear heterogeneous medium (the polymeric blend PMMA-EVA), in a mirror retroreflection geometry. Bistable ref-lection associated with the laser-induced suppression of scattering is observed. This phenomenon has a thermal origin. Based on light- and heat-transport theory inside the material, a simplified explanation of the experimental evidence is presented, showing the conditions for the onset of optical bistability. Qualitative agreement with our experimental results is found
Comparison of the thermo- and electro-optical properties of doped and un-doped MOM based PDLCs
No full textExperiments on the thermo- and electro-optical behavior of pure polymer dispersed liquid crystal (NOA-PDLC) film
and new type of metallomesogen based PDLC (MOM-PDLC) film are presented. The NOA-PDLC film and the MOMPDLC
film consisted of the droplets of nematic LC (E7) up to a 40% weight fraction in a NOA resin matrix, respectively.
The samples were prepared by putting the PDLC solutions into the Indium Tin Oxide (ITO)-coated glass
cells and UV-curing process. The electro-optical properties of the NOA-PDLC films and MOM-PDLC films were
studied under the conditions of an externally applied square wave electric field (2–11 V/lm) and a film thickness (30–50
lm) with an argon laser (wavelength 514 nm), respectively. The experimental results are compared for two kinds of
PDLC films. The electro-optical effects showed promising switching times with a rise time of 1 ms and a decay time of 3
ms and an exceptionally high contrast ratio up to 800 for MOM-PDLC sample. These results demonstrate the validity
of employing this new type of MOM-PDLC in electro-optical devices
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
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