Method and apparatus for dark field chemical imaging

• US 7,408,636 B2
• Filed: 06/30/2004
• Issued: 08/05/2008
• Est. Priority Date: 10/31/2002
• Status: Active Grant

• Current Assignee: Chemimage Corporation
• Original Assignee: Chemimage Corporation
• Inventors: Tuschel, David, Hutchison, Wesley H., Berkman, Myles P.
• Primary Examiner(s): Geisel; Kara E
• Application Number:
  US10/879,636
• Publication Number:
  US 20060001869A1
• Time in Patent Office: 1,497 Days
• Field of Search: 356/301
• US Class Current: 356/301
• CPC Class Codes: G01J 3/0227 using notch filters
• CPC Class Codes: G01N 21/65 Raman scattering

Abstract

The disclosure is generally directed to a method and apparatus for providing an image of a sample. The apparatus includes an illuminating source for transmitting photons to a sample. The transmitted photons illuminate the sample or are scattered upon reaching the sample. A lens collects the scattered photons and transmits the scattered photons to a tunable filter for forming an image. The illuminating photons traveling from the illuminating source to the sample do not pass through the lens.

Claims

1. A method for obtaining a spatially accurate wavelength-resolved image of a sample, the method comprising the steps of:

illuminating the sample with a plurality of photons to thereby produce photons scattered by the sample; and

collecting the scattered photons through an optical device to thereby obtain a spatially accurate wavelength-resolved image of the sample,

wherein the illuminating photons do not pass through the optical device,

wherein the step of collecting the scattered photons includes obtaining plural sets of scattered photons,

wherein each set of scattered photons contains photons in a predetermined wavelength band different from the predetermined wavelength band of the other sets of scattered photons, and

wherein a spatially accurate wavelength-resolved image of the sample is obtained from each set of scattered photons.

2. The method of claim 1 wherein the scattered photons include photons emitted by the sample.

3. The method of claim 1 wherein the wavelength-resolved image includes a Raman image.

4. The method of claim 1 wherein the wavelength-resolved image includes a luminescence emission image.

5. The method of claim 1 wherein the step of collecting the scattered photons occurs during a predetermined time interval.

6. The method of claim 5 wherein during said time interval the sample undergoes a change selected from the group of changes consisting of:

spatial displacement, chemical interaction, chemical state, phase, growth, shrinkage, chemical decomposition, chemical metabolization, and physical strain.

7. The method of claim 1 wherein the step of illuminating the sample includes illuminating the sample with photons that travel at an angle that is oblique to a plane along which the sample is substantially oriented.

8. The method of claim 1 wherein the wavelength of the scattered photons is different than the wavelength of the illuminating photons.

9. The method of claim 1 wherein the step of illuminating the sample includes illuminating a side of the sample opposite the optical device.

10. The method of claim 1 wherein the step of illuminating the sample includes photons from an evanescent light source.

11. The method of claim 1 wherein the step of collecting scattered photons includes collecting scattered polarized photons.

12. The method of claim 1 wherein the step of collecting scattered photons includes collecting scattered un-polarized photons.

13. The method of claim 1 further comprising the step of filtering the collected photons though an optical filter.

14. The method of claim 1 further comprising the step of spectrally separating the collected photons.

66. The method of claim 1 wherein the step of illuminating the sample includes illuminating a side of the sample farthest from said optical device.

15. A system for obtaining a spatially accurate wavelength-resolved image of a sample, comprising:

a photon emission source for illuminating the sample with a plurality of photons to thereby produce photons scattered by the sample;

an optical lens for collecting the scattered photons;

a filter for receiving the collected scattered photons and providing therefrom filtered photons; and

a charged couple device for receiving the filtered photons and obtaining therefrom a spatially accurate wavelength-resolved image of the sample,

wherein the illuminating photons do not pass through the optical lens,

wherein the scattered photons include plural sets of scattered photons,

wherein each set of scattered photons contains photons in a predetermined wavelength band different from the predetermined wavelength band of the other sets of scattered photons, and

wherein a spatially accurate wavelength-resolved image of the sample is obtained from each set of scattered photons.

16. The system of claim 15 wherein the scattered photons include photons emitted by the sample.

17. The system of claim 15 wherein the wavelength-resolved image includes a Raman image.

18. The system of claim 15 wherein the wavelength-resolved image includes a luminescence emission image.

19. The system of claim 15 wherein the optical lens collects the scattered photons during a predetermined time interval.

20. The system of claim 19 wherein during said time interval the sample undergoes a change selected from the group of changes consisting of:

spatial displacement, chemical interaction, chemical state, phase, growth, shrinkage, chemical decomposition, chemical metabolization, and physical strain.

21. The system of claim 15 wherein the photon emission source illuminates the sample with photons that travel at an angle that is oblique to a plane along which the sample is substantially oriented.

22. The system of claim 15 wherein the wavelength of the scattered photons is different than the wavelength of the illuminating photons.

23. The system of claim 15 wherein the photon emission source illuminates a side of the sample opposite the optical device.

24. The system of claim 15 wherein the photon emission source is an evanescent light source.

25. The system of claim 15 wherein the optical lens collects scattered polarized photons.

26. The system of claim 15 wherein the optical lens collects scattered un-polarized photons.

27. The system of claim 15 further comprising an optical filter.

28. The system of claim 15 wherein the filter spectrally separates the collected photons.

29. The system of claim 15 wherein the filter includes one or more of a photonic crystal, a mirror, a solid state optical device and a micromachined tunable filter.

30. The system of claim 15 wherein the filter is a tunable filter.

31. The system of claim 30 wherein the tunable filter is an optical filter.

32. The system of claim 15 further comprising a notch filter interposed between the optical lens and the ifiter.

33. The system of claim 15 wherein the photon illumination source is positioned at an angle with respect to an axis formed by the sample and the filter.

67. The system of claim 15 wherein the photon emission source illuminates a side of the sample farthest from said optical lens.

34. A method for obtaining a spatially accurate wavelength-resolved image of a sample, the method comprising the steps of:

illuminating the sample with a plurality of photons to thereby produce photons emitted by the sample; and

collecting the emitted photons through an optical device to thereby obtain a spatially accurate wavelength-resolved image of the sample,

wherein the illuminating photons do not pass through the optical device, and

wherein the step of collecting the emitted photons includes obtaining plural sets of emitted photons,

wherein each set of emitted photons contains photons in a predetermined wavelength band different from the predetermined wavelength band of the other sets of emitted photons, and

wherein a spatially accurate wavelength-resolved image of the sample is obtained from each set of emitted photons.

35. The method of claim 34 wherein the wavelength-resolved image includes a Raman image.

36. The method of claim 34 wherein the wavelength-resolved image includes a luminescence emission image.

37. The method of claim 34 wherein the step of collecting the emitted photons occurs during a predetermined time interval.

38. The method of claim 37 wherein during said time interval the sample undergoes a change selected from the group of changes consisting of:

spatial displacement, chemical interaction, chemical state, phase, growth, shrinkage, chemical decomposition, chemical metabolization, and physical strain.

39. The method of claim 34 wherein the step of illuminating the sample includes illuminating the sample with photons that travel at an angle that is oblique to a plane along which the sample is substantially oriented.

40. The method of claim 34 wherein the wavelength of the emitted photons is different than the wavelength of the illuminating photons.

41. The method of claim 34 wherein the step of illuminating the sample includes illuminating a side of the sample opposite the optical device.

42. The method of claim 34 wherein the step of illuminating the sample includes photons from an evanescence light source.

43. The method of claim 34 wherein the step of collecting emitted photons includes collecting emitted polarized photons.

44. The method of claim 34 wherein the step of collecting emitted photons includes collecting emitted un-polarized photons.

45. The method of claim 34 further comprising the step of filtering the collected photons though an optical filter.

46. The method of claim 34 further comprising the step of spectrally separating the collected photons.

68. The method of claim 34 wherein the step of illuminating the sample with a plurality of photons further comprises illuminating a side of the sample farthest away from the optical device.

47. A system for obtaining a spatially accurate wavelength-resolved image of a sample, comprising:

a photon emission source for illuminating the sample with a plurality of photons to thereby produce photons emitted by the sample;

an optical lens for collecting the emitted photons;

a filter for receiving the collected emitted photons and providing therefrom filtered photons; and

a charged couple device for receiving the filtered photons and obtaining therefrom a spatially accurate wavelength-resolved image of the sample,

wherein the illuminating photons do not pass through the optical lens, and

wherein the emitted photons include plural sets of emitted photons,

wherein each set of emitted photons contains photons in a predetermined wavelength band different from the predetermined wavelength band of the other sets of emitted photons, and

wherein a spatially accurate wavelength-resolved image of the sample is obtained from each set of emitted photons.

48. The system of claim 47 wherein the wavelength-resolved image includes a Raman image.

49. The system of claim 47 wherein the wavelength-resolved image includes a luminescence emission image.

50. The system of claim 47 wherein the optical lens collects the emitted photons during a predetermined time interval.

51. The system of claim 50 wherein during said time interval the sample undergoes a change selected from the group of changes consisting of:

spatial displacement, chemical interaction, chemical state, phase, growth, shrinkage, chemical decomposition, chemical metabolization, and physical strain.

52. The system of claim 47 wherein the photon emission source illuminates the sample with photons that travel at an angle that is oblique to a plane along which the sample is substantially oriented.

53. The method of claim 47 wherein the wavelength of the emitted photons is different than the wavelength of the illuminating photons.

54. The system of claim 47 wherein the photon emission source illuminates a side of the sample opposite the optical device.

55. The system of claim 47 wherein the photon emission source is an evanescence light source.

56. The system of claim 47 wherein the optical lens collects emitted polarized photons.

57. The system of claim 47 wherein the optical lens collects emitted un-polarized photons.

58. The system of claim 47 further comprising an optical filter.

59. The system of claim 47 wherein the filter spectrally separates the collected photons.

60. The system of claim 47 wherein the filter includes one or more of a photonic crystal, a mirror, a solid state optical device and a micromachined tunable filter.

61. The system of claim 47 wherein the filter is a tunable filter.

62. The system of claim 61 wherein the tunable filter is an optical filter.

63. The system of claim 47 further comprising a notch filter interposed between the optical lens and the filter.

64. The system of claim 47 wherein the photon illumination source is positioned at an angle with respect to an axis formed by the sample and the filter.

65. The system of claim 47 wherein the one or more wavelength-resolved images of a sample defines a Raman image.

69. The system of claim 47 wherein the sample is interposed between the photon emission source and the optical lens.