Nonlinear optical structure and methods of making

• US 6,106,948 A
• Filed: 06/06/1997
• Issued: 08/22/2000
• Est. Priority Date: 06/06/1997
• Status: Expired due to Fees

• Current Assignee: University Of Massachusetts
• Original Assignee: University Of Massachusetts
• Inventors: Balasubramanian, Srinivasan, Tripathy, Sukant, Wang, Xiaogong, Li, Lian, Kumar, Jayant
• Primary Examiner(s): Thibodeau, Paul
• Assistant Examiner(s): RICKMAN, HOLLY C
• Application Number:
  US08/870,345
• Time in Patent Office: 1,173 Days
• Field of Search: 428/413, 428/500, 430/281.1, 430/286.1, 430/287.1, 427/162, 427/407.1
• US Class Current: 428/413
• CPC Class Codes: G02F 1/361 Organic materials
• CPC Class Codes: Y10T 428/31511 Of epoxy ether
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers

Abstract

A method for making a multilayer structure having macroscopic second order nonlinear optical properties is described. The resulting nonlinear optical structures made by the method are also described. The method includes the steps of contacting a substrate having ionic adsorption sites with a first charged polyion; ceasing contact of the substrate with the first charged polyion; and thereafter, contacting the substrate with a second charged polyion having a charge opposite to that of the first charged polyion, wherein at least one of the polyions includes a nonlinear optical chromophoric side chain.

Claims

1. A method of making a multilayer structure having macroscopic second order nonlinear optical properties, the method comprising the steps of:

contacting a substrate having ionic adsorption sites with a first charged polyion to form a first layer of the multilayer structure;

ceasing contact of the substrate with the first charged polyion; and

thereafter,

contacting the substrate with a second charged polyion having a charge opposite to that of the first charged polyion to form a second layer of the multilayer substrate, wherein at least one of the polyions comprises nonlinear optical chromophoric side chains that are rod-like mesogens, and wherein the second contacting step causes the side chains to self-align into an ordered arrangement and exhibit macroscopic even-order nonlinear optical properties corresponding to a d33 value of greater than 0.1 pm/V, and wherein at least one of the polyions is formed from a polymer synthesized from an addition reaction of aniline and a compound having two epoxide rings.

2. The method of claim 1, wherein the side chains comprise an azo group.

3. The method of claim 1, wherein the at least one of the polyions is ionized CH-1A-NS.

4. The method of claim 1, wherein the at least one of the polyions is ionized CH-1A-CA.

5. The method of claim 1 wherein the substrate is hydrophilic.

6. The method of claim 1 wherein the substrate is charged.

7. A multilayer structure produced by the method of claim 1.

8. The method of claim 1, further comprising repeating the first contacting, ceasing, and second contacting steps to produce a plurality of oppositely charged bilayers in the multilayer structure.

9. The method of claim 1, wherein the side chains comprise an extended conjugated pi-electron system.

10. A multilayer structure comprising:

a first layer comprising a plurality of polymers having nonlinear optical chromophoric side chains that are rod-like mesogens; and

a second layer comprising a plurality of polymers different from the plurality of polymers in the first layer,

wherein the side chains are oriented to exhibit macroscopic even-order nonlinear optical properties corresponding to a d33 value of greater than 0.1 pm/V, and

wherein the polymers in the first layer are formed from a polymer synthesized from an addition reaction of aniline and a compound having two epoxide rings.

11. The structure of claim 10, wherein the structure has a d₃₃ value of greater than 1.0 pm/V.

12. The structure of claim 10, further comprising a substrate, wherein one of the first layer and second layer is adsorbed onto the substrate.

13. The structure of claim 10, wherein the side chains comprise an azo group.

14. The structure of claim 10, wherein the polymers in the first layer are CH-1A-NS.

15. The structure of claim 10, wherein the polymers in the first layer are CH-1A-CA.

16. The multilayer structure of claim 10 further comprising:

a third layer comprising a plurality of polymers that are the same as those of the first layer; and

a fourth layer comprising a plurality of polymers that are the same as those of the second layer, wherein the third layer is between the second and fourth layers.

17. The structure of claim 16, wherein the structure has a d₃₃ value of greater than 1.0 pm/V.

18. The structure of claim 16, wherein the structure has a d₃₃ value of greater than 10 pm/V.

19. The structure of claim 10, wherein the structure has a d₃₃ value of greater than 10 pm/V.

20. The structure of claim 10, wherein the side chains comprise an extended conjugated pi-electron system.

21. The structure of claim 10, further comprising additional layers.

22. A method of making a multilayer structure having macroscopic second order nonlinear optical properties, the method comprising the steps of:

contacting a substrate having ionic adsorption sites with a first charged polyion to form a first layer of the multilayer structure;

ceasing contact of the substrate with the first charged polyion; and

thereafter,

contacting the substrate with a second charged polyion having a charge opposite to that of the first charged polyion to form a second layer of the multilayer substrate, wherein at least one of the polyions comprises nonlinear optical chromophoric side chains that are rod-like mesogens, and wherein the second contacting step causes the side chains to self-align into an ordered arrangement and exhibit macroscopic even-order nonlinear optical properties corresponding to a d33 value of greater than 0.1 pm/V, and wherein at least one of the polyions is formed from a poly(acrylic acid) copolymer.

23. A multilayer structure comprising:

a first layer comprising a plurality of polymers having nonlinear optical chromophoric side chains that are rod-like mesogens; and

a second layer comprising a plurality of polymers different from the plurality of polymers in the first layer,

wherein the side chains are oriented to exhibit macroscopic even-order nonlinear optical properties corresponding to a d33 value of greater than 0.1 pm/V, and

wherein the polymers in the first layer are formed from a poly(acrylic acid) copolymer.