Hybrid Liquid Crystal Photonic Crystal Devices
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Hybrid Liquid Crystal Photonic Crystal Devices
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Author : Yu-Cheng Hsiao
language : en
Publisher:
Release Date : 2022
Hybrid Liquid Crystal Photonic Crystal Devices written by Yu-Cheng Hsiao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Electronic books categories.
In this chapter, the current research and development of the liquid crystal-based photonic crystals is introduced. This chapter will present the essential knowledge of the new photonic crystal technology and applications in simple language. In the recent year, liquid crystal-enabled photonic crystal technologies have attracted broad attentions from scientists. Based on special optical properties of liquid crystal-enabled photonic crystal device, many applications, such as tunable optical filters, tunable optical modulators, optical pulse compressors, laser device, and applications in multiphoton microscopy, have been developed in recent years. In addition, the detailed optical properties, operation principles, and prospects are discussed in this chapter.
Tunable And Memorable Optical Devices With One Dimensional Photonic Crystal Liquid Crystal Hybrid Structures
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Author : Po-Chang Wu
language : en
Publisher:
Release Date : 2012
Tunable And Memorable Optical Devices With One Dimensional Photonic Crystal Liquid Crystal Hybrid Structures written by Po-Chang Wu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Technology categories.
Tunable and Memorable Optical Devices with One-Dimensional Photonic-Crystal/Liquid-Crystal Hybrid Structures.
Organic And Hybrid Photonic Crystals
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Author : Davide Comoretto
language : en
Publisher: Springer
Release Date : 2015-07-20
Organic And Hybrid Photonic Crystals written by Davide Comoretto and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-07-20 with Technology & Engineering categories.
This book provides a multidisciplinary perspective (ranging from chemistry to physics and biology) of the current research and applications of organic and hybrid photonic crystals. The authors detail the chemical and physical tools used to develop organic photonic crystals, explain methods for engineering new nano-structures, and propose novel physical phenomena or technological applications based on such materials. Organic and Hybrid Photonic Crystal lasers, sensors, photovoltaic devices and stimuli responsive devices are discussed.
Advances In Photonic Crystals And Devices
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Author : Narendra Kumar
language : en
Publisher: CRC Press
Release Date : 2019-09-06
Advances In Photonic Crystals And Devices written by Narendra Kumar and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-09-06 with Science categories.
In recent decades, there has been a phenomenal growth in the field of photonic crystal research and has emerged as an interdisciplinary area. Photonic crystals are usually nanostructured electromagnetic media consisting of periodic variation of dielectric constant, which prohibit certain electromagnetic wave frequency ranges called photonic bandgaps to propagate through them. Photonic crystals elicited numerous interesting features by unprecedented control of light and their exploitation is a promising tool in nanophotonics and designing optical components. The book ‘Advances in Photonic Crystals and Devices’ is designed with 15 chapters with introductory as well as research and application based contents. It covers the following highlighted features: Basics of photonic crystals and photonic crystal fibers Different theoretical as well as experimental approaches Current research advances from around the globe Nonlinear optics and super-continuum generation in photonic crystal fibers Magnetized cold plasma photonic crystals Liquid crystal defect embedded with graphene layers Biophysics and biomedical applications as optical sensors Two-dimensional photonic crystal demultiplexer Optical logic gates using photonic crystals A large number of references The goal of this book is to draw the background in understanding, fabrication and characterization of photonic crystals using a variety of materials and their applications in design of several optical devices. Though the book is useful as a reference for the researchers working in the area of photonics, optical computing and fabrication of nanophotonic devices, it is intended for the beginners like students pursuing their masters’ degree in photonics.
Cholesteric Liquid Crystal Photonic Crystal Lasers And Photonic Devices
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Author : Ying Zhou
language : en
Publisher:
Release Date : 2008
Cholesteric Liquid Crystal Photonic Crystal Lasers And Photonic Devices written by Ying Zhou and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Lasers categories.
This dissertation discusses cholesteric liquid crystals (CLCs) and polymers based photonic devices including one-dimensional (1D) photonic crystal lasers and broadband circular polarizers. CLCs showing unique self-organized chiral structures have been widely used in bistable displays, flexible displays, and reflectors. However, the photonic band gap they exhibit opens a new way for generating laser light at the photonic band edge (PBE) or inside the band gap. When doped with an emissive laser dye, cholesteric liquid crystals provide distributed feedback so that mirrorless lasing is hence possible. Due to the limited surface anchoring, the thickness of gain medium and feedback length is tens of micrometers. Therefore lasing efficiency is quite limited and laser beam is highly divergent. To meet the challenges, we demonstrated several new methods to enhance the laser emission while reducing the beam divergence from a cholesteric liquid crystal laser. Enhanced laser emission is demonstrated by incorporating a single external CLC reflector as a polarization conserved reflector. Because the distributed feedback from the active layer is polarization selective, a CLC reflector preserves the original polarization of the reflected light and a further stimulated amplification ensues. As a result of virtually doubled feedback length, the output is dramatically enhanced in the same circular polarization state. Meanwhile, the laser beam divergence is dramatically reduced due to the increased cavity length from micrometer to millimeter scale. Enhanced laser emission is also demonstrated by the in-cell metallic reflector because the active layer is pumped twice. Unlike a CLC reflector, the output from a mirror-reflected CLC laser is linearly polarized as a result of coherent superposition of two orthogonal circular polarization states. The output linear polarization direction can be well controlled and fine tuned by varying the operating temperature and cell gap. Enhanced laser emission is further demonstrated in a hybrid photonic band edge - Fabry-Perot (FP) type structure by sandwiching the CLC active layer within a circular polarized resonator consisting of two CLC reflectors. The resonator generates multiple FP modes while preserving the PBE mode from the active layer. More importantly this band edge mode can be greatly enhanced by the external resonator under some conditions. Theoretical analysis is conducted based on 4x4 transfer matrix and scattering matrix and the results are consistent with our experimental observations. To make the CLC laser more compact and miniaturized, we have developed a flexible polymer laser using dye-doped cholesteric polymeric films. By stacking the mirror reflecting layer, the active layer and the CLC reflecting layer, enhanced laser emission was observed in opposite-handed circular polarization state, because of the light recycling effect. On the other hand, we use the stacked cholesteric liquid crystal films, or the cholesteric liquid crystals and polymer composite films to demonstrate the single film broadband circular polarizers, which are helpful for converting a randomly polarized light into linear polarization. New fabrication methods are proposed and the circular polarizers cover ~280 nm in the visible spectral range. Both theoretical simulation and experimental results are presented with a good match.
Carbon Nanotubes And Graphene For Photonic Applications
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Author : T. Wilkinson
language : en
Publisher: Elsevier Inc. Chapters
Release Date : 2013-08-31
Carbon Nanotubes And Graphene For Photonic Applications written by T. Wilkinson and has been published by Elsevier Inc. Chapters this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-08-31 with Technology & Engineering categories.
This chapter discusses the background knowledge and provides a literature review of carbon-nanotubes-based metamaterials and other nanophotonic devices we present in the chapter. The materials properties of carbon nanotubes are discussed, along with their possible application in producing metamaterials which display artificial optical properties. A detailed analysis of different types of metamaterials is presented, along with their theory and applications. The utilization of silicon nanopillars for producing photonic crystals and the enhanced reflection effects are discussed. Lastly, the theoretical background and designing of carbon nanotube forests-based Fresnel lenses are presented.
Photonic Crystals
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Author : Pankaj Kumar Choudhury
language : en
Publisher: BoD – Books on Demand
Release Date : 2019-10-09
Photonic Crystals written by Pankaj Kumar Choudhury and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-09 with Technology & Engineering categories.
The role of dielectric mirrors is very important in optics. These are used for several purposes like imaging, fabricating laser cavities, and so on. The basis for the propagation of photons in dielectric mediums is the same as electrons in solid crystals. If the electrons can be diffracted by a periodic potential well, photons could also be equally well diffracted by a periodic modulation of the refractive index of the medium. This idea led to the development of many new artificial photonic materials and optical micro- and nanostructures. Since the mechanism of light guidance is essentially due to the microstructural features of the medium, a wide variety of photonic structures, e.g., photonic band-gap fibers in 1D and photonic band-gap crystals in 2D and 3D, can be realized. Photonic Crystals - A Glimpse of the Current Research Trends essentially highlights the recent developments in the arena of photonic crystal research. It is expected to be useful for expert as well as novice researchers; the former group of readers would be abreast of recent research advancements, whereas the latter group would benefit from grasping knowledge delivered by expert scientists.
Photonic Crystals
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Author : Kurt Busch
language : en
Publisher: John Wiley & Sons
Release Date : 2006-05-12
Photonic Crystals written by Kurt Busch and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-05-12 with Science categories.
The majority of the contributions in this topically edited book stems from the priority program SPP 1113 "Photonische Kristalle" run by the Deutsche Forschungsgemeinschaft (DFG), resulting in a survey of the current state of photonic crystal research in Germany. The first part of the book describes methods for the theoretical analysis of their optical properties as well as the results. The main part is dedicated to the fabrication, characterization and modeling of two- and three-dimensional photonic crystals, while the final section presents a wide spectrum of applications: gas sensors, micro-lasers, and photonic crystal fibers. Illustrated in full color, this book is not only of interest to advanced students and researchers in physics, electrical engineering, and material science, but also to company R&D departments involved in photonic crystal-related technological developments.
Organic And Hybrid Photonic Crystals
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Author : Davide Comoretto
language : en
Publisher:
Release Date : 2015
Organic And Hybrid Photonic Crystals written by Davide Comoretto and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
This book provides a multidisciplinary perspective (ranging from chemistry to physics and biology) of the current research and applications of Organic and Hybrid Photonic Crystals. The authors detail the chemical and physical tools used to develop organic photonic crystals, explain methods for engineering new nano-structures, and propose novel physical phenomena or technological applications based on such materials. Organic and Hybrid Photonic Crystal lasers, sensors, photovoltaic devices and stimuli responsive devices are discussed.
Theoretical Foundations And Application Of Photonic Crystals
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Author : Alexander Vakhrushev
language : en
Publisher: BoD – Books on Demand
Release Date : 2018-04-04
Theoretical Foundations And Application Of Photonic Crystals written by Alexander Vakhrushev and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-04 with Technology & Engineering categories.
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.