Accession Number:

ADA242821

Title:

Development of Ultra-Low Noise, High Sensitivity Planar Metal Grating Coupled AlGaAs/GaAs Multiquantum Well Detectors for Focal Plane Array (FPA) staring IR Sensor Systems

Descriptive Note:

Quarterly progress rept. no. 1, 1 Aug-31 Oct 1991

Corporate Author:

FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL ENGINEERING

Personal Author(s):

Report Date:

1991-11-01

Pagination or Media Count:

21.0

Abstract:

Since the beginning of this DARPA sponsored IR detector project, we have made significant progress toward achieving the original project goals. We have designed and fabricated two new types of IR detectors using step- bound-to- miniband SBTM and bound-to-miniband BTM transition multiple-quantum-well MQWsuperlattice SL barrier structures grown by MBE technique. The results showed that the dark current for the SBTM IR detector measured at 77 K was more than one order of magnitude lower than the conventional QWIPs using bound-to- continuum band transition reported in the literature. To optimize the grating couplers for the top and back illumination, we have designed and fabricated 10 new photomasks with various grating patterns and different grating periodicities to be used for the proposed study of light coupling efficiency versus grating periodicity in the large area MQWSL IR detectors.

Subject Categories:

  • Infrared Detection and Detectors
  • Quantum Theory and Relativity
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE