2048 X 2048 HgCdTe Arrays for Astronomy at Visible and Infrared Wavelengths

Details 2048 X 2048 HgCdTe Arrays for Astronomy at Visible and Infrared Wavelengths 2048 X 2048 HgCdTe Arrays for Astronomy at Visible and Infrared Wavelengths

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998esoc...55..222h&link_type=abstract

NICMOS and the VLT: A New Era of High Resolution Near Infrared Imaging and Spectroscopy, Pula, Sardinia, Italy, June 26-27th 199

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In collaboration with the European Southern Observatory and the Subaru project, the University of Hawaii Institute for Astronomy has entered into a partnership with Rockwell International Science Center to develop 2048 x 2048 format HAWAII-2 HgCdTe arrays for low background ground based astronomical applications. Present plans call for production of 2048 x 2048 multiplexers late in 1998 and hybrid arrays utilizing 2.5 micron PACE HgCdTe in 1999. However Rockwell has recently achieved a breakthrough in HgCdTe material quality through use of new detector growth technologies which utilize p/n double layer planar heterostructure arrays grown by MBE on lattice matched CdZnTe substrates. Initial tests of this material have demonstrated near theoretical dark current as a function of temperature and cutoff wavelength. UH IfA and Rockwell plan to evaluate arrays utilizing this new material for use in the Next Generation Space Telescope. The primary goal would be to directly compare the performance of lambda.c = 5 micron cut off wavelength 2048 x 2048 HgCdTe arrays with that of 1024 x 1024 InSb arrays. However HgCdTe offers the advantage that lambda.c can be tailored to any value from 1.2 to 17 microns; a second goal of the investigation would be to fabricate, test and demonstrate 2048 x 2048 HgCdTe arrays with lambda.c values of 1.8 and 2.5 microns. Although the investigation would focus primarily on 1 - 5 micron detectors, the same multiplexers could also be hybridized to Si PIN diode arrays, providing sensitivity down through the visible into the ultraviolet. These large format arrays offer potential advantages for both space and ground based applications.

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