Accession Number : ADA265599


Title :   Development of Ultra-Low Noise, High Sensitivity Planar Metal Grating Coupled III-V Multiquantum Well Infrared Detectors for Focal Plane Array Staring IR Sensor Systems


Descriptive Note : Quarterly progress rept. no. 7,


Corporate Author : FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL ENGINEERING


Personal Author(s) : Li, Shang S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a265599.pdf


Report Date : 01 May 1993


Pagination or Media Count : 71


Abstract : During this reporting period we have continued to make progress towards the program goals. We have designed, fabricated, and characterized several new types of 2-D metal grating coupled n-type GaAs/AlGaAs, AlAS/AlGaAs, InAlAs/InGaAs, and InGaP/GaAs QWIPs for 2-14 micrometers focal plane arrays (FPAs) staring infrared sensor applications. In addition, a new normal incidence two-color p-type strained layer InGaAs/InA1As QWIP has been developed for the first time with highest detectivity and low dark current reported for a p-type QWIP. Specific tasks performed during this period include: (1) design, growth, and fabrication of a new normal incidence p-type strained InGaAs/InA1As QWIP grown on InP substrate by MBE technique, (2) completed theoretical and experimental studies of four dual mod operation QWIPs fabricated from n-type GaAs/AlGaAs, InGaAs/InAlAs, and AlAs/AiGaAs material systems, (3) completed theoretical and experimental studies of a type-II AlAs/AlGaAs QWIP, (4) developed a new 2-D square mesh metal grating coupled structure for an InAlAs/ InGaAs BTM QWIP with significant improvement in detector's responsivity and detectivity, (5) performed noise characterization on the InGaAs/InAlAs QWIP and identified the noise sources in this QWIP, (6) completed numerical simulations of coupling quantum efficiency versus grating periodicity and grating dimension for a 2-D square mesh metal grating coupler formed on both the standard and BTM QWIPs


Descriptors :   *INFRARED DETECTORS , *PHOTODETECTORS , QUANTUM WELLS , GALLIUM ARSENIDES , ALUMINUM GALLIUM ARSENIDES , ALUMINUM ARSENIDES , LOW NOISE , INDIUM PHOSPHIDES , SUPERLATTICES , ARRAYS , GRATINGS(SPECTRA)


Subject Categories : Electrooptical and Optoelectronic Devices
      Infrared Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE