KEYWORDS: Mid-IR, Long wavelength infrared, Modulation transfer functions, Semiconducting wafers, Medium wave, Crosstalk, Spectral response, Staring arrays, Diodes, Dark current
In 2022, Leonardo UK presented the first results from Condor HD, a 12μm MWIR-LWIR Dual Waveband Infra-Red (DWIR) high-performance infrared detector, grown by Metal Organic Vapour Phase Epitaxy (MOVPE) on GaAs substrates. By using a “back-to-back” diode structure, these pixels are spatially coherent, and changing the bias polarity across the stacked diodes provides sensitivity in the desired waveband (in this configuration MWIR or LWIR).
This paper discusses further characterisation and development of the CMT structure, demonstrating improvement to spectral bandwidth, QE and MW defects. Leonardo UK have also performed further dark current measurements and spectral crosstalk measurements on these new wafer designs.
Direct MTF characterisation (in both the MWIR and LWIR bands) has enabled confirmation that optical crosstalk between neighbouring pixels in-band is equivalent to that seen on single band MWIR and LWIR devices - results of which are reported herein. Retaining the DWB mesa structure also seen on the 24μm Condor II Detector has been key to this.
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