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AN ORGANIC MULTILAYER ANISOTROPIC WAVEGUIDE FOR NONLINEAR OPTICAL APPLICATIONS

IP.com Disclosure Number: IPCOM000025566D
Original Publication Date: 1986-Apr-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 6 page(s) / 222K

Publishing Venue

Xerox Disclosure Journal

Abstract

New nonlinear optical materials for waveguides are needed to enhance the ability of the waveguides to perform electro-optic tasks. It has been particularly difficult to obtain bulk materials with large second order nonlinear susceptibilities. This difficulty arises from the fact that many hrghly nonlinear materials form centrosymmetric crystals yielding no second order susceptibility. In structures where the vector direction of highly nonlinear molecules have projections on the same external reference frame, the effective nonlinearity of all the molecules can result in a high bulk nonlinearity, If this material can be fabricated into a waveguide, high laser power densities can be maintained over long path lengths further enhancing the efficiency of the nonlinear interaction such as frequency doubling and parametric mixing.

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Page 1 of 6

XEROX DISCLOSURE JOURNAL

AN ORGANIC MULTILAYER ANISOTROPIC WAVEGUIDE FOR NONLINEAR OPTICAL APPLICATIONS Int. Ci. G02b 6/00 John R. Andrews

Proposed Classification
U.S. CI. 350/96

16 17 79

FIG. I

FUNOAM ENTAL PAOPERTIES OF DYE STRUCTURE

FIG. 2

Volume 11 Number 2 March/April 1986 67

[This page contains 1 picture or other non-text object]

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AN ORGANIC MULTILAYER ANISOTROPIC WAVEGUIDE FOR NONLINEAR
OPTICAL APPLICATIONS [Contld)

68

EXAMPLES

I

I I N

H

CH2

Cd

2

Cd

2

Cd

2 - CH - CH2

I I

0

I
I I I

I xi xz

0 0

0 =c

NH

i

iCH2)m

I

CH3

NG.3

[This page contains 1 picture or other non-text object]

Page 3 of 6

AN ORGANIC MULTILAYER ANISOTROPIC WAVEGUIDE FOR NONLINEAR OPTICAL APPLICATIONS (Cont'd)

12

10 1

FIG. 4

  XEROX DISCLOSURE JOURNAL Volume 11 Number 2 March/April 1986 69

[This page contains 1 picture or other non-text object]

Page 4 of 6

AN ORGANIC MULTILAYER ANISOTROPIC WAVEGUIDE FOR NONLINEAR OPTICAL APPLICATIONS (Cont'd)

New nonlinear optical materials for waveguides are needed to enhance the ability of the waveguides to perform electro-optic tasks. It has been particularly difficult to obtain bulk materials with large second order nonlinear susceptibilities. This difficulty arises from the fact that many hrghly nonlinear materials form centrosymmetric crystals yielding no second order susceptibility. In structures where the vector direction of highly nonlinear molecules have projections on the same external reference frame, the effective nonlinearity of all the molecules can result in a high bulk nonlinearity, If this material can be fabricated into a waveguide, high laser power densities can be maintained over long path lengths further enhancing the efficiency of the nonlinear interaction such as frequency doubling and parametric mixing.

Presented herein is a method of fabricating a waveguide which consists of detergent molecules, some or all of which contain covalent bonds to molecules with a high second order nonlinear susceptibility. The method involves preparing two different types of detergent monolayer over water in a Langrnuir-Blodgett trough. One of these monolayers consists of detergent molecules containing a covalently attached nonlinear moiety with the vector direction of its second order nonlinearity having a large projection on the long axis of the detergent. The second monoIayer is either detergent with no highly nonlinear moiety attached or containing a nonlinear moiety which has a large projection of its second order nonlinearity on the long axis of the detergent. The vector direction of this nonlinearity is opposite that of the first detergent monolayer, Single monolayers of each detergent are stacked one upon another alternately from the two different troughs by extracting the substrate from one trough and dipping into the other trough in the standard manner. Each monolayer could consist of a mixture of detergents to enhance certain properties such a5 layer thickness, stability, ionic charge, fluidity or crysta...