Download or read book A Liquid Lens Based on Electrowetting written by Jihwan Park and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 2D Liquid Lens Based on EWOD written by Maziar Ahmadi Zeidabadi and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: [ANGLÈS] This thesis presents the fabrication, development and characteristics of a liquid lens based on electrowetting. Essentially, when the lens is in liquid form, both its position and its curvature can be reversibly tuned through electrowetting. Variable focal length liquid microlenses are being used to create the next generation lenses for a wide variety of microelectromechanical systems (MEMS) and NEMS applications. In real-time operations, the application of a voltage causes the lens to change its focal length. The liquid lens recovers its initial focal length upon removal of the voltage. Taking a wettability mechanism approach, surface properties are determined by contact angles of different test liquids on the samples due to their unique surface energies [1]. To search out and examine the particularities, in an attempt to learn the facts about liquid lenses, electrowetting is incorporated into the design of a liquid lens in a certain fabrication plan. This electrowetting is considered to control and maintain the planar (2D) liquid lens shape and its position by applying potential between electrodes and ground through the conductive liquid. Based on this electrowetting, a planar liquid lens is designed, consisting of conductive liquid such as oil or water and substrate with specific pattern of electrodes. The conductive drop should be confined to the center position. The electrodes, covered by a hydrophobic layer, when applying electric potential on them (or some of them) help to change the shape and position of the droplet that forms the lens. The focal length of the lens also varies, according to different droplet dimensions.
Download or read book Contribution to Liquid Lens Technology written by Maziar Ahmadi Zeidabadi and published by . This book was released on 2016 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interest on microfluidic systems based on electrowetting-on-dielectric (EWOD) and the miniaturization of such integrated devices, has increased significantly mainly due to the advent of mass market applications such as lab-on-chip, liquid lenses and reflective displays. The main objective of this work focuses on the scientific and technological challenges that the fabrication and optimization of liquid lens faces. Those are mainly related to the materials used and their associated fabrication techniques, in order to have stable devices with high performance for long term functionality. The work reported here contributes the research to reduce the actuation voltage and to increase stability and reliability of electrowetting devices such as liquid lenses at laboratory scale. We address various aspects related to liquid lenses: (a), improvement of the hydrophobic layer deposition process leading contact angle recovery enhancement, (b) investigation of the dielectric materials and deposition techniques to reduce the required applied voltage (c) specific design of electrodes for 2D movement of the liquid lens, and (d) investigation of nonaqueous liquids to improve the dynamic behavior and long term cycling functionality. (e) An attempt is made to develop behavioral models that can explain EWOD phenomena with an electronic circuit software.
Download or read book Electrowetting Liquid Lens Oscillations for Optical Applications written by David Schipf and published by . This book was released on 2019 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ability to modulate the phase of a transmitted beam over space and time is valuable in optical systems. Adaptive optics systems, such as retina imaging systems, can require dynamic wavefront correction and shaping of coherent beams. A two liquid cell with dissimilar refractive indices and a user defined meniscus profile can modulate a wavefront with polarization insensitivity. This can be done in transmission, and with cost-effective materials, by controlling the meniscus profile with electrowetting. While the use of a static meniscus profile shape in electrowetting lenses is well documented, the use of oscillations on the meniscus profile has just recently begun to be explored. The superposition of electrowetting liquid lens oscillations can form an arbitrary profile for user defined wavefront correction or beam shaping. If only one electrode around the liquids is used, radially symmetric oscillations are present, while multiple electrodes enables asymmetric oscillation patterns. Models for the dynamics of an electrowetting liquid lens are given and discussed in this thesis. A method for measuring the liquid-liquid meniscus profile over space and time using digital holographic interferometry (DHI) is detailed. Measurements of a commercial electrowetting liquid lens driven from f[subscript]f=10-200 Hz are presented and analyzed. A frequency response is given, as well as an analysis of the oscillation frequencies and profile spatial spectrum. Non-linear effects that were observed at higher forcing amplitudes are noted. A new application application of an oscillating electrowetting liquid lenses in random phase mask optical image cryptography is also presented. Through the presentation of experimental, theoretical and numerical work, the usefulness of oscillating electrowetting lenses for optical applications is investigated.
Download or read book Microlenses written by Hongrui Jiang and published by CRC Press. This book was released on 2016-04-19 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to the development of microscale fabrication methods, microlenses are being used more and more in many unique applications, such as artificial implementations of compound eyes, optical communications, and labs-on-chips. Liquid microlenses, in particular, represent an important and growing research area yet there are no books devoted to this top
Download or read book Introduction to Adaptive Lenses written by Hongwen Ren and published by John Wiley & Sons. This book was released on 2012-04-24 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents readers with the basic science, technology, and applications for every type of adaptive lens An adaptive lens is a lens whose shape has been changed to a different focal length by an external stimulus such as pressure, electric field, magnetic field, or temperature. Introduction to Adaptive Lenses is the first book ever to address all of the fundamental operation principles, device characteristics, and potential applications of various types of adaptive lenses. This comprehensive book covers basic material properties, device structures and performance, image processing and zooming, optical communications, and biomedical imaging. Readers will find homework problems and solutions included at the end of each chapter—and based on the described device structures, they will have the knowledge to fabricate adaptive lenses for practical applications or develop new adaptive devices or concepts for advanced investigation. Introduction to Adaptive Lenses includes chapters on: Optical lenses Elastomeric membrane lenses Electro-wetting lenses Dielectrophoretic lenses Mechanical-wetting lenses Liquid crystal lenses This is an important reference for optical engineers, research scientists, graduate students, and undergraduate seniors.
Download or read book MEMS 2005 Miami written by and published by . This book was released on 2005 with total page 901 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tunable Micro optics written by Hans P. Zappe and published by Cambridge University Press. This book was released on 2016 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first comprehensive survey of state-of-the-art tunable micro-optics, covering advances in materials, components and systems.
Download or read book Management Information And Optoelectronic Engineering Proceedings Of The 2015 International Conference On Management Information And Communication And The 2015 International Conference On Optics And Electronics Engineering written by Yongsheng Gao and published by World Scientific. This book was released on 2016-04-28 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, Management Information and Optoelectronic Engineering, is a collection of papers presented at the 2015 International Conference on Management, Information and Communication and the 2015 International Conference on Optics and Electronics Engineering which was held on October 24-25, 2015 in Xia Men, China. The book provides state-of-the-art research results and development activities in Optics and Electronics Engineering, Management, Information and Communication and will benefit researchers and practitioners in the field.
Download or read book Optical MEMS Nanophotonics and Their Applications written by Guangya Zhou and published by CRC Press. This book was released on 2017-12-14 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers device design fundamentals and system applications in optical MEMS and nanophotonics. Expert authors showcase examples of how fusion of nanoelectromechanical (NEMS) with nanophotonic elements is creating powerful new photonic devices and systems including MEMS micromirrors, MEMS tunable filters, MEMS-based adjustable lenses and apertures, NEMS-driven variable silicon nanowire waveguide couplers, and NEMS tunable photonic crystal nanocavities. The book also addresses system applications in laser scanning displays, endoscopic systems, space telescopes, optical telecommunication systems, and biomedical implantable systems. Presents efforts to scale down mechanical and photonic elements into the nano regime for enhanced performance, faster operational speed, greater bandwidth, and higher level of integration. Showcases the integration of MEMS and optical/photonic devices into real commercial products. Addresses applications in optical telecommunication, sensing, imaging, and biomedical systems. Prof. Vincent C. Lee is Associate Professor in the Department of Electrical and Computer Engineering, National University of Singapore. Prof. Guangya Zhou is Associate Professor in the Department of Mechanical Engineering at National University of Singapore.
Download or read book Microlenses written by Hongrui Jiang and published by MDPI. This book was released on 2018-10-08 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a printed edition of the Special Issue "Microlenses" that was published in Micromachines
Download or read book Fabrication and Characterization of Flexible Electrowetting Microlens Array and Magnetically Actuated Lens with Tunable focus written by Kari Lucille Van Grinsven and published by . This book was released on 2019 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first sections of this report focus on flexible electrowetting on dielectric (EWOD) microlens array sheets. Each liquid lens of the array is individually tunable via EWOD actuation and is situated on a flexible polydimethylsiloxane (PDMS) substrate, which allows the lens array to operate as a reconfigurable optical system. We demonstrated fabrication of a fully flexible 5 x 5 array and verified actuation to center droplets over the electrodes, after which this work on a flexible EWOD microlens array was expanded and revised with a new fabrication method to improve robustness of the device. The extended work conducted full, optical characterizations of the resulting lenses and lens system to demonstrate its imaging capabilities. We observed a significant increase in the field of view (FOV) of the system to 40.4° by wrapping it on a cylindrical surface as compared to the FOV of 21.5° obtained by the array on a planer surface. We also characterized the liquid lenses of the system, observing a range of focus length from 20.2 mm to 9.2 mm as increased voltage was applied to each EWOD lens. A Shack-Hartmann wavefront sensor (SHWS) was used to measure the wavefront of the lens as it was actuated, and the aberrations of the lens were assessed by reporting the Zernike coefficients of the wavefronts. The final part of this work focuses on another kind of liquid lens, this one magnetically actuated. Here, instead of fabricating an array of microlenses, we focus our attention to a single, large (diameter equal to 15 mm) liquid lens. The lens is composed of two liquid chambers separated by a PDMS membrane, one filled with silicone oil and the other with water. The membrane deforms symmetrically in response to the Lorentz Force and is capable of achieving focal lengths from -111 mm to -305 mm when operating in the divergent regime and from 146 mm to 272 mm when operating in the convergent regime. We also characterized the aberration of the lens via a SHWS and observed changes in the shape of the wavefront produced by the lens as a function of voltage applied.
Download or read book Electrokinetics and Electrohydrodynamics in Microsystems written by Antonio Ramos and published by Springer Science & Business Media. This book was released on 2011-09-20 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Among the most promising techniques to handle small objects at the micrometer scale are those that employ electrical forces, which have the advantages of voltage-based control and dominance over other forces. The book provides a state-of-the-art knowledge on both theoretical and applied aspects of the electrical manipulation of colloidal particles and fluids in microsystems and covers the following topics: dielectrophoresis, electrowetting, electrohydrodynamics in microsystems, and electrokinetics of fluids and particles. The book is addressed to doctoral students, young or senior researchers, chemical engineers and/or biotechnologists with an interest in microfluidics, lab-on-chip or MEMS.
Download or read book Liquid Crystal Optical Device written by Leszek R. Jaroszewicz and published by MDPI. This book was released on 2020-01-03 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Special Issue “Liquid Crystal Optical Devices” discusses recent developments in the rapidly advancing subject of liquid crystals (LCs). The book is composed of several contributions from researchers in the field of liquid crystals that deal with the broadly with aspects of optical devices ranging from a theoretical viewpoints to practical implications of the properties of LCs. This is the first Special Issue devoted solely to recent advances in the rapidly expanding subject of LCs, a unique class of substances that combines both ordered structures with quasi-liquid-like properties. This Special Issue offers a broad perspective of the present state of the art in design and an up-to-date account of the most recent advances and progress in the field of LCs, providing thorough coverage of the demonstrated optical devices and the comprehensive analysis needed by professionals and engineers in the field of LC. The material is carefully structured, providing readers with a solid foundation of the principles, capabilities, use, and limitations of LC optical devices. In addition, this book covers the principles, recent advances and future developments of liquid crystal beam steering devices as well as recent advances in adaptive liquid crystal lenses.
Download or read book Understanding MEMS written by Luis Castañer and published by John Wiley & Sons. This book was released on 2015-10-06 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: The continued advancement of MEMS (micro-electro-mechanical systems) complexity, performance, commercial exploitation and market size requires an ever-expanding graduate population with state-of-the-art expertise. Understanding MEMS: Principles and Applications provides a comprehensive introduction to this complex and multidisciplinary technology that is accessible to senior undergraduate and graduate students from a range of engineering and physical sciences backgrounds. Fully self-contained, this textbook is designed to help students grasp the key principles and operation of MEMS devices and to inspire advanced study or a career in this field. Moreover, with the increasing application areas, product categories and functionality of MEMS, industry professionals will also benefit from this consolidated overview, source of relevant equations and extensive solutions to problems. Key features: Details the fundamentals of MEMS, enabling readers to understand the basic governing equations and know how they apply at the micron scale. Strong pedagogical emphasis enabling students to understand the fundamentals of MEMS devices. Self-contained study aid featuring problems and solutions. Book companion website hosts Matlab and PSpice codes and viewgraphs.
Download or read book Smart Mini Cameras written by Tigran V. Galstian and published by CRC Press. This book was released on 2013-09-24 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: Achieve the Best Camera Design: Up-to-Date Information on MCMs Miniature camera modules (MCMs), such as webcams, have rapidly become ubiquitous in our day-to-day devices, from mobile phones to interactive TV systems. MCMs—or "smart" cameras—can zoom, adjust their frame rate automatically with illumination change, focus at different distances, compensate for hand shake, and transform captured images. With contributions from academics and field engineers, Smart Mini-Cameras discusses the structure, operation principles, applications, and future trends of miniature mobile cameras. It compares this technology with traditional digital still cameras and explains the specific requirements of MCM components (imposed by the size or type of application) in terms of optical design, image sensor, and functionalities. The book describes the implementation of several active functionalities, including liquid crystal auto focus (AF) and optical image stabilization (OIS). It also explores how new technologies, such as the curved detector and transforming optics, are stimulating novel trends, including a miniature panoramic lens on mobile phones. By providing you with an understanding of the components and performance tradeoffs of MCMs, this book will help you achieve the best camera design. It also answers frequently asked questions, such as the importance of the number of megapixels in a mobile phone camera and the value of AF and OIS features.
Download or read book Microdroplet Technology written by Philip Day and published by Springer Science & Business Media. This book was released on 2012-07-28 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microdroplet technology has recently emerged to provide new and diverse applications via microfluidic functionality, especially in various areas of biology and chemistry. This book, then, gives an overview of the principle components and wide-ranging applications for state-of-the-art of droplet-based microfluidics. Chapter authors are internationally-leading researchers from chemistry, biology, physics and engineering that present various key aspects of micrdroplet technology -- fundamental flow physics, methodology and components for flow control, applications in biology and chemistry, and a discussion of future perspectives. This book acts as a reference for academics, post-graduate students, and researcher wishing to deepen their understand of microfluidics and introduce optimal design and operation of new droplet-based microfluidic devices for more comprehensive analyte assessments.
