This book discusses the physics and applications of quantum well infrared
photodetectors (QWIPs). The presentation is intended for both students as a
learning text and scientists/engineers as a reference. We have assumed that
the reader has a basic background of quantum mechanics, solid-state physics,
and semiconductor devices. To make this book as widely accessible as possible,
we have attempted to treat and present the materials in a simple and straightforward
fashion. We chose the topics for the book by the following criteria: it
must be well established and understood, and it should have been or potentially
will be used in practical applications. We have addressed most aspects
relevant for the field but have omitted at the same time detailed discussions
of specialized topics such as the valence band quantum wells.