Uncooled infrared detector

• US 6,114,696 A
• Filed: 07/14/1986
• Issued: 09/05/2000
• Est. Priority Date: 07/14/1986
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Aspen Systems Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Eden, Dayton D.
• Primary Examiner(s): Buczinski, Stephen C.
• Application Number:
  US06/901,071
• Time in Patent Office: 5,167 Days
• Field of Search: 250/330, 250/332, 250/338 SE, 250/338, 250/352, 250/578, 250/338.1, 250/338.4, 343/721, 343/727, 343/793, 257/258, 257/275, 257/442, 257/440
• US Class Current: 250/338.1
• CPC Class Codes: G01J 1/04 Optical or mechanical part supplementary adjustable parts
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0837 Microantennas, e.g. bow-tie
• CPC Class Codes: G01J 5/10 using electric radiation detectors
• CPC Class Codes: H01L 27/14669 Infrared imagers
• CPC Class Codes: H01L 31/0224 Electrodes
• CPC Class Codes: H01L 31/09 Devices sensitive to infrared, visible or ultraviolet radiation H01L31/101 takes precedence
• CPC Class Codes: H01Q 21/062 using dipole aerials; H01Q21/067, H01Q21/068 take precedence
• CPC Class Codes: H01Q 9/16 with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole H01Q9/44 takes precedence

Abstract

An infrared radiation detector device comprises a dipole antenna mounted on a substrate and connected through blocking contacts to a bandgap detector element. The dipole antenna has a length which is approximately one half the wavelength of the incident infrared radiation. The bandgap detector element has linear dimensions which are each substantially smaller than the wavelength of the detected radiation. A group of detector devices are combined to form an array which can produce a pixel signal for an image. Unlike conventional infrared radiation detectors, the disclosed detector device is capable of producing a usable output signal without the need for cooling below ambient temperature.

Claims

1. A device for detecting incident radiation, comprising:

a support structure,

a dipole antenna mounted on said support structure, said antenna having a length equal to approximately one half the wavelength of said radiation, and

a bandgap detector element mounted on said support structure and connected to said dipole antenna through blocking contacts, said detector element having each of the linear dimensions thereof less than the wavelength of said radiation, wherein said incident radiation is captured by said dipole antenna and transferred to said detector element which produces an output signal to indicate detection of said incident radiation.

2. A device for detecting incident radiation as recited in claim 1 wherein said bandgap detector element is mercury cadmium telluride crystal.

3. A device for detecting incident radiation as recited in claim 1 wherein said bandgap detector element is indium antimonide crystal.

4. A device for detecting incident radiation as recited in claim 1 wherein said bandgap detector element is a semiconductor superlattice crystal.

5. A device for detecting incident radiation as recited in claim 1 wherein each of said bandgap detector element linear dimensions is less than one tenth of the wavelength of said incident radiation.

6. A device for detecting incident radiation as recited in claim 1 for infrared radiation having a wavelength of approximately 10 microns wherein the length of said dipole antenna is approximately 5 microns and said detector element linear dimensions are each less than 1.0 microns.

7. A device for detecting incident radiation as recited in claim 1 for infrared radiation having a wavelength of approximately 5 microns wherein said detector element linear dimensions are less than 0.5 micron.

8. A device for detecting incident radiation as recited in claim 1 wherein said blocking contacts are mercury cadmium telluride crystal.

9. A device for detecting incident radiation as recited in claim 1 wherein said bandgap detector element is an uncooled detector element.

10. A device for detecting incident radiation, comprising:

a support structure,

a plurality of dipole antennas mounted on said support structure in a uniform array, each of said antennas having a length equal to approximately one half the wavelength of said radiation,

a plurality of bandgap detector elements connected respectively to said dipole antennas, through blocking contacts, each of said bandgap detector elements having each of the linear dimensions thereof less than the wavelength of said radiation, said bandgap detector elements connected in common, wherein said incident radiation is captured by said dipole antennas of said array and transferred to said detector elements which produce an output signal to indicate detection of said incident radiation.

11. A device for detecting incident radiation as recited in claim 10 wherein each of said bandgap detector elements in mercury cadmium telluride crystal.

12. A device for detecting incident radiation as recited in claim 10 wherein each of said bandgap detector elements is indium antimonide crystal.

13. A device for detecting incident radiation as recited in claim 10 wherein each of said bandgap detector elements is a semiconductor superlattice crystal.

14. A device for detecting incident radiation as recited in claim 10 wherein each of said detector element linear dimensions is less than one tenth of the wavelength of said incident radiation.

15. A device for detecting incident radiation as recited in claim 10 wherein said dipole antennas are positioned parallel within said array.

16. A device for detecting incident radiation as recited in claim 10 for infrared radiation having a wavelength of approximately 10 microns wherein the length of each of said dipole antennas is approximately 5 microns and each said detector element has linear dimensions less than 1.0 micron.

17. A device for detecting incident radiation as recited in claim 10 for infrared radiation having a wavelength of approximately 10 microns wherein the length of each of said dipole antennas is approximately 5 microns and each said detector element linear dimension is less than 0.5 microns.

18. A device for detecting incident radiation as recited in claim 10 wherein said blocking contacts are mercury cadmium telluride crystal.

19. A device for detecting incident radiation as recited in claim 10 wherein said bandgap detector element is an uncooled detector element.

20. An infrared radiation imager, comprising:

a support structure,

a plurality of detector arrays mounted on said support structure in a uniform pattern for receiving incident infrared radiation, each of said arrays for producing a pixel signal for an image which comprises said infrared radiation and is directed to said arrays, and

each of said arrays comprising a plurality of dipole antennas mounted on said support structure in a uniform pattern, each of said antennas having a length equal to approximately one half the wavelength of said infrared radiation, each said array further including a plurality of bandgap detector elements having each of the linear dimensions thereof less than the wavelength of said infrared radiation and connected via blocking contacts respectively to said dipole antennas and further connected to a common node for conveying said pixel signal therethrough, wherein said incident infrared radiation is captured by said dipole antennas and transferred to said detector elements for producing a pixel signal from each of said arrays, said pixel signals comprising said image.

21. An infrared radiation imager as recited in claim 20 wherein each of said bandgap detector elements is mercury cadmium telluride crystal.

22. An infrared radiation imager as recited in claim 20 wherein each of said bandgap detector elements is indium antimonide crystal.

23. An infrared radiation imager as recited in claim 20 wherein each of said bandgap detector elements is a semiconductor supperlattice crystal.

24. An infrared radiation imager as recited in claim 20 wherein each of said bandgap detector element linear dimension is less than one tenth of the wavelength of said infrared radiation.

25. An infrared radiation imager as recited in claim 20 herein said dipole antennas are positioned parallel within said arrays.

26. An infrared radiation imager as recited in claim 20 for infrared radiation having a wavelength of approximately 10 microns wherein the length of each of said dipole antennas is approximately 5 microns and said detector element linear dimensions are each less than 1.0 micron.

27. An infrared radiation imager as recited in claim 20 for infrared radiation having a wavelength of approximately 10 microns wherein the length of each of said dipole antennas is approximately 5 microns and said detector element linear dimensions are less than 0.5 microns.

28. An infrared radiation imager as recited in claim 20 wherein said blocking contact is a crystal of mercury cadmium telluride.

29. An infrared radiation imager as recited in claim 20 wherein said bandgap detector element is an uncooled detector element.

30. A device for detecting incident radiation, comprising:

a support structure;

an antenna mounted on said support structure; and

a bandgap detector element mounted on said support structure and connected to said antenna through blocking contacts, said antenna comprising means for capturing said incident radiation and transferring it to said detector element, which produces an output signal indicative of detection of said incident radiation.

31. The apparatus of claim 30, wherein said antenna is impedence matched to said detector.

32. The apparatus of claim 30, wherein said antenna is a dipole antenna.

33. The apparatus of claim 30, wherein the length of said antenna is equal to approximately one half the wavelength of said radiation.