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This volume looks at optical spectroscopy of semiconductir nanostructures. Some of the topics it covers include: kingdom of nanostructures; quantum confinement in low-dimensional systems; resonant light reflection; and transmission and absorption.
Ultrafast spectroscopy of semiconductors and semiconductor nanostructures is currently one of the most exciting areas of research in condensed-matter physics. Remarkable recent progress in the generation of tunable femtosecond pulses has allowed direct investigation of the most fundamental dynamical processes in semiconductors. This second edition presents the most striking recent advances in the techniques of ultrashort pulse generation and ultrafast spectroscopy; it discusses the physics of relaxation, tunneling and transport dynamics in semiconductors and semiconductor nanostructures following excitation by femtosecond laser pulses.
This program involved research on the utilization of near field optical microscopic and spectroscopic techniques to investigate spatial configurations on a nanometer scale of both integrated photonic structures and semiconductor nanostructures. We have made significant accomplishments in our research effort involving use of these near field techniques to investigate several important areas including photonic bandgap structures or photonic crystals, vertical cavity surface emitting lasers (VCSEL's), and optical waveguides including multiple interference structures. Near field microscopic and spectroscopic measurements performed on these structures provides more understanding of their behavior than can be ascertained in other ways; such understanding is expected to point toward improved device structures.
This grant supported a program for local spectroscopic studies of semiconductor nanostructure materials. Our work has looked at the various types of techniques of near field optics and pursued the options that are optimized for the optical spectroscopy of semiconductor nanostructures. The thrust of the research has involved the use of solid immersion lenses. This form of near field optics strikes a balance between the need for high spatial resolution and high optical throughput. We have demonstrated that these techniques can be implemented within the context of a cryogenic system and obtain spatial resolution of order lambda3. We have used these techniques to characterize naturally occurring quantum dots in thin GaAs quantum wells. Our studies reveal the surprising fact that these samples have not only zero dimensional excitons but also two dimensional excitons. In fact, most of the material plays host to the two dimensional species while the zero dimensional species occupies only 1-3% of the sample. This result is surprising because all of the light emission comes from the zero dimensional exciton. The two dimensional exciton is observed using photoluminescence excitation diffusion, a technique wherein we are able to generate a local optical excitation and watch it diffuse.
Since its inception in 1966, the series of numbered volumes known as Semiconductors and Semimetals has distinguished itself through the careful selection of well-known authors, editors, and contributors. The Willardson and Beer series, as it is widely known, has succeeded in producing numerous landmark volumes and chapters. Not only did many of these volumes make an impact at the time of their publication, but they continue to be well-cited years after their original release. Recently, Professor Eicke R. Weber of the University of California at Berkeley joined as a co-editor of the series. Professor Weber, a well-known expert in the field of semiconductor materials, will further contribute to continuing the series' tradition of publishing timely, highly relevant, and long-impacting volumes. Some of the recent volumes, such as Hydrogen in Semiconductors, Imperfections in III/V Materials, Epitaxial Microstructures, High-Speed Heterostructure Devices, Oxygen in Silicon, and others promise that this tradition will be maintained and even expanded.Reflecting the truly interdisciplinary nature of the field that the series covers, the volumes in Semiconductors and Semimetals have been and will continue to be of great interest to physicists, chemists, materials scientists, and device engineers in modern industry.
Semiconductor nanostructures are attracting a great deal of interest as the most promising device with which to implement quantum information processing and quantum computing. This book surveys the present status of nanofabrication techniques, near field spectroscopy and microscopy to assist the fabricated nanostructures. It will be essential reading for academic and industrial researchers in pure and applied physics, optics, semiconductors and microelectronics. The first up-to-date review articles on various aspects on quantum coherence, correlation and decoherence in semiconductor nanostructures