Propagation Loss In Slow Light Photonic Crystal Waveguides
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Propagation Loss In Slow Light Photonic Crystal Waveguides
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Author : Sebastian Andreas Schulz
language : en
Publisher:
Release Date : 2012
Propagation Loss In Slow Light Photonic Crystal Waveguides written by Sebastian Andreas Schulz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Light categories.
Slow Light Photonic Crystal Line Defect Waveguides
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Author : Alexander Petrov
language : en
Publisher: Cuvillier Verlag
Release Date : 2008
Slow Light Photonic Crystal Line Defect Waveguides written by Alexander Petrov and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
Classical And Quantum Optical Properties Of Slow Light Photonic Crystal Waveguides
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Author :
language : en
Publisher:
Release Date : 2009
Classical And Quantum Optical Properties Of Slow Light Photonic Crystal Waveguides written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Photonic crystals are optical materials where patterning of dielectrics on sub-wavelength length scales creates unusual optical properties such as waveguides with propagation speeds much slower than the vacuum speed of light. In this thesis, I examine the classical and quantum optical properties of such structures, specifically the enhancement of photon emission rate from a single quantum dot embedded in the waveguide (the Purcell Effect) and extrinsic scattering from an injected waveguide mode due to fabrication imperfections. The photon emission rate is found to be significantly enhanced over a large bandwidth in slow light photonic crystal waveguides and I provide detailed results for optimizing the emission properties of a novel photonic crystal ridge waveguide to suite a given application. Using an incoherent scattering theory, I show how slow light propagation enhances extrinsic scattering from unavoidable manufacturing imperfections leading to back scattering and radiation loss that scale with the group velocity v_g, as v_g^{-2} and v_g^{-1} respectively. I then improve the modeling of scattering using a coherent, multiple scattering approach to explain the experimental observation of disordered resonances in slow light waveguide modes. The theoretical predictions show good agreement with experimental measurements. This document provides a thorough introduction to the properties and problems of slow light photonic crystal waveguides.
Slow Light Photonic Crystal Devices For High Speed Optical Signal Processing
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Author : Jan-Michael Brosi
language : en
Publisher: Karlsruher Institut Fur Technologie
Release Date : 2009
Slow Light Photonic Crystal Devices For High Speed Optical Signal Processing written by Jan-Michael Brosi and has been published by Karlsruher Institut Fur Technologie this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Technology (General) categories.
This book discusses design, modeling, and the characterization of slow-light photonic crystal waveguides. Guidelines are developed to obtain slow-light waveguides with broadband characteristics and with low disorder-induced losses. Three functional devices are proposed and studied: A tunable dispersion compensator, a tunable optical delay line, and a high-speed electro-optic modulator. Optical and microwave measurements confirm the designs.
Wide Band Low Dispersion Low Losses Slow Light In Photonic Crystal Waveguides
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Author : Ran Hao
language : en
Publisher:
Release Date : 2010
Wide Band Low Dispersion Low Losses Slow Light In Photonic Crystal Waveguides written by Ran Hao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
This Ph.D study brings contributions of solving present problems for slow light in photonic crystal waveguides, aiming to obtain wide-band, low-dispersion, and low losses slow light. Novel kinds of photonic crystal waveguides are proposed having large bandwidth, low group velocity dispersion and allowing a flexible control of slow light properties with reasonable requirements to clean room fabrication. An overall approach to improve the delay-bandwidth product of present slow light devices is proposed. By using this approach, the normalized delay-bandwidth product of previous waveguides has been improved by a factor of 15 if compared with regular photonic crystal waveguides with a group index maintained at the high value of 90. The fabrication induced losses have also been studied. We modeled four kinds of structure disorders in real fabrication. The obtained results quantify how much the region close to the line defect center has a dominant influence on the losses. Finally, all design results have been used for the fabrication of silicon-on-insulator samples prepared for the demonstration of the foreseen slow light effects.
Characteristics Of Defect Modes Slow Light And Disorder In Photonic Crystals
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Author : Michelle Lynn Povinelli
language : en
Publisher:
Release Date : 2004
Characteristics Of Defect Modes Slow Light And Disorder In Photonic Crystals written by Michelle Lynn Povinelli and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
(Cont.) Chapter 5 analyzes slow-light, band-edge waveguides for compact, integrated, tun- able optical time delays. Slow group velocities at the photonic band edge give rise to large changes in time delay for small changes in refractive index, shrinking device size. Figures of merit are defined for tuning sensitivity and signal dispersion. Exact calculations for a realistic, three-dimensional grating structure are shown to be well predicted by a simple quadratic-band model, simplifying device design. Chapter 6 derives a general, coupled-mode theory for disorder-induced scattering in strongly periodic systems. The analytical results allow the comparison of photonic- crystal waveguides to similar index-guided waveguides. In the realistic limit of weak disorder, reflections are identical while transmission is higher for the photonic-crystal waveguide. The general results, verified by direct numerical simulations in an example system, suggest a new mechanism for the design of low-loss waveguides.
Slow Light In Two Dimensional Semi Conductor Photonic Crystals
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Author : Patricio Grinberg
language : en
Publisher:
Release Date : 2012
Slow Light In Two Dimensional Semi Conductor Photonic Crystals written by Patricio Grinberg and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We report on the combination of slow light propagation with the resonance properties of a photonic crystal (PhC) cavity and with the slow mode of a PhC waveguide. We demonstrate theoretically and experimentally that slow light induced by the Coherent Population Oscillation (CPO) effect enables to have small-size and ultrahigh quality (Q) factor cavity, regardless of the technological and design issues. The experimental proof is performed in a L3 2D PhC cavity with semiconductor quantum wells as active, medium in which the CPO effect is induced. We achieve a cavity Q-factor of 520000, which corresponds to an enhancement by a factor 138 in comparison with the original Q-factor of the cavity. We present a theoretical approach to the combination of CPO-based slow light and slow mode in PhC waveguides, showing that the total group index is a multiplication of the group indices associated respectively to the CPO slow light and to the waveguide slow mode. We also set the basis for the experimental demonstration by designing and fabricating samples in the clean room facilities of LPN and addressing the challenging issue of coupling and extracting light in and from the waveguides. A particular design of the PhC in the waveguide is issued as a grating that allows to couple light perpendicularly to the plane of the PhC from free space. The vertical coupler has also been designed and fabricated along the waveguide and has been experimentally characterized. Slow light based on CPO effect in the PhC waveguides is always under experimental investigation.
Slow Light
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Author : Jacob B. Khurgin
language : en
Publisher: CRC Press
Release Date : 2018-10-08
Slow Light written by Jacob B. Khurgin and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-08 with Science categories.
One of the Top Selling Physics Books according to YBP Library Services The exotic effects of slow light have been widely observed in the laboratory. However, current literature fails to explore the wider field of slow light in photonic structures and optical fibers. Reflecting recent research, Slow Light: Science and Applications presents a comprehensive introduction to slow light and its potential applications, including storage, switching, DOD applications, and nonlinear optics. The book covers fundamentals of slow light in various media, including atomic media, semiconductors, fibers, and photonic structures. Leading authorities in such diverse fields as atomic vapor spectroscopy, fiber amplifiers, and integrated optics provide an interdisciplinary perspective. They uncover potential applications in both linear and nonlinear optics. While it is impossible to account for all the captivating developments that have occurred in the last few years, this book provides an exceptional survey of the current state of the slow light field.
Optical And Thermal Properties Of Periodic Photonic Structures On A Silicon On Insulator Platform
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Author : Weiwei Song
language : en
Publisher:
Release Date : 2013
Optical And Thermal Properties Of Periodic Photonic Structures On A Silicon On Insulator Platform written by Weiwei Song and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Photonics categories.
Silicon photonics is the leading candidate to fulfill the high bandwidth requirement for the future communication networks. Periodic photonic structures, due to their fascinating properties including compact size, high efficiency, and ease of design, play an important role in photonic systems. In this dissertation, SOI-based one-dimensional and two-dimensional periodic photonic structures are studied. Low crosstalk, high density integration of bus waveguides is demonstrated by employing a novel waveguide array structure. Inspired by the low coupling strength shown by initial pair waveguide experiments, novel waveguide array structures are studied by generalizing the nearest-neighbor tight-bonding model. Based on the theory, waveguide arrays have been designed and fabricated. The waveguide arrays have been characterized to demonstrate high density bus waveguides with minimal crosstalk. Two-dimensional photonic crystal waveguide (PCW) structure was then investigated aiming at reducing the propagation loss. A general cross-sectional eigenmode orthogonality relation is first derived for a one dimensional periodic system. Assisted by this orthogonality, analytic formulas are obtained to describe the propagation loss in PCW structures. By introducing the radiation and backscattering loss factors a1 and a2, the total loss coefficient a can be written as a=a1*ng+a2*ng^2 (ng is the group index). It is analytically shown the backscattering loss generally dominates the radiation loss for ng>10. Combined with systematic simulations of loss dependences on key structure parameters, this analytic study helps identify promising strategies to reduce the slow light loss. The influence of the substrate on the performance of a thermo-optic tuning photonic crystal device was studied in the following section. The substrate-induced thermo-optic tuning is obtained as a function of key physical parameters, based on a semi-analytic theory that agrees well with numeric simulations. It is shown that for some devices, the substrate's contribution to the thermo-optic tuning can exceed 10% for a heater located in the waveguide core and much higher for some other configurations. The slow response of the substrate may also significantly slow down the overall response time of the device. Strategies of minimizing the substrate's influence are discussed.
Photonic Crystals
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Author : Jean-Michel Lourtioz
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-03-19
Photonic Crystals written by Jean-Michel Lourtioz and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-03-19 with Science categories.
This book provides the theoretical background required for modelling photonic crystals and their optical properties, while presenting the large variety of devices where photonic crystals have found application. As such, it aims at building bridges between optics, electromagnetism and solid state physics. This second edition includes the most recent developments of two-dimensional photonic crystal devices, as well as some of the last results reported on metamaterials.