18 Result(s)
within
Chapter
J. D. Joannopoulos
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Chapter and Conference Paper
DEFECT-RELATED ISSUES IN HIGH-K DIELECTRICS
The roles of impurities and point defects are again coming to the forefront as new materials, such as high-k dielectrics, and novel device structures (e.g., double gate MOSFETs) are introduced in new generatio...
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Chapter
Modeling at the Speed of Light
For over half a century, semiconductor physics has played a vital role in almost every aspect of modern technology. Advances in this field have allowed scientists to adapt the conducting properties of material...
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Chapter
Novelties of Light with Photonic Crystals
Within the past several years “photonic crystals” have emerged as a new class of materials providing capabilities along new dimensions for the control and manipulation of light. These materials are viewed idea...
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Chapter and Conference Paper
An introduction to photonic crystals
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Chapter
An Introduction to Photonic Crystals
During the past five years, there has emerged a new class of materials called photonic band gap materials or, more simply, photonic crystals. The underlying concept behind these materials stems from early noti...
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Chapter
Microcavities in Channel Waveguides
We introduce and analyse a new type of resonant microcavity consisting of a channel waveguide and a one-dimensional photonic crystal. A band gap for the guided modes is opened and a state is created within the...
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Chapter
Microcavities in Photonic Crystals
The introduction of a defect in a perfect photonic crystal can lead to the creation of sharp resonant electromagnetic states in the vicinity of the defect. The properties of these modes can be controled simply...
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Chapter
Wide Stop Band Optical Filters from Photonic Band Gap Air Bridges
Photonic band gap materials can produce optical filters with large stop bands and sharp transmission resonances. The transmission spectrum and radiation characteristics of one such filter are described using a...
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Chapter and Conference Paper
Ab-Initio Investigations of Surfaces and Grain Boundaries in Germanium
This paper describes the application of ab-initio total energy pseudopotential calculations to investigate surfaces and grain boundaries in germanium. Parameters have been calculated for an effective Hamiltoni...
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Chapter
The Design of Convergent and Transferable Ab Initio Pseudopotentials
This paper exhibits a criterion for creating pseudopotentials which possess rapid convergence in a plane-wave basis set. We demonstrate the applicability of this criterion in conjunction with many prescription...
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Chapter and Conference Paper
Intergranular Total Energy Maps and the Structure of a Grain Boundary
An ab initio theoretical investigation of the structure of a twist grain boundary in Ge is performed whereby the intergranular total energy is mapped out over the entire range of possible relative in-plane tra...
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Chapter
Elimination of Photo-Induced Degradation in Semiconductor Devices
Hydrogenated amorphous silicon and related alloys ordinarily exhibit photo-induced changes that degrade device behavior, particularly in solar-cell applications. On the basis of a recently developed theory for...
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Chapter and Conference Paper
A Total Energy-Renormalization Group Approach to the Phase Transition of Solid Surfaces
The tight-binding energy minimization method is combined with a renormalization-group calculation to study the structural phase transition of the Si(100) surface. The ground-state reconstruction is found to be...
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Chapter and Conference Paper
Intrinsic Defects in Silicon: Formation and Migration Energies
Total energy calculations have been performed yielding formation and migration energies of silicon self-interstitials and vacancies with and accuracy of a few tenths of an electron volt. Direct comparison with...
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Chapter
Predicting the Structure of Solids
One of the oldest fundamental problems in condensed matter physics has been the prediction of the crystal structure of solids from first principles. Given only the atomic number of the constituent atoms as inp...
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Chapter and Conference Paper
The Electronic Structure of Crystalline Phases of Se and Te
A theoretical study of the electronic structure of crystalline phases of Se and Te is presented in four parts. The first part deals with a review of theoretical techniques and results in the study of trigonal ...
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Chapter and Conference Paper
Bonding Coordination Defects in Selenium
A great variety of experimental phenomena have been attributed to under- or over-coordinated sites in chalcogenide glasses. The electronic structure of these bonding coordination defects has proven to be an in...
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Chapter and Conference Paper
Electronic Densities of States of Amorphous and Trigonal Se and Te
We have used the Empirical Pseudopotential Method to obtain electronic densities of states and charge distributions for the valence electrons in trigonal Se and Te. We have explored the relation between densit...
