1,721,009 research outputs found
Optoelectronic router in glass waveguide with a liquid crystal claddingProceedings of SPIE
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Photonics devices based on hybrid approach combining liquid crystals and sol-gel waveguides
No full text25, 175-194 (2006
Tailoring nonlinear nanostructured materials for integrated sources based on stimulated raman scattering
No full textIn this paper, the possibility to obtain new materials with both large Raman gain coefficients and spectral bandwidth is investigated. In particular, silica-niobia based glasses have been characterized by Raman spectroscopy. Our silica-based glass system (K 2 O-Nb 2 O 5 -SiO 2 (KNS)) are obtained by a thermal treatment resulting in a nanocomposite material of easy and cheap production. Our glass composition have demonstrated both a strong Raman gain and a large bandwidth. These results can be related to nanostructured material domains
Toward an ideal nanomaterial for on-chip Raman laser
No full textOne of the most important applications of stimulated Raman scattering (SRS) is the realization
of ampli ̄ers or laser sources in bulk materials, in ̄ber and in integrated optic format as well. We
note that, as a general rule, in all laser gain bulk materials, there is a tradeo® between gain and
bandwidth: line width may be increased at the expense of peak gain. This tradeo® is a fundamental
limitation toward the realization of micro/nano-sources with large emission spectra. In
this paper, in order to clarify the possibility of obtaining new materials with both large Raman
gain coe±cients and spectral bandwidth, SRS investigations in nanostructures, spanning from
nanometrically heterogeneous K2O–Nb2O5SiO2 (KNS) glasses to Si nanocrystals, are reported
and discussed
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
Stimulated Raman scattering in nanostructured materials
No full textNonlinear optics at nanoscale is an intriguing research field of great significance from both fundamental and applicative point of view.In this paper, the phenomena of stimulated Raman scattering in both nanostructured silica based materials and nanostructured silicon based materials are investigated and discussed
Fast integrated electro-optical switch and beam deflector based on nematic liquid crystal waveguides
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