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Spectral Crosstalk Reduction for Dual-band Long Wave Infrared Detectors

TECHNOLOGY AREA(S): Electronics, Materials/Processes, Sensors OBJECTIVE: Seeking solutions to reduce spectral crosstalk of dual-band long wave infrared (LWIR) III-V strained layer superlattice (SLS) based infrared (IR) focal plane arrays (FPA)/detectors. DESCRIPTION: Multi-color FPAs made of III-V SLS semiconductor materials have shown very promising results in recent years. Further improvement in SLS device performance is desired to meet sensor system requirements for long wave applications. One particular technical challenge limiting the utility of dual-band SLS FPAs and detectors is unwanted spectral crosstalk. Some potential sources of spectral crosstalk include:Incomplete optical absorption of photons at one absorber due to broadband peak width.Low quantum efficiency in each absorber region.Radiative recombination of carriers generated by photons at band 1 and emitting into band 2.Flawed device barrier architecture.This topic solicits innovative ideas for the design and fabrication of dual-band detectors and FPAs achieving spectral crosstalk less than 5% for each band while maintaining detector performance. Methods that will sharpen detector cutoff, increase FPA quantum efficiency, and optimize the device design and engineering to eliminate spectral crosstalk root cause, are encouraged.For this solicitation, assume the following:The dual-band infrared detector uses two coupled III-V SLS photodetectors stacked back to back, one operating in the 6 to 8 micrometer band and the other in the 9 to 11 micrometer band.The transmission is approximately 90% inside each passband and approximately 0% outside the two passbands.An external dual-band filter in the incoming light path can be taken into consideration for out of band blocking. An effective detector anti-reflection coating is acceptable for increasing quantum efficiency and sensitivity.Crosstalk arises from leakage due to band overlap. PHASE I: Determine the root cause(s) of spectral crosstalk via modeling and experimental study. Design, fabricate, and validate a single-element dual-band detector to analyze and verify the correlation of crosstalk reduction with device design parameters. Develop a detailed plan for Phase II implementation. PHASE II: Demonstrate single-element dual-band detectors with spectral crosstalk of less than 5% (with the external filter). Validation of results at the FPA level is encouraged, with the following performance goal: quantum efficiency larger than 90% in band 1 and 50% in band 2, spectral crosstalk less than 5%, format and pitch: 512 x 512 or larger, 30 micrometer pitch. The FPA should be properly anti-reflection coated and passivated. The median dark current density should be within 10 times of Rule 07. PHASE III DUAL USE APPLICATIONS: Either solely, or in partnership with a suitable production foundry, the contractor will implement and verify, in full scale, that the Phase II demonstration technology is economically viable. The contractor will transition the technology to the appropriate prime contractor for the engineering integration and testing. KEYWORDS: Infrared Focal Plane Array, Long Wave Infrared, Multi-color Infrared Detector, Spectral Crosstalk Reduction POINT OF CONTACT: Ping Hagler, Phone: 256-450-4676, Email: ping.hagler@mda.mil

  • Agency: Missile Defense Agency,Department of Defense,Department of Defense
  • Program: STTR
  • Phase: Phase I
  • Release Date: August 27, 2015
  • Open Date: September 28, 2015
  • Close Date: October 28, 2015
  • URL: https://sbir.defensebusiness.org/topics
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