Accession Number: edselc.2-52.0-33644787901; (Physical Review B - Condensed Matter and Materials Physics, 2006, 73(10)) Publication Type: Academic Journal; Rights: Copyright 2012 Elsevier B.V., All rights reserved.
The g(44) grating is an electroholographic transmission grating in which the applied field is perpendicular to both the grating vector and the wave vector of the incident beam. It is argued that in this configuration the incident beam traverses through a periodically rotating index ellipsoid. It is shown that in the g(44) configuration the Bragg condition is fulfilled for a specific value of the applied field and for a diffracting beam polarization that is perpendicular to that of the incident beam. Consequently, the g(44) grating can be used as an electrically controlled filter. Tunability of 7 nm is demonstrated in a 2mm thick grating.
The authors experimentally and theoretically study the formation of transient two-dimensional photorefractive spatial solitons in a striated paraelectric potassium lithium tantalate niobate crystal. The partial pinning to the built-in slablike index structures activates an interplay between the linear and nonlinear responses that leads to round solitons through a highly symmetric anisotropic nonlinearity, the means to self-write compact undistorted optical circuitry. [ABSTRACT FROM AUTHOR]Copyright of Applied Physics Letters is the property of American Institute of Physics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Accession Number: 23073383; Pierangelo, Angelo 1 DelRe, E. 2 Palange, E. 2; Email Address: palange@ing.univaq.it Ciattoni, A. 3 Garcia, Y. 4 Agranat, A. J. 4; Affiliation: 1: Dipartimento di Fisica, Università di Roma “La Sapienza,” 00185 Roma, Italy 2: Laboratorio di Ottica e Fotonica, Dipartimento di Ingegneria Elettrica e dell’Informazione, Università dell’Aquila, Monteluco di Roio, 67040 L’Aquila, Italy and CNISM, Università dell’Aquila, Monteluco di Roio, 67040 L’Aquila, Italy 3: Consiglio Nazionale delle Ricerche-Laboratorio Regionale CASTI, Università dell’Aquila, 67010 L’Aquila, Italy and Dipartimento di Fisica, Università dell’Aquila, 67010 L’Aquila, Italy 4: Department of Applied Physics, Hebrew University of Jerusalem, Jerusalem 91904, Israel; Source Info: 9/18/2006, Vol. 89 Issue 12, p121123; Subject Term: SOLITONS; Subject Term: LITHIUM niobate; Subject Term: ANISOTROPY; Subject Term: CRYSTALS; Subject Term: CRYSTALLOGRAPHY; Number of Pages: 3p; Illustrations: 2 Black and White Photographs, 1 Graph; Document Type: Article
Waveguide structures were fabricated in potassium lithium tantalate niobate crystals by the implantation of high energy C12 ions. The implantation forms an amorphous layer with a lowered index of refraction within the depth of the crystal, which serves as the cladding of the waveguides. Two amorphous layers were fabricated at 18.8 and 25.6 μm below the surface of the crystal by implantation at 30 and 40 MeV, respectively. This formed a submerged slab waveguide sandwiched between the two amorphous layers and two slab waveguides that were formed between the surface of the crystal and each of the amorphous layers. Coupling between those waveguides was observed and investigated, and confinement of the light in the sandwiched waveguide was demonstrated. © 2006 American Institute of Physics.
