This book has been written as part of a new series of scientific
text-books being published by Plenum Publishing Company Limited. The
scope of the series is to review a chosen topic in each volume, and in
addition, to present abstracts of the most important references cited in
the text. Thus allowing the reader to supplement the information
contained within this book without have to refer to many additional
publications. This volume is devoted to the subject of Radiation
Detectors, known as Photodetectors, and particular emphasis has been
placed on devices operating in the infrared region of the
electromagnetic spectrum. Although some detectors which are sensitive at
ultraviolet and visible wavelengths, are also described. The existence
of the infrared region of the spectrum has been known for almost two
hundred years but the development of detectors specifically for these
wavelengths was limited for a long time due to technology limitations
and difficulties in understanding and explaining the phenomena involved.
Significant advances were made during World War II, when the potential
military applications of being able "to see in the dar ' were
demonstrated, and this progress has been maintained during the last
forty years when many major advances have been achieved, such that the
use of photodetectors for both civil and military applications is now
relatively common and can be inexpensive.