Download or read book Computational Studies of Engineered Defects in Colloidal Photonic Crystals written by Nathan Lipkowitz and published by . This book was released on 2008 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis is an exploration of the properties of engineered defects in self-assembled photonic crystals, with particular attention paid to the complete band gap of the a-Si inverse opal. The potential of this metamaterial for optical signal processing in telecommunications is studied using a pair of complementary simulation techniques; one is a frequency-domain code, while the other is in the time domain. Calculations of photonic states associated with isolated point defects are performed, and their cavity modes, losses and field distributions are calculated. The equivalence of two classes of defects is demonstrated, and a robust, single-mode point defect microcavity is proposed. A linear defect waveguide, comprised of coupled chain of such point defects, is analyzed. Transmission around sharp bends is demonstrated, and some simple devices are considered. Several potential approaches to fabrication of the defects, the properties of various candidate materials, and more complex devices are discussed.
Download or read book Intrinsic and Extrinsic Defects in Colloidal Photonic Crystal Films written by Evangellos William Vekris and published by . This book was released on 2007 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photonic crystals (PC's) are a new class of engineered material that is structurally periodic on the scale of optical wavelengths. One promising form of photonic crystal is the self-assembled colloidal crystal film, which consist of a close-packed lattice of colloidal spheres and can be grown inexpensively from a colloidal dispersion. This crystal can serve as a template for the infiltration of a material of higher refractive index, such as silicon, to create a material possessing a complete photonic bandgap (PBG). However, the self-assembled nature of colloidal crystal films allows the formation of intrinsic defects. Such defects, disruptions in the lattice periodicity, can be expected to influence the optical properties of this photonic material. Here, various intrinsically-formed defects are structurally analyzed by microscopy, and their optical properties are then individually measured through careful spatially-resolved optical spectroscopy. Point, line, and volume defects are shown to contribute to incoherent scattering, in good agreement with numerical simulation. In all cases, the influence of such defects on the fundamental stop-band is negligible, while influences on the "higher-band" region of the bandstructure and the PBG are shown to be significant. Stacking faults, variations in the stacking of close-packed crystalline planes, are also analysed. It is shown that different stacking sequences give rise to unique optical spectra, which are shown to differ in the higher-band region of the bandstructure, while leaving the fundamental stopgap unaffected. Additionally, stacking faults are shown to be caused by the incorporation of differently-sized impurity spheres in the lattice, a hard- sphere type mechanism analogous to atomic systems. A fabrication method for extrinsic defects, those which are deliberately introduced to create a designed photonic functionality, and which combines top-down photolithographic patterning with bottom-up self-assembly, is presented. Defects created using this technique can potentially serve as optical waveguides in silicon inverse colloidal photonic crystals, with applications in optical telecommunications or optical computing. Through better understanding of the structure, optical properties, and formation mechanisms of colloidal crystal defects, the quality of self-assembled photonic crystal films can be improved, resulting in more homogeneous optical properties and allowing the full-potential of colloidal photonic crystals to be realized.
Download or read book Designed Functional Defects in Colloidal Photonic Crystals Switching Biomonitoring and Modified Photoluminescence written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Two complementary bottom-up approaches are presented for the controlled incorporation of "smart" planar defects into self-assembled colloidal photonic crystals (CPCs). The defect layer is based on a functional nanometer scaled thin film that is either prepared by layer-by-layer self-assembly and microcontact transfer printing or by spin-coating and sacrificial CPC infiltration. The developed methods allow for the integration of designed defect thin films from a huge variety of chemically diverse materials and can be employed at low-cost and large-scale. Optical spectra show a sharp transmission state within the photonic stop band, induced by the defect. The position of the defect wavelength is dependent on the optical thickness of the defect layer. Active tuning of the intragap defect state is performed by preparing defect layers from macromolecules responsive to external stimuli such as light, temperature, redox-cycling and mechanical pressure. The studies are supported by independently performed ellipsometry measurements and theoretical scalar wave approximation calculations. In addition, CPCs with functional biomolecular planar defects are presented. Through shifts of the defect mode, DNA conformational changes, the enantioselective intercalation of a chiral anti-cancer drug and enzyme activities are optically monitored. Incorporation of fluorescent dyes and quantum dots into defect CPCs leads to a clear modification of the photoluminescence (PL) spectra by photonic stopband and defect state. Switchable PL modification is detected when employing addressable defect CPCs.
Download or read book Computational Nanotechnology written by Sarhan M. Musa and published by CRC Press. This book was released on 2018-09-03 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: Applications of nanotechnology continue to fuel significant innovations in areas ranging from electronics, microcomputing, and biotechnology to medicine, consumer supplies, aerospace, and energy production. As progress in nanoscale science and engineering leads to the continued development of advanced materials and new devices, improved methods of modeling and simulation are required to achieve a more robust quantitative understanding of matter at the nanoscale. Computational Nanotechnology: Modeling and Applications with MATLAB® provides expert insights into current and emerging methods, opportunities, and challenges associated with the computational techniques involved in nanoscale research. Written by, and for, those working in the interdisciplinary fields that comprise nanotechnology—including engineering, physics, chemistry, biology, and medicine—this book covers a broad spectrum of technical information, research ideas, and practical knowledge. It presents an introduction to computational methods in nanotechnology, including a closer look at the theory and modeling of two important nanoscale systems: molecular magnets and semiconductor quantum dots. Topics covered include: Modeling of nanoparticles and complex nano and MEMS systems Theory associated with micromagnetics Surface modeling of thin films Computational techniques used to validate hypotheses that may not be accessible through traditional experimentation Simulation methods for various nanotubes and modeling of carbon nanotube and silicon nanowire transistors In regard to applications of computational nanotechnology in biology, contributors describe tracking of nanoscale structures in cells, effects of various forces on cellular behavior, and use of protein-coated gold nanoparticles to better understand protein-associated nanomaterials. Emphasizing the importance of MATLAB for biological simulations in nanomedicine, this wide-ranging survey of computational nanotechnology concludes by discussing future directions in the field, highlighting the importance of the algorithms, modeling software, and computational tools in the development of efficient nanoscale systems.
Download or read book Theoretical Foundations and Application of Photonic Crystals written by Alexander Vakhrushev and published by BoD – Books on Demand. This book was released on 2018-04-04 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is devoted to the description of research and design of photonic crystals. Topics included in the book cover a wide range of research in the field of theoretical analysis and experimental investigation: the electromagnetic field in the photonic crystal, propagation of waves in the gyrotropic magnetophotonic crystals, low one-photon absorption, ultratransparent photonic crystals, colloidal assembly, photonic crystal application for development of all-optical computational system, design strategies for PC devices, self-organization of liquid crystalline nanostructures, and optical diodes. This book will be useful for engineers, technologists, researchers, and postgraduate students interested in the research, design, fabrication processes, and applications of photonic crystals.
Download or read book Fabrication and Defect Design in Two dimensional Colloidal Photonic Crystals written by Erik Peter Geiss and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photonic Crystals written by John D. Joannopoulos and published by Princeton University Press. This book was released on 2011-10-30 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since it was first published in 1995, Photonic Crystals has remained the definitive text for both undergraduates and researchers on photonic band-gap materials and their use in controlling the propagation of light. This newly expanded and revised edition covers the latest developments in the field, providing the most up-to-date, concise, and comprehensive book available on these novel materials and their applications. Starting from Maxwell's equations and Fourier analysis, the authors develop the theoretical tools of photonics using principles of linear algebra and symmetry, emphasizing analogies with traditional solid-state physics and quantum theory. They then investigate the unique phenomena that take place within photonic crystals at defect sites and surfaces, from one to three dimensions. This new edition includes entirely new chapters describing important hybrid structures that use band gaps or periodicity only in some directions: periodic waveguides, photonic-crystal slabs, and photonic-crystal fibers. The authors demonstrate how the capabilities of photonic crystals to localize light can be put to work in devices such as filters and splitters. A new appendix provides an overview of computational methods for electromagnetism. Existing chapters have been considerably updated and expanded to include many new three-dimensional photonic crystals, an extensive tutorial on device design using temporal coupled-mode theory, discussions of diffraction and refraction at crystal interfaces, and more. Richly illustrated and accessibly written, Photonic Crystals is an indispensable resource for students and researchers. Extensively revised and expanded Features improved graphics throughout Includes new chapters on photonic-crystal fibers and combined index-and band-gap-guiding Provides an introduction to coupled-mode theory as a powerful tool for device design Covers many new topics, including omnidirectional reflection, anomalous refraction and diffraction, computational photonics, and much more.
Download or read book Computational Study and Analysis of Structural Imperfections in 1D and 2D Photonic Crystals written by Karlene Rosera Maskaly and published by . This book was released on 2005 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) Additionally, the problem of acircular pores in 2D photonic crystals is investigated, showing that almost a 50% change in reflectivity can occur for some structures. Furthermore, this study reveals trends that are consistent with the D simulations: parameter changes that increase the absolute reflectivity of the photonic crystal will also increase its tolerance to structural imperfections. Finally, experimental reflectance spectra from roughened D photonic crystals are compared to the results predicted computationally in this thesis. Both the computed and experimental spectra correlate favorably, validating the findings presented herein.
Download or read book Nanochemistry written by Geoffrey A Ozin and published by Royal Society of Chemistry. This book was released on 2023-01-17 with total page 875 pages. Available in PDF, EPUB and Kindle. Book excerpt: International interest in nanoscience research has flourished in recent years, as it becomes an integral part in the development of future technologies. The diverse, interdisciplinary nature of nanoscience means effective communication between disciplines is pivotal in the successful utilization of the science. Nanochemistry: A Chemical Approach to Nanomaterials is the first textbook for teaching nanochemistry and adopts an interdisciplinary and comprehensive approach to the subject. It presents a basic chemical strategy for making nanomaterials and describes some of the principles of materials self-assembly over 'all' scales. It demonstrates how nanometre and micrometre scale building blocks (with a wide range of shapes, compositions and surface functionalities) can be coerced through chemistry to organize spontaneously into unprecedented structures, which can serve as tailored functional materials. Suggestions of new ways to tackle research problems and speculations on how to think about assembling the future of nanotechnology are given. Primarily designed for teaching, this book will appeal to graduate and advanced undergraduate students. It is well illustrated with graphical representations of the structure and form of nanomaterials and contains problem sets as well as other pedagogical features such as further reading, case studies and a comprehensive bibliography.
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photonic Crystals written by Kuon Inoue and published by Springer. This book was released on 2013-11-11 with total page 329 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photonic crystals are a very hot topic in photonics. The basics, fabrication, application and new theoretical developments in the field of photonic crystals are presented in a comprehensive way, together with a survey of the advanced state-of-the-art report.
Download or read book Photonic Crystals Physics and Technology written by Concita Sibilia and published by Springer Science & Business Media. This book was released on 2009-02-03 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the work is give an overview of the activity in the field of Photonic Crystal developed in the frame of COST P11 action . The main objective of the COST P11 action was to unify and coordinate national efforts aimed at studying linear and nonlinear optical interactions with Photonic Crystals (PCs), without neglecting an important aspect related to the material research as idea and methods of realizations of 3D PC, together with the development and implementation of measurement techniques for the experimental evaluation of their potential applications in different area, as for example telecommunication with novel optical fibers, lasers, nonlinear multi-functionality, display devices, opto-electronics, sensors. The book contains contributions from authors who gave their lecture at the Cost P11 Training School.
Download or read book Summaries of Papers Presented at the Quantum Electronics and Laser Science Conference written by and published by . This book was released on 2002 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Science Technology Index written by and published by . This book was released on 2000 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photonic Crystals written by Qihuang Gong and published by CRC Press. This book was released on 2014-02-06 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a broad overview of photonic crystals and, as the title suggests, covers their principles and applications. It is written from a physics point of view with an emphasis on materials science. Equations are well explained and often completely avoided to increase the readability of the book. The book is divided into eight chapters, starting with a brief introduction. The second chapter deals with different dimensionalities of the photonic crystals and their properties. The third chapter is very interestingly written and provides a survey of the various synthesis methods used for production of photonic crystals, including chemical routes, lithography, and self-assembly of colloidal photonic crystals. Chapters 4–8 constitute the bulk of the book and provide examples of applications of these photonic crystals. Chapter 4 offers a good explanation of optical switching. Bandgap and defect mode switching are also brought into focus along with many other mechanisms—14 different switching mechanisms in all, including thermal, electro, and magneto switching. Frequency tuning of photonic crystal filters with special attention to nanosize photonic crystals is illustrated, providing a direct perspective on applications of these materials in integrated photonic circuits. The transition from chapter 5 to 6 dealing with photonic crystal lasers is smooth, especially after a clear description of frequency tuning. Here, one- to three-dimensional photonic lasers are explained along with laser oscillations produced by a variety of microcavity methods. Metallodielectric and liquid-crystal photonic lasers are equally well illustrated. Chapter 7 introduces logic devices based on photonic crystals. This chapter clearly explains, with the help of simple illustrations, how to obtain AND, OR, and XOR logic gates. Chapter 8 concludes the book by presenting possible applications, including gas, chemical, fluid, and cell sensing; their workings are very well described from a fundamental point of view. The diagrams and illustrations are appropriate and eye catching. There are ample references; thus readers are able to find more detailed information to satisfy their curiosity if the book does not suffice. Even though the introduction provides basics of these photonic crystals, I do get the impression that the bigger picture is missing. A nonexpert may not understand the direct application of such materials right from the beginning of the book. A flowchart or a diagram of these photonic crystals, illustrating applications in daily life at the beginning of the book, could attract a broader readership. In this regard, I believe that this book is most adapted to physicists with a materials science background or vice versa. However, one should take into consideration that the principles of photonic crystals cannot be explained without physics, and therefore the quality of this book remains intact and could very well serve as a textbook for future physicists.
Download or read book Photonic Band Gap Materials written by C.M. Soukoulis and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 725 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photonic band gap crystals offer unique ways to tailor light and the propagation of electromagnetic waves. In analogy to electrons in a crystal, EM waves propagating in a structure with a periodically-modulated dielectric constant are organized into photonic bands separated by gaps in which propagating states are forbidden. Proposed applications of such photonic band gap crystals, operating at frequencies from microwave to optical, include zero- threshold lasers, low-loss resonators and cavities, and efficient microwave antennas. Spontaneous emission is suppressed for photons in the photonic band gap, offering novel approaches to manipulating the EM field and creating high-efficiency light-emitting structures. Photonic Band Gap Materials identifies three most promising areas of research. The first is materials fabrication, involving the creation of high quality, low loss, periodic dielectric structures. The smallest photonic crystals yet fabricated have been made by machining Si wafers along (110), and some have lattice constants as small as 500 microns. The second area is in applications. Possible applications presented are microwave mirrors, directional antennas, resonators (especially in the 2 GHz region), filters, waveguides, Y splitters, and resonant microcavities. The third area covers fundamentally new physical phenomena in condensed matter physics and quantum optics. An excellent review of recent development, covering theoretical, experimental and applied aspects. Interesting and stimulating reading for active researchers, as well as a useful reference for non-specialists.
Download or read book Topological Soft Matter written by Francesca Serra and published by Frontiers Media SA. This book was released on 2020-12-02 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
