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The major thrust of this book is the realisation of an all optical
computer. To that end it discusses optoelectronic devices and
applications, transmission systems, integrated optoelectronic
systems and, of course, all optical computers. The chapters on
heterostructure light emitting devices' quantum well carrier
transport optoelectronic devices' present the most recent advances
in device physics, together with modern devices and their
applications. The chapter on microcavity lasers' is essential to
the discussion of present and future developments in solid-state
laser physics and technology and puts into perspective the present
state of research into and the technology of optoelectronic
devices, within the context of their use in advanced systems. A
significant part of the book deals with problems of propagation in
quantum structures. soliton-based switching, gating and
transmission systems' presents the basics of controlling the
propagation of photons in solids and the use of this control in
devices. The chapters on optoelectronic processing using smart
pixels' and all optical computers' are preceded by introductory
material in fundamentals of quantum structures for optoelectronic
devices and systems' and linear and nonlinear absorption and
reflection in quantum well structures'. It is clear that new
architectures will be necessary if we are to fully utilise the
potentiality of electrooptic devices in computing, but even current
architectures and structures demonstrate the feasibility of the all
optical computer: one that is possible today.
This volume on Advanced Electronic Technologies and Systems based
on Low Dimensional Quantum Devices closes a three years series of
NATO -AS ' s. The first year was focused on the fundamental
properties and applications. The second year was devoted to Devices
Based on Low-Dimensional Semiconductor Structures. The third year
is covering Systems Based on Low-Dimensional Quantum Semiconductor
Devices. The three volumes containing the lectures given at the
three successive NATO -ASI's constitute a complete review on the
latest advances in semiconductor Science and Technology from the
methods of fabrication of the quantum structures through the
fundamental physics am basic knowledge of properties and projection
of performances to the technology of devices and systems. In the
first volume: " Fabrication, Properties and Application of Low
Dimensional Semiconductors" are described the practical ways in
which quantum structures are produced, the present status of the
technology, difficulties encountered, and advances to be expected.
The basic theory of Quantum Wells, Double Quantum Wells and
Superlattices is introduced and the fundamental aspects of their
optical properties are presented. The effect of reduction of
dimensionality on lattice dynamics of quantum structures is also
discussed. In the second volume: " Devices Based on Low Dimensional
Structures" the fundamentals of quantum structures and devices in
the two major fields: Electro-Optical Devices and Pseudomorphic
High Eectron Mobility Transistors are extensively discussed."
This book aims to show the closed connection between approximation
in respect of Hausdorff metric and analysis and synthesis of
antenna grids. The second goal is to reveal how the tools of
MATHEMATICA programming environment can be used in this direction.
To this end series of MATHEMATICA codes illustrate numerical
methods for finding optimal filters and antennas. The basic
problems considered are approximation of functions and point sets
by algebraic and trigonometric polynomials in Hausdorff metric as
well as their applications in the field of antenna-feeder
technique, analysis and synthesis of antenna patterns and filters,
minimization of noise by suitable approximation of impulse
functions. Fourier analysis is applied for approximation of impulse
and transmitting functions and it is compared to the results
obtained using the elements of the best Hausdorff approximation.
The advantage of Hausdorff metric is the removal of the unpleasant
effect of "Gibbs' phenomena." We hope that the book will be of
interest for the researchers and specialists involved in analysis
and synthesis of antenna patterns and filters facilitating their
research.
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