Laminated waveguiding polarizer utilizing polymeric birefringent cladding

• US 5,202,938 A
• Filed: 11/25/1991
• Issued: 04/13/1993
• Est. Priority Date: 11/25/1991
• Status: Expired due to Term

• Current Assignee: Corning Incorporated
• Original Assignee: Hoechst Celanese Corporation (Sanofi )
• Inventors: Oba, Kazutaka, Man, Hong-Tai, Teja, Joseph Jr.
• Primary Examiner(s): Lee, John D.
• Assistant Examiner(s): BARNS, STEPHEN
• Application Number:
  US07/796,731
• Time in Patent Office: 505 Days
• Field of Search: 385/11, 385/130, 385/132, 385/142, 385/143, 385/144, 385/145, 385/37, 359/500, 359/494, 359/63
• US Class Current: 385/11
• CPC Class Codes: G02B 6/126 using polarisation effects G02B6/1226 takes precedence

Abstract

A waveguiding polarizer utilizing a birefringent polymer film cladding layer is disclosed and claimed. The cladding layer may be a spin-coated polyimide, polyarylate, polyaramide or like polymer. Core and cladding layers are selected so that waveguiding conditions are achieved for light of predetermined polarity, for example, a transverse magnetic mode only.

Claims

1. A laminated waveguiding polarizer for emitting linearly polarized light upon irradiation with a light beam of arbitrary polarization comprising in combination a waveguide core layer which is substantially optically transparent adjacent a birefringent polymer film cladding layer, the refractive indices of said core layer and said cladding layer being selected so that the layers of the polarizer will cooperate to selectively guide light of a predetermined linear polarization and extinguish polarization components orthagonal thereto wherein said core layer is formed of a polymer having sidechains with a dipole moment such that the core material changes its refractive properties upon poling in an electric field at the vicinity of the glass transition temperature of the polymer.

2. The polarizer according to claim 1, wherein the polarizer selectively guides light linearly polarized in a direction perpendicular to the birefringent cladding layer film surface.

3. The polarizer according to claim 1, wherein the polarizer selectively guides light linearly polarized in a direction parallel to the birefringent cladding layer film surface.

4. The polarizer according to claim 1, wherein the birefringent cladding layer is produced by spin coating a polymer solution onto the surface of a substrate.

5. The polarizer according to claim 4, wherein the birefringent cladding layer is formed from an aromatic polymer.

6. The polarizer according to claim 1, wherein the birefringent cladding layer is formed of an aromatic polymer.

7. The polarizer according to claim 6, wherein the birefringent cladding layer is formed from a polymer selected from the group consisting of aromatic polyimides and polyarylates.

9. The polarizer according to claim 1, wherein the sidechains of said core layer polymer are nitroazobenzene sidechains.

10. The polarizer according to claim 1, wherein the sidechains of said core layer polymer are nitrostilbene sidechains.

11. The polarizer according to claim 1, wherein the sidechains of said core layer polymer include a conjugated .sup.[ electron system.

12. The polarizer according to claim 1, wherein said birefringent film exhibits a birefringence of at least about 0.005.

13. The polarizer according to claim 1, wherein said birefringent film exhibits a birefringence of at least about 0.0075.

14. The polarizer according to claim 1, wherein said birefringent film exhibits a birefringence of at least about 0.01.

8. The polarizer according to claim i, wherein the birefringent cladding layer is formed from a polymer selected from the group consisting of:

aromatic polyamides, polyamide-imides, polybenzimidazoles, polybenzoxazoles, aromatic polyesters, polyetherimides, polyetherketones, polyethersulfones, polyimidesulfones, and polysulfones.