Blazed micro-mechanical light modulator and array thereof

• US 6,618,187 B2
• Filed: 07/11/2001
• Issued: 09/09/2003
• Est. Priority Date: 07/13/2000
• Status: Expired due to Fees

• Current Assignee: Kodak Limited (Eastman Kodak Company)
• Original Assignee: CREO Company Limited
• Inventors: Pilossof, Nissim
• Primary Examiner(s): LESTER, EVELYN A
• Application Number:
  US09/901,728
• Publication Number:
  US 20020021485A1
• Time in Patent Office: 790 Days
• Field of Search: 359/290-292, 359/298, 359/223, 359/224, 359/279, 359/573, 359/295
• US Class Current: 359/295
• CPC Class Codes: G02B 26/0808 by means of one or more diffracting elements
• CPC Class Codes: G02B 5/18 Diffraction gratings holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44
• CPC Class Codes: G02B 5/1828 having means for producing variable diffraction controlling the direction of light by means of one or more diffracting elements G02B26/0808; acousto-optical elements G02F1/11, G02F1/33; electro- or magneto-optical diffraction G02F1/292, G02F1/2955

Abstract

A light valve of deformable grating type and a method for light modulation using the light valves is provided. The light valve of deformable grating type, includes at least three beams, one beam of the at least three beams being of a substantially fixed-position, and at least two beams of the at least three beams being deformable by electrostatic force in a substantially staircase structure, each step of the staircase creating a predefined change in the phase of an impinging light beam, a first electrode and a second electrode, the electrodes transmitting electrostatic force to at least the deformable beams of the at least three beams. The beam of a substantially fixed-position may be deformable by electrostatic force.

Claims

1. A deformable grating light valve, comprising:

at least three beams, one beam of said at least three beams being of a substantially fixed-position, and at least two beams of said at least three beams being deformable by electrostatic force in a substantially staircase structure, each step of said staircase creating a predefined change in the phase of an impinging light beam;

a first electrode and a second electrode, said first and second electrodes transmitting electrostatic force to at least two of said deformable beams of said at least three beams; and

wherein said deformable beams form said first electrode and said second electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said deformable beams.

2. A Spatial light modulator comprising an array of light valves of claim 1.

3. A deformable grating light valve, comprising:

at least three beams, one beam of said at least three beams being of a substantially fixed-position, and at least two beams of said at least three beams being deformable by electrostatic force in a substantially staircase structure, each step of said staircase creating a predefined change in the phase of an impinging light beam;

a first electrode and a second electrode, said first and second electrodes transmitting electrostatic force to at least two of said deformable beams of said at least three beams; and

wherein said beam of a substantially fixed-position is deformable by electrostatic force.

4. The light valve of claim 3, wherein said at least three beams form said first electrode and said second electrode is common to all said deformable beams.

5. A Spatial light modulator formed as an array of light valves of claim 4.

6. The light valve of claim 3, wherein said at least three beams form said first electrode and said second electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams.

7. A Spatial light modulator formed as an array of light valves of claim 6.

8. The light valve of claim 3, wherein said first electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams, and said second electrode is common to all said at least three beams.

9. A Spatial light modulator formed as an array of light valves of claim 8.

10. A Spatial light modulator formed as an array of light valves of claim 3.

11. A deformable grating light valve, comprising:

at least three beams, one beam of said at least three beams being of a substantially fixed-position, and said at least three beams being deformable by electrostatic force in a substantially staircase structure, each step of said staircase creating a predefined change in the phase of an impinging light beam;

a first electrode and a second electrode, said first and second electrodes transmitting electrostatic force to at least two of said deformable beams of said at least three beams; and

wherein said at least three beams form said first electrode and said second electrode is common to all said deformable beams.

12. The light valve of claim 11, wherein said at least three beams form said first electrode and said second electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams.

13. A Spatial light modulator formed as an array of light valves of claim 12.

14. The light valve of claim 11, wherein said first electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams, and said second electrode is common to all said at least three beams.

15. A Spatial light modulator formed as an array of light valves of claim 14.

16. A Spatial light modulator formed as an array of light valves of claim 11.

17. A method for light modulation, comprising the steps of:

providing a deformable grating light valve, said light valve comprising at least three beams, at least the first beam of said at least three beams being of a substantially fixed-position, and at least two beams of said at least three beams being deformable by electrostatic force in a substantially staircase structure, each step of said staircase creating a predefined change in the phase of an impinging light beam;

wherein said deformable grating light valve additionally comprises a first electrode and a second electrode, said first and second electrodes transmitting electrostatic force to at least two of said deformable beams of said at least three beams;

illuminating said light valve;

applying voltage between said first electrode and said second electrode; and

wherein said deformable beams form said first electrode, and said second electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said deformable beams.

18. A method according to claim 17, wherein said beam of a substantially fixed-position is deformable by electrostatic force.

19. A method according to claim 18, wherein all said at least three beams form said first electrode and wherein said second electrode is common to all said at least three beams.

20. A method according to claim 18, wherein said at least three beams form said first electrode and said second electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beam.

21. A method according to claim 18, wherein said first electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams, and said second electrode is common to all said at least three beams.

22. A method for light modulation, comprising the steps of:

providing a deformable grating light valve, said light valve comprising at least three beams, at least the first beam of said at least three beams being of substantially fixed-position, and at least two beams of said at least three beams being deformable by electrostatic force in a substantially staircase structure, each step of said staircase creating a predefined change in the phase of an impinging light beam, wherein said deformable grating light valve additionally comprises a first electrode and a second electrode, said first and second electrodes transmitting electrostatic force to at least two of said deformable beams of said at least three beams;

illuminating said light valve;

applying voltage between said first electrode and said second electrode; and

wherein said first electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said deformable beams, and said second electrode is common to all said deformable beams.

23. A method according to claim 22, wherein said beam of a substantially fixed-position is deformable by electrostatic force.

24. A method according to claim 22, wherein all said at least three beams form said first electrode and wherein said second electrode is common to all said at least three beams.

25. A method according to claim 22, wherein said at least three beams form said first electrode, and said second electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams.

26. A method according to claim 22, wherein said first electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams, and said second electrode is common to all said at least three beams.

27. A method for light modulation, comprising the steps of:

providing a deformable grating light valve, said light valve comprising at least three beams, at least the first beam of said at least three beams being of a substantially fixed-position, and said at least three beams being deformable by electrostatic force in a substantially staircase structure, each step of said staircase creating a predefined change in the phase of an impinging light beam wherein said deformable grating light valve additionally comprises a first electrode and a second electrode, said first and second electrodes transmitting electrostatic force to at least two of said deformable beams of said at least three beams;

illuminating said light valve; and

applying voltage between said first electrode and said second electrode.

28. A method according to claim 27, wherein all said at least three beams form said first electrode and wherein said second electrode is common to all said at least three beams.

29. A method according to claim 27, wherein said at least three beams form said first electrode and said second electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beam.

30. A method according to claim 27, wherein said first electrode comprises an array of electrodes, each electrode of said array of electrodes associated with one of said at least three beams, and said second electrode is common to all said at least three beams.