MIOMD-XI Speakers    
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1.  Prof. Antoni Rogalski, Military University of Technology, POLAND
Invited Talk: HgCdTe versus other material systems: a historical look
Speaker Biography: Antoni Rogalski is a professor at the Institute of Applied Physics, Military University of Technology in Warsaw, Poland. He is a leading researcher in the field of infrared (IR) optoelectronics. During the course of his scientific career, he has made pioneering contributions in the areas of theory, design, and technology of different types of IR detectors. In 1997, he received an award from the Foundation for Polish Science (the most prestigious scientific award in Poland) for achievements in the study of ternary alloy systems for infrared detectors. In 2004, he was elected as a corresponding member of the Polish Academy of Sciences.

Summary: In 1959, Lawson and co-workers publication triggered development of variable band gap Hg1-xCdxTe (HgCdTe) alloys providing an unprecedented degree of freedom in infrared detector design. This first paper reported both photoconductive and photovoltaic response at wavelengths extending out to 12 μm, and made the understated observation that this material showed promise for intrinsic infrared detectors. HgCdTe technology development was and continues to be primarily for military applications. A negative aspect of support by defense agencies has been the associated secrecy requirements that inhibit meaningful collaborations among research teams on a national and especially on an international level. In addition, the primary focus has been on focal plane array demonstration and much less on establishing the knowledge base. Nevertheless, significant progress has been made over four decades. At present, HgCdTe is the most widely used variable gap semiconductor for infrared photodetectors.
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