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[Physics] Weekly Seminar Series-April 10, 2017
Start Date 
End Date 
SMME (CR-405)
​Speaker: Dr. Amir Karim (Acreo Swedish ICT AB. Kista, Sweden)

Title:       Infrared detectors: Advances, challenges and new technologies
Time:       3:00 PM

The history of human knowledge to infrared (IR) radiation is about 200 years old. However it was in the late 20th century when we have developed a wide range of smart technologies to detect it and started to take advantage it for our benefits. Today the IR detector technology is entering into the 3rd generation with challenging demands on the performance. Based on the propagation of IR radiation through free space it is divided into different transmission windows. The most interesting for thermal imaging are the mid-wave IR (MWIR) and the long-wave IR (LWIR) range. Infrared detectors for thermal imaging have a number of applications in industry, security, search & rescue, surveillance, medicine, research, meteorology, climatology and astronomy. Currently the high-performance IR imaging technology is mainly based on epitaxially grown structures of the small-bandgap bulk alloy mercury-cadmium-telluride (MCT) [1, 2], indium antimonide (InSb) [3] and GaAs based quantum-well infrared photodetectors (QWIPs) [4], depending on the application and wavelength range. However they operate at low temperatures requiring costly and bulky cryogenic systems. In addition there is always a need for better performance generating possibilities for developing new technologies for IR imaging. Some of the emerging technologies are quantum dot infrared photodetectors (QDIPs) [5] and type-II strained layer superlattice [6]. In this report the advances and challenges in new technologies for high performance IR detectors, will be presented.