HgCdTe detectors and FPAs for remote sensing applications

Abstract

Short wavelength (SWIR; 1 to 3 jim), middle wavelength (MWIR; 3 to 5 tim), mid-long wavelength (MLWIR; 6 to 8 tim), long wavelength (LWIR; 8 to 14 tim), and very long wavelength (VLWIR; > 14 tim) Focal Plane Arrays (FPAs) are required for remote sensing applications. Advances in the Molecular Beam Epitaxy (MBE) growth of Mercury Cadmium Telluride (HgCdTe) and detector architectures utilized, have resulted in high performance detectors being fabricated in the 1 im to 16 im spectral range. Custom Read Out Integrated Circuits (ROICs) are designed and fabricated to interface the HgCdTe detector arrays. The hybrid focal plane array is made up of the HgCdTe detector array and the CMOS-based ROTC.

Multispectral and hyperspectral imaging technologies in conservation: current research and potential applications

“…MCT detectors cover almost the entire infrared region (1-20 µm) and their spectral cut-off can be finely tuned over the whole spectral range by varying the Hg:Cd ratio in the composition of the semi-conductor [27,31]. For applications above 3 µm, MCT detectors need to be cooled down to liquid nitrogen temperatures, but SWIR-MCT detectors can operate at around 200°K with Peltier cooling.…”

Outdoor Applications of Hyperspectral Imaging Technology for Monitoring Agricultural Crops: A Review

“…In HSI of agricultural crops, photonic detectors are commonly used for monitoring. Different types of detectors have been proposed; in particular, chargecoupled devices (CCDs) that are made from low-cost lead oxide-lead sulfide (PbO-PbS), indium gallium arsenide (InGaAs), or mercury cadmium telluride (HgCdTe or MCT) have been commonly applied to determine the amount of light emission or absorption at particular peaks throughout the spectrum (Casini et al, 1999;D'Souza et al, 1999;Sizov, 2000;Gat, 2000;John et al, 2003;Tran, 2003;Bajwa et al, 2004;Rogalski, 2004;Xenics, 2016). In this technique, it is important to identify a distinct spectral range and obtain particular peaks from the spectrum.…”

Ик-Фотоэлектроника: Фотонные Или Тепловые Детекторы? Перспективы

“…ельство является основной причиной функционирования матриц тепловых излучения, главным образом, в области спектра прозрачности атмосферы 8зируя значения параметра D* λ (λ) фотонных детекторов можно сделать что большинство из современных ИК фотонных детекторов работают в зком к BLIP режиму. Например, для HgCdTe детекторов обнаружительная достигает значений D*λ ≈ 2⋅10 11 cм⋅Гц 1/2 /W для области спектра λ max ≈ 10.5 ≈ 30° (λ u ≈ 7.8 μm, λ co ≈ 11.2 мкм, плотность потока фотонов N ph ≈ Sensor Electronics and Мicrosystem Technologies 2015 -T. 12, № 1 39 D* λ = 3.9•10 11 cм•Гц 1/2 /Вт, а для матриц с λ co = 15.8 мкм, при температуре 40 K, D* λ = 2.76•10 11 cм•Гц 1/2 /Вт[27]. Для сравнения, об-…”