Yeda Research and Develpment & Co. Ltd

Northwestern University

Yeda Research and Development Co. Ltd. at the Weizmann Institute of

Shlomo Yitzchaik

Valeri A Krongauz

Frida Buchhultz

Alexander Zelichenok

Tobin Jay Marks

Garry Berkovic

Schlomo Yitzchaik

Paul M Lundquist

One manner of construction of robust, thin film materials with large second-order optical nonlinearities is the covalent self-assembly of aligned arrays of high-.beta. molecular chromophores into multilayer superlattices. the dispersion of the large second harmonic generation (SHG) response in a self-assembled (SA) film containing stilbazolium chromophore building blocks is disclosed, as well as the fabrication of SHG waveguides with such materials.

Self-assembled superlattices and waveguides prepared for use therewith

A method of making a photochromic polysiloxane includes the steps of forming a photochromic spironaphthooxazine monomer including an alkene terminated side and, by addition reaction, covalently bonding the alkene carbon to [SiH] moieties of a siloxane polymer. Novel spironaphthooxazine monomers and photochromic polysiloxanes are disclosed.

Photochromic spirooxazine monomers and polysiloxanes

Method for the generation of second order nonlinear optical effects, including second harmonic generation, which comprises the steps of: i preparing a material in an xy planar film or xyz tridimensional form on a substrate and placing parallel electrodes on top of, inside, above or below said material, such that there is no protrusion of said electrodes into said material or a protrusion of at least one of said electrodes into said material is thinner than said material, wherein said material comprises at least one species of a hyperpolarizable component (a) and at least one species of a glass-forming organic material (b) providing a non-crystalline solid matrix in which molecules are not mobile, said components (a) and (b) being either distinct species or portions of a bifunctional molecule; ii subjecting said material of step (i) to an electric field essentially along the x-axis thereof; and iii directing a beam of light to impinge on and to be transmitted through said material treated as in step (ii), thus generating second order nonlinear optical effects which are characterized by one or more X.sup.(2) components whose indices are zzz, zxx, zyy and permutations thereof.

Method and system for producing second order nonlinear optical effects

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Evanston, IL, United States of America

Shlomo Yitzchaik