Resonant Cavity Enhanced Photodetectors for High-speed and Polarization-sensing Applications PDF Download

Author: Bora M. Onat
Publisher:
ISBN:
Category : Cavity resonators
Languages : en
Pages : 280

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Author:
Publisher: Woodhead Publishing
ISBN: 1782424687
Category : Science
Languages : en
Pages : 551

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Book Description
Photodetectors: Materials, Devices and Applications discusses the devices that convert light to electrical signals, key components in communication, computation, and imaging systems. In recent years, there has been significant improvement in photodetector performance, and this important book reviews some of the key advances in the field. Part one covers materials, detector types, and devices, and includes discussion of silicon photonics, detectors based on reduced dimensional charge systems, carbon nanotubes, graphene, nanowires, low-temperature grown gallium arsenide, plasmonic, Si photomultiplier tubes, and organic photodetectors, while part two focuses on important applications of photodetectors, including microwave photonics, communications, high-speed single photon detection, THz detection, resonant cavity enhanced photodetection, photo-capacitors and imaging. Reviews materials, detector types and devices Addresses fabrication techniques, and the advantages and limitations and different types of photodetector Considers a range of application for this important technology Includes discussions of silicon photonics, detectors based on reduced dimensional charge systems, carbon nanotubes, graphene, nanowires, and more

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5

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We report spectral and high-speed measurement results on resonant cavity enhanced (RCE) Schottky photodiodes. The Schottky metal contact is semi-transparent and provides the top mirror reflectivity. We demonstrated by simulations that the detector responsivity can be optimized by using a dielectric coating on top of the metal contact. The novel concept of combining a dielectric impedance matching layer with the semi-transparent metal mirror drastically improves the expected quantum efficiency of RCE Schottky photodiodes. Simulations in GaAs/InGaAs material system predicted more than 70% quantum efficiency for an absorbing region of O.13um. The devices were fabricated by using a microwave compatible process. On-wafer high-speed measurements yielded a 18 Ps pulse width corresponding to a 3-dB bandwidth of 20 GHz. We also report on our efforts on polarization sensing photodetectors.

Author: Hari Singh Nalwa
Publisher: Elsevier
ISBN: 032313789X
Category : Science
Languages : en
Pages : 575

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Book Description
Photodetectors and Fiber Optics is an outgrowth of the recently published 10-volume set Handbook of Advanced Electronic and Photonic Materials and Devices. The objective of this book is to present a highly coherent coverage of photodetectors and optical fibers. This book overs a broad spectrum of photodetectors, including types of materials, their fabrication, physical properties, and industrial applications. Many industries around the world are engaged in developing fiber optics technology for the new millennium. The applications of photodetectors in fiber optics and the role of optical fibers in present communication technology are extensively discussed. - Covers a broad spectrum of the photodetectors - Include types of materials, their fabrication, physical properties and industrial applications - Applications of photodetectors in fiber optics - Role of optical fibers in present communication technology - A very special topic presented in a timely manner and in a format

Author: Gianluca Gagliardi
Publisher: Springer
ISBN: 3642400035
Category : Science
Languages : en
Pages : 537

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The book reviews the dramatic recent advances in the use of optical resonators for high sensitivity and high resolution molecular spectroscopy as well as for chemical, mechanical and physical sensing. It encompasses a variety of cavities including those made of two or more mirrors, optical fiber loops, fiber gratings and spherical cavities. The book focuses on novel techniques and their applications. Each chapter is written by an expert and/or pioneer in the field. These experts also provide the theoretical background in optics and molecular physics where needed. Examples of recent breakthroughs include the use of frequency combs (Nobel prize 2005) for cavity enhanced sensing and spectroscopy, the use of novel cavity materials and geometries, the development of optical heterodyne detection techniques combined to active frequency-locking schemes. These methods allow the use and interrogation of optical resonators with a variety of coherent light sources for trace gas detection and sensing of strain, temperature and pressure.

Author: Jianfei Wang (Ph. D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 172

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Book Description
Multispectral infrared (IR) detection has been widely employed for numerous applications including hyperspectral imaging, IR spectroscopy, and target identification. Traditional multispectral detection technology is based on the combination of broadband focal plane arrays (FPA) and spectral filters, grating spectrometers, or Fourier transform spectrometers, which requires bulky, high-cost mechanical scanning instruments and have a slow response. Hybrid structures integrating FPA and silicon readout integrated circuits (Si ROIC) greatly limit the yield and result in extremely expensive devices. Single photodetectors capable of detecting multiple wavebands simultaneously and monolithic integration with Si ROIC, however, enable dramatically simplified system design with superior mechanical robustness, and thus attract a lot of interest around the world today. In this thesis, we focus on the development of novel IR sensitive material and resonant-cavity- enhanced (RCE) photodetector devices that address the emerging need in the field of IR radiation detection. Polycrystalline PbTe films have been identified as the IR absorbing layers due to their high photosensitivity and fabrication flexibility; on the device side, we have established a universal design theory for multispectral detection and demonstrated fully functional mid-IR RCE photodetectors capable of monolithic integration with Si ROIC. We have developed room-temperature-sensitized, polycrystalline PbTe films using single source thermal evaporation for detecting IR light up to 5 pm in wavelength. Thinner PbTe layers yields enhanced performance than thicker layers due to strong thickness dependence of both photo-responsivity and detectivity. Structural, electrical, and optical property studies reveal photoconductivity mechanism in the films and point out directions of further material optimization. We have established a versatile and scalable design theory for cavity-enhanced multispectral photodetectors using phase-tuned propagation. Critical coupling condition is identified as the prerequisite to achieve near unity quantum efficiency in RCE photodetectors. Coupling-matching layers are positioned between cascaded planar resonant cavities for controlling optical phase and coupling strength between incident light and resonant modes to obtain critical coupling condition. After developing another two IR transparent layers as low and high index materials, evaporated As2S3 and sputtered Ge, we design and fabricate distributed Bragg reflectors (DBR) for mid-IR resonant cavities. In our design example of dual waveband RCE photodetectors, peak quantum efficiencies over 80% have been realized in both wavebands (1.55 pm and 3.6 pm) with only 50 nm and 100 nm thick PbTe IR absorbers, and spectral cross talk as low as 0.1% is obtained. Preliminary results on our first attempt of fabricated dual waveband RCE photodetectors demonstrate the two resonant cavity modes at 1.61 pm and 3.70 pm. And quantum efficiencies as high as 92% and 68% have been achieved in two wavebands respectively. We have developed and optimized a multi-step lift-off patterning technique to fabricate RCE photodetectors on a Si platform. Single waveband RCE photodetectors for mid-IR (3.5 pm) have been designed according to critical coupling condition to achieve near unity quantum efficiency. The fabricated devices show high quantum efficiency (90%) and peak responsivity at the resonant wavelength of 3.5 pm, which is 13.4 times higher than blanket PbTe film of the same thickness. We demonstrate detectivity as high as 0.72x0 cmHzmW~l, comparable with commercial polycrystalline mid-IR photodetectors. As low temperature processing (150 'C) is accomplished in the entire fabrication process, this demonstration paves the way for monolithic integration of RCE photodetectors with Si ROIC. Lastly, for the first time, we fabricate and test integrated devices of single waveband (3.6 pm) RCE photodetectors and Si ROIC. Both hybrid and monolithic integration structures are investigated. We have developed the fabrication process to accommodate Si ROIC chips of only 3 mm x 5 mm in area, and successfully integrated RCE photodetectors on Si ROIC directly. Our preliminary results show high promise for monolithic integration of RCE photodetectors and Si ROIC in the future.

Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 652

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Author: Olufemi Isiade Dosunmu
Publisher:
ISBN:
Category :
Languages : en
Pages : 300

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Book Description
Abstract: In this work we have designed and fabricated resonant cavity enhanced (RCE) germanium-on-silicon (Ge-on-Si) photodetectors, operating around the 1550 nm wavelength for applications in long-haul communications. Without sacrificing bandwidth, the spectral response of the Ge photodetector is enhanced by fabricating the Ge detector within a Fabry-Perot cavity, where the Ge active region is grown atop one or two-period silicon-on-insulator (SOI) substrates designed for maximum reflectivity (>80%) in the 1300 nm-1600 nm wavelength range. The responsivity of these Ge/SOI RCE photodetectors around 1550 nm is further enhanced by the increased absorption coefficient due to the tensile strain-induced bandgap narrowing effect within the Ge film. Detector bandwidths approaching 13 GHz and quantum efficiencies of nearly 60% have been measured around 1550 nm, which demonstrates the compatibility of these Ge/SOI photodetectors with 10 Gb/s data communication systems. In addition, the measured full-width at half-maximum (FWHM) of the spectral resonant peak is approximately 50 nm, encompassing the entire C-band wavelength range (1528 nm-1565 nm) used in long-haul optical communications, making these high-speed Ge detectors ideal for integration with WDM-based telecommunication systems. To the author's knowledge, these detectors are the fastest, most efficient Ge photodetectors fabricated directly on Si and optimized for 1550 nm operation.

Author:
Publisher:
ISBN:
Category : Aerodynamic measurements
Languages : en
Pages : 782

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Book Description

Author: Anatoly V. Zayats
Publisher: John Wiley & Sons
ISBN: 111863442X
Category : Science
Languages : en
Pages : 266

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Book Description
This book, edited by two of the most respected researchers in plasmonics, gives an overview of the current state in plasmonics and plasmonic-based metamaterials, with an emphasis on active functionalities and an eye to future developments. This book is multifunctional, useful for newcomers and scientists interested in applications of plasmonics and metamaterials as well as for established researchers in this multidisciplinary area.