Polarizer Films and Methods of Making the Same

• US 20090152748A1
• Filed: 01/16/2009
• Published: 06/18/2009
• Est. Priority Date: 03/17/2006
• Status: Abandoned Application

• Current Assignee: NanoOpto (API Technologies Corporation)
• Original Assignee: API Nanofabrication and Research Corporation
• Inventors: Blonder, Greg E., Wang, Jian Jim
• Application Number:
  US12/355,705
• Publication Number:
  US 20090152748A1
• Time in Patent Office: Days
• US Class Current: 264/1.340
• CPC Class Codes: G02B 5/1809 with pitch less than or comparable to the wavelength
• CPC Class Codes: G02B 5/3025 Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state G02B5/3008, G02B5/3016 take precedence
• CPC Class Codes: G02B 5/3058 comprising electrically conductive elements, e.g. wire grids, conductive particles

Abstract

In general, in one aspect, the invention features methods that include forming a roll of a first material into a substrate and forming a plurality of rows of a second material on the substrate, where the second material includes a metal, the rows of the second material extend along a first direction, the rows are spaced apart from one another, and adjacent rows are spaced apart by about 400 nm or less.

Claims

1. A method, comprising:

forming a roll of a first material into a substrate; and

forming a plurality of rows of a second material on the substrates wherein forming the plurality of rows comprises;

shaping a surface of the substrate to define a plurality of ridges extending along a first direction; and

depositing the second material onto the substrate prior to forming the ridges,

wherein the second material comprises a metal, the rows of the second material extend along the first direction, the rows are spaced apart from one another, and adjacent rows are spaced apart by about 400 nm or less.

2. The method of claim 1, wherein forming the roll into the substrate comprises unwinding the roll to provide the substrate.

4. The method of claim 1, wherein the ridges have a triangular cross-sectional profile.

5. The method of claim 1, wherein the plurality of ridges are formed while the surface of the substrate is at a temperature of about 100°

C. or more.

6. The method of claim 1, wherein the plurality of ridges are formed while the surface of the substrate is at a temperature of about 200°

C. or more.

7. The method of claim 1, wherein the substrate material is a thermoplastic material having a softening temperature, T_S, and the plurality of ridges are formed while the substrate is at a temperature equal to or greater than T_S.

10. The method of claim 1, wherein the deposition forms a continuous layer of the second material and the plurality of rows are formed by forming a plurality of discontinuities in the continuous layer, where the discontinuities extend along the first direction.

12. The method of claim 1, wherein the second material is deposited by evaporating the second material onto the substrate.

13. The method of claim 12, wherein the second material is thermally evaporated.

14. The method of claim 12, wherein the second material is evaporated using an electron beam.

15. The method of claim 1, wherein the second material is deposited by sputtering the second material onto the substrate.

16. The method of claim 1, wherein depositing the second material comprises directing second material towards the substrate along a direction substantially non-normal to a plane of the substrate.

17. The method of claim 1, wherein shaping the surface to define the ridges comprises embossing the surface of the substrate.

25. The method of claim 17, wherein the ridges have a triangular cross-sectional profile, a trapezoidal profile, or a rectangular profile.

26. The method of claim 1, wherein the first material is a polymer.

27. The method of claim 26, wherein the polymer is a thermoplastic.

28. The method of claim 1, wherein the first material is highly transmissive at a wavelength λ

less than about 700 nm.

29. The method of claim 1, wherein the substrate has a thickness of about 500 μ

m or less.

30. The method of claim 1, wherein the metal is aluminum.

31. The method of claim 1, wherein the metal is silver.

32. The method of claim 1, wherein adjacent rows of second material are spaced apart by about 200 nm or less.

33. The method of claim 1, wherein adjacent rows of second material are spaced apart by about 100 nm or less.

34. The method of claim 1, wherein the rows of second material are arranged to form a grating having a period of about 400 nm or less.

35. The method of claim 1, wherein the rows of second material are arranged to form a grating having a period of about 200 nm or less.

36. The method of claim 1, wherein the rows are arranged so to form a polarizer that transmits about 60% or more of incident light at wavelength λ

having a first polarization state and the polarizer blocks about 60% or more of incident light at wavelength λ

having a second polarization state orthogonal to the first polarization state, where λ

is about 200 nm or more.

37. The method of claim 36, wherein λ

is about 2,000 nm or less.

38. The method of claim 36, wherein λ

is about 700 nm or less.

39. The method of claim 1, wherein the polarizer transmits about 80% or more of incident light at wavelength λ

having the first polarization state.

40. The method of claim 1, wherein the polarizer transmits about 90% or more of incident light at wavelength λ

having the first polarization state.

41. The method of claim 1, wherein the polarizer transmits about 95% or more of incident light at wavelength λ

having the first polarization state.

42. The method of claim 1, wherein the polarizer blocks about 80% or more of incident light at wavelength λ

having the second polarization state.

43. The method of claim 1, wherein the polarizer blocks about 90% or more of incident light at wavelength λ

having the second polarization state.

44. The method of claim 1, wherein the polarizer reflects about 60% or more of incident light at wavelength λ

having the second polarization state.

45. The method of claim 1, wherein forming the substrate comprises unwinding the roll and the roll is continuously unwound while the plurality of rows are formed on the substrate.

46. The method of claim 1, further comprising forming one or more additional layers on the substrate.

47. The method of claim 1, further comprising cutting the substrate after forming the plurality of rows to provide a polarizer film product.

54. The method of claim 1, wherein shaping the surface to define the ridges comprises embossing the second material and the surface of the substrate.

55. The method of claim 1, wherein shaping the surface to define the ridges comprises simultaneously embossing the second material and the surface of the substrate.

3. (canceled)

8-9. -9. (canceled)

11. (canceled)

18-24. -24. (canceled)

48. A method, comprising:

forming a roll of a first material into a substrate; and

forming a plurality of rows of a second material on a surface of the substrate,

wherein forming the plurality of rows comprises embossing the second material and the substrate, and

wherein the rows of the second material extend along a first direction, the rows are spaced apart from one another, and arranged so that the rows form a polarizer that transmits about 60% or more of incident light at wavelength λ

having a first polarization state and the polarizer blocks about 60% or more of incident light at wavelength λ

having a second polarization state orthogonal to the first polarization state, where is about 700 nm or less.

49. A method, comprising:

forming a plurality of rows of a first material on a surface of a polymer substrate,

wherein forming the plurality of rows comprises embossing the first material and the substrate, and

wherein the first material comprises a metal, the rows of the first material extend along a first direction, the rows are spaced apart from one another, and adjacent rows are spaced apart by about 400 nm or less.

50. A method, comprising:

forming a plurality of rows of a first material on a surface of a polymer substrate,

wherein forming the plurality of rows comprises embossing the first material and the substrate, and

wherein the rows of the first material extend along a first direction, the rows are spaced apart from one another, and arranged so that the rows form a polarizer that transmits about 60% or more of incident light at wavelength λ

having a first polarization state and the polarizer blocks about 60% or more of incident light at wavelength λ

having a second polarization state orthogonal to the first polarization state, where is about 700 nm or less.

51-53. -53. (canceled)