Photonic modulation of a photonic band gap

• US 8,477,402 B2
• Filed: 09/20/2010
• Issued: 07/02/2013
• Est. Priority Date: 09/20/2010
• Status: Expired due to Fees

• Current Assignee: Enterprise Science Fund, LLC (Intellectual Ventures LLC), MCPU Polymer Engineering, LLC
• Original Assignee: The Invention Science Fund I, L.L.C. (Intellectual Ventures LLC)
• Inventors: Duncan, William David, Hyde, Roderick A., Myhrvold, Nathan P., Tegreene, Clarence T., Weaver, Thomas Allan, Wood, Lowell L. Jr.
• Primary Examiner(s): Martinez, Joseph P
• Application Number:
  US12/924,140
• Publication Number:
  US 20120069417A1
• Time in Patent Office: 1,016 Days
• Field of Search: 359/245, 359/247, 359/288, 359/290, 359/291
• US Class Current: 359/291
• CPC Class Codes: G02B 1/005 made of photonic crystals or photonic band gap materials photonic band-gap structures or photonic lattices in integrated optics G02B6/1225; photonic band-gap structures or photonic lattices in optical fibres G02B6/02295
• CPC Class Codes: G02F 1/0126 Opto-optical modulation, i.e. control of one light beam by another light beam, not otherwise provided for in this subclass
• CPC Class Codes: G02F 1/0147 based on thermo-optic effects G02F1/132 takes precedence
• CPC Class Codes: G02F 2202/32 Photonic crystals

Abstract

An apparatus comprises a first photonic crystal structure having a first photonic band gap distribution and configured to support a first electromagnetic signal, wherein the first photonic band gap distribution may vary according to a second electromagnetic signal.

Claims

1. An apparatus comprising:

a first photonic crystal structure having a first photonic band gap distribution and configured to support a first electromagnetic signal, the first photonic crystal structure including a first thermally responsive material configured to vary dimensionally in response to a second electromagnetic signal different from the first electromagnetic signal; and

wherein the first photonic band gap distribution is configured to vary corresponding to the dimensional variation of the first thermally responsive material.

2. The apparatus of claim 1 wherein the first photonic band gap distribution includes a photonic band gap in at least two dimensions.

3. The apparatus of claim 1 wherein the first photonic band gap distribution includes a photonic band gap in at least three dimensions.

4. The apparatus of claim 1 wherein the first photonic crystal structure includes a photonic crystal fiber.

5. The apparatus of claim 1 wherein the first photonic crystal structure includes a first waveguide.

6. The apparatus of claim 1 wherein the first photonic crystal structure includes a first solid material and a second solid material different from the first material, the first and second materials each having a real dielectric constant greater than 1.

7. The apparatus of claim 1 wherein the first photonic band gap distribution is configured to change reversibly in response to the second electromagnetic signal.

8. The apparatus of claim 1 wherein the first photonic band gap distribution is configured to change irreversibly in response to the second electromagnetic signal.

9. The apparatus of claim 1 wherein the first photonic band gap distribution is configured to change as a function of time.

10. The apparatus of claim 1 wherein the first photonic crystal structure is configured to support a first electromagnetic signal having a first frequency distribution and wherein the first photonic crystal structure is further configured to support a third electromagnetic signal having a third frequency distribution different from the first frequency distribution.

11. The apparatus of claim 1 wherein the first photonic crystal structure is configured to support a first electromagnetic signal having a first frequency distribution and the first thermally responsive material is configured to vary dimensionally in response to the second electromagnetic signal, wherein the second electromagnetic signal has a second frequency distribution different from the first frequency distribution.

12. The apparatus of claim 11 wherein the first frequency distribution has a first center frequency and the second frequency distribution has a second center frequency different from the first center frequency.

13. The apparatus of claim 12 wherein the first center frequency is greater than the second center frequency.

14. The apparatus of claim 12 wherein the first center frequency is less than the second center frequency.

15. The apparatus of claim 1 wherein the first thermally responsive material is further configured to vary dimensionally in response to a third electromagnetic signal different from the first and second electromagnetic signals.

16. The apparatus of claim 1 wherein the first thermally responsive material is configured to vary irreversibly in response to the second electromagnetic signal.

17. The apparatus of claim 1 wherein the supported first electromagnetic signal has a first frequency distribution that is configured to vary according to the varying photonic band gap distribution.

18. The apparatus of claim 1 wherein the supported first electromagnetic signal has a first field distribution that is configured to vary according to the varying photonic band gap distribution.

19. The apparatus of claim 1 wherein the first photonic crystal structure further includes a second thermally responsive material, different from the first thermally responsive material and configured to vary dimensionally in response to a third electromagnetic signal different from the first and second electromagnetic signals.

20. The apparatus of claim 19 wherein the first photonic band gap distribution is configured to vary corresponding to the dimensional variation of the second thermally responsive material.

21. The apparatus of claim 1 wherein the first photonic crystal structure includes a first material having the first photonic band gap distribution, and wherein the first thermally responsive material is integral to the first material.

22. The apparatus of claim 1 wherein the first photonic crystal structure includes a first material having the first photonic band gap distribution, and wherein the first thermally responsive material is arranged proximate to the first material having the first photonic band gap distribution.

23. The apparatus of claim 1 further comprising a sensor configured to detect at least one property of the first electromagnetic signal, wherein the sensor is operably coupled to a device configured to control the second electromagnetic signal.

24. The apparatus of claim 23 wherein the device configured to control the second electromagnetic signal includes an electromagnetic energy generator configured to produce the second electromagnetic signal.

25. The apparatus of claim 23 wherein the device configured to control the second electromagnetic signal includes an optical element configured to interact with the second electromagnetic signal.

26. The apparatus of claim 23 wherein the at least one property of the first electromagnetic signal corresponds to a frequency.

27. The apparatus of claim 23 wherein the at least one property of the first electromagnetic signal corresponds to a field.

28. The apparatus of claim 23 wherein the sensor is operably coupled to circuitry, and wherein the circuitry is operably coupled to the device configured to control the second electromagnetic signal.

29. The apparatus of claim 1 wherein the first photonic band gap distribution is configured to vary between a first state and a second state, wherein the first state corresponds to a first configuration of the second electromagnetic signal and the second state corresponds to a second configuration of the second electromagnetic signal.

30. The apparatus of claim 29 wherein the first configuration of the second electromagnetic signal corresponds to a first frequency of the second electromagnetic signal and the second configuration of the second electromagnetic signal corresponds to a second frequency of the second electromagnetic signal.

31. The apparatus of claim 1 further comprising:

a second photonic crystal structure having a second photonic band gap distribution and configured to support a third electromagnetic signal, the second photonic crystal structure including a second thermally responsive material configured to vary dimensionally in response to a fourth electromagnetic signal different from the third electromagnetic signal; and

wherein the second photonic band gap distribution is configured to vary corresponding to the dimensional variation of the second thermally responsive material.

32. The apparatus of claim 31 wherein the first electromagnetic signal corresponds to the third electromagnetic signal.

33. The apparatus of claim 31 wherein the first electromagnetic signal corresponds to the fourth electromagnetic signal.

34. The apparatus of claim 1 wherein at least a portion of the first electromagnetic signal forms at least a portion of the second electromagnetic signal.

35. The apparatus of claim 1 wherein the first photonic crystal structure is configured to support a first electromagnetic signal having a first polarization that is variable according to the varying photonic band gap distribution.

36. The apparatus of claim 1 wherein the first photonic crystal structure is configured to support a first electromagnetic signal corresponding to a first mode, the first mode having a first amplitude that is variable according to the varying photonic band gap distribution.

37. The apparatus of claim 1 wherein the first photonic crystal structure is configured to output at least a portion of the first electromagnetic signal, and wherein the outputted portion of the first electromagnetic signal forms at least a portion of the second electromagnetic signal.

38. The apparatus of claim 1 further comprising an output electromagnetic signal, wherein at least a portion of the first electromagnetic signal forms at least a portion of the output electromagnetic signal, and wherein the first thermally responsive material is further configured to vary dimensionally in response to at least a portion of the output electromagnetic signal.

39. The apparatus of claim 38 wherein the first thermally responsive material is configured to vary dimensionally in response to at least a portion of the output electromagnetic signal to at least partially counteract the dimensional variation in response to the second electromagnetic signal.

40. A method comprising:

propagating a first electromagnetic signal in a first region having a first photonic band gap distribution;

heating at least a first portion of the first region with a second electromagnetic signal, different from the first electromagnetic signal;

dimensionally varying the first photonic band gap distribution in response to heating at least a first portion of the first region; and

adjusting the propagation of the first electromagnetic signal responsive to dimensionally varying the first photonic band gap distribution.

41. The method of claim 40 wherein adjusting the propagation of the first electromagnetic signal includes:

changing the spectral width of the first electromagnetic signal.

42. The method of claim 40 further comprising:

heating at least a second portion of the first region with a third electromagnetic signal, different from the first and second electromagnetic signals, wherein heating at least a second portion of the first region changes the first photonic band gap distribution.

43. The method of claim 40 further comprising:

propagating a third electromagnetic signal in the first region;

heating at least a second portion of the first region with a fourth electromagnetic signal, wherein heating at least a second portion of the first region changes the first photonic band gap distribution; and

adjusting the propagation of the third electromagnetic signal responsive to the changing the first photonic band gap distribution.

44. The method of claim 43 wherein the first electromagnetic signal has a first frequency distribution and the third electromagnetic signal has a second frequency distribution different from the first frequency distribution.

45. The method of claim 40 wherein the first electromagnetic signal has a first frequency distribution and the second electromagnetic signal has a second frequency distribution different from the first frequency distribution.

46. The method of claim 45 wherein the first frequency distribution has a first center frequency and the second frequency distribution has a second center frequency different from the first center frequency.

47. The method of claim 46 wherein the first center frequency is greater than the second center frequency.

48. The method of claim 40 further comprising:

varying a characteristic of the second electromagnetic signal as a function of time, wherein varying a characteristic of the second electromagnetic signal as a function of time changes the first photonic band gap distribution as a function of time.

49. The method of claim 40 further comprising:

reducing the amount of heating of the at least a first portion of the first region.

50. A method comprising:

propagating a first electromagnetic signal in a first region having a first photonic band gap distribution;

converting a second electromagnetic signal, different from the first electromagnetic signal, to a first electrical signal;

moving at least a first portion of the first region with the first electrical signal, wherein moving at least a first portion of the first region changes the first photonic band gap distribution; and

adjusting the propagation of the first electromagnetic signal responsive to the change in the first photonic band gap distribution.

51. The method of claim 50 wherein the first electromagnetic signal has a first frequency distribution and the second electromagnetic signal has a second frequency distribution different from the first frequency distribution.

52. The method of claim 51 wherein the first frequency distribution has a first center frequency and the second frequency distribution has a second center frequency different from the first center frequency.

53. The method of claim 50 further comprising:

varying a characteristic of the second electromagnetic signal as a function of time, wherein varying the intensity of the second electromagnetic signal as a function of time changes the first photonic band gap distribution as a function of time.