Optical Properties of Organic Thin Films and Waveguides Fabricated by OMBD PDF Download
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Author: Venkatrshwar Rao Gangilenka
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Book Description
Author: Venkatrshwar Rao Gangilenka
Publisher:
ISBN:
Category :
Languages : en
Pages : 151
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Book Description
Author: Niranjala D. Wickremasinghe
Publisher:
ISBN:
Category :
Languages : en
Pages : 146
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Book Description
In this thesis, the optical properties of tris (8-hydroxyquinoline) aluminum (Alq3) and 3,5,9,10-perylentetracarboxylic dianhydride (PTCDA) organic films, PTCDA/ Alq3 multilayers and plasmonic Alq3-metal waveguides are investigated. The organic films and heterostructures used for this work were fabricated by organic molecular beam deposition (OMBD). We investigated the quenching of the light emission in Alq3 films grown on a Si substrate as a function of cw laser excitation intensity at varying temperatures from 15 to 300 K. The saturation of the singlet-singlet annihilation coefficient was measured with spectrally-integrated (SI) photoluminescence (PL) using a photodiode. The bimolecular quenching coefficient was further studied with time-resolved (TR) PL as a function of 100 fs pulse fluences. The PL quenching is attributed to the annihilation of trapped excitons at Alq3 nanocrystal grain boundaries. The saturation is explained by the limited density of available trapping states at the grain boundaries. Our interpretation is supported by structural investigations of ultrathin Alq3 films with atomic force microscopy (AFM), scanning electron microscopy (SEM) and by comparing the experimental data with calculations using a coupled rate equation model. The wavelength dispersion of the refractive indices of PTCDA and Alq3 layers and of PTCDA/Alq3 multilayer waveguides grown on Pyrex substrates was investigated. The m-line technique, an evanescent prism coupling technique, was used to determine the layers' thickness and the in-plane (TE modes) and normal (TM modes) refractive indices. The potential for controlling the refractive index dispersion and anisotropy by tailored organic multilayer waveguides is discussed.
Author: Spencer Lewis Buckner
Publisher:
ISBN:
Category : Solar cells
Languages : en
Pages : 244
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Book Description
Author: Kang Il Seo
Publisher:
ISBN:
Category : Thin films
Languages : en
Pages : 292
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Book Description
Author: Brijesh Iyer
Publisher: Springer
ISBN: 9789811315121
Category : Technology & Engineering
Languages : en
Pages : 1041
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Book Description
This book highlights cutting-edge research on various aspects of human–computer interaction (HCI). It includes selected research papers presented at the Third International Conference on Computing, Communication and Signal Processing (ICCASP 2018), organized by Dr. Babasaheb Ambedkar Technological University in Lonere-Raigad, India on January 26–27, 2018. It covers pioneering topics in the field of computer, electrical, and electronics engineering, e.g. signal and image processing, RF and microwave engineering, and emerging technologies such as IoT, cloud computing, HCI, and green computing. As such, the book offers a valuable guide for all scientists, engineers and research students in the areas of engineering and technology.
Author: Chandra Sekhar Rout
Publisher: Woodhead Publishing
ISBN: 0081025785
Category : Science
Languages : en
Pages : 512
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Book Description
Fundamentals and Sensing Applications of 2D Materials provides a comprehensive understanding of a wide range of 2D materials. Examples of fundamental topics include: defect and vacancy engineering, doping and advantages of 2D materials for sensing, 2D materials and composites for sensing, and 2D materials in biosystems. A wide range of applications are addressed, such as gas sensors based on 2D materials, electrochemical glucose sensors, biosensors (enzymatic and non-enzymatic), and printed, stretchable, wearable and flexible biosensors. Due to their sub-nanometer thickness, 2D materials have a high packing density, thus making them suitable for the fabrication of thin film based sensor devices. Benefiting from their unique physical and chemical properties (e.g. strong mechanical strength, high surface area, unparalleled thermal conductivity, remarkable biocompatibility and ease of functionalization), 2D layered nanomaterials have shown great potential in designing high performance sensor devices. Provides a comprehensive overview of 2D materials systems that are relevant to sensing, including transition metal dichalcogenides, metal oxides, graphene and other 2D materials system Includes information on potential applications, such as flexible sensors, biosensors, optical sensors, electrochemical sensors, and more Discusses graphene in terms of the lessons learned from this material for sensing applications and how these lessons can be applied to other 2D materials
Author: Ray T. Chen
Publisher: Morgan & Claypool Publishers
ISBN: 1598290665
Category : Integrated circuits
Languages : en
Pages : 105
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Book Description
This book describes fully embedded board level optical interconnect in detail including the fabrication of the thin-film VCSEL array, its characterization, thermal management, the fabrication of optical interconnection layer, and the integration of devices on a flexible waveguide film. All the optical components are buried within electrical PCB layers in a fully embedded board level optical interconnect. Therefore, we can save foot prints on the top real estate of the PCB and relieve packaging difficulty reduced by separating fabrication processes. To realize fully embedded board level optical interconnects, many stumbling blocks need to be addressed such as thin-film transmitter and detector, thermal management, process compatibility, reliability, cost effective fabrication process, and easy integration. The material presented eventually will relieve such concerns and make the integration of optical interconnection highly feasible. The hybrid integration of the optical interconnection layer and electrical layers is ongoing.
Author: Minghua Xu
Publisher: CRC PressI Llc
ISBN: 9781439882245
Category : Technology & Engineering
Languages : en
Pages : 400
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Book Description
Author: William S. C. Chang
Publisher: Cambridge University Press
ISBN: 1139439685
Category : Science
Languages : en
Pages : 423
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Book Description
In many applications, radio frequency (RF) signals need to be transmitted and processed without being digitalized. Optical fiber provides a transmission medium in which RF modulated optical carriers can be transmitted and distributed with very low loss, making it more efficient and less costly than conventional electronic systems. This volume presents a review of RF photonic components, transmission systems, and signal processing examples in optical fibers from leading academic, government, and industry scientists working in this field. It also introduces the reader to various related technologies such as direct modulation of laser sources, external modulation techniques, and detectors. The text is aimed at engineers and scientists engaged in the research and development of optical fibers and analog RF applications. With an emphasis on design, performance and practical application, this book will be of particular interest to those developing systems based on this technology.
Author: Sudhā Mūrti
Publisher: Penguin Books India
ISBN: 9780143330066
Category : Children's stories, Indic (English)
Languages : en
Pages : 164
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Book Description
A princess thinks she was a bird, a coconut that cost a thousand rupees, and a shepherd with a bag of words...Kings and misers, princes and paupers, wise men and foolish boys, the funniest and oddest men and women come alive in this sparkling new collection of stories. The clever princess will only marry the man who can ask her a question she cannot answer; the orphan boy outwits his greedy uncles with a bag of ash; and an old couple in distress is saved by a magic drum. Sudha Murty's grandparents told her some of these stories when she was a child; others she heard from her friends from around the world. These delightful and timeless folktales have been her favourites for years, and she has recounted them many times over to the young people in her life. With this collection, they will be enjoyed by many more readers, of all ages. Age group of target audience is 8+.
