Introduction to the Special Issue on Biophotonics—Part 2
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Two-Dimensional Spatio-Temporal Signal Processing for Dispersion Compensation in Time- Stretched ADC
UCLA UCLA Previously Published Works Title Two-dimensional spatio-temporal signal processing for dispersion compensation in time- stretched ADC Permalink https://escholarship.org/uc/item/1p65n9cp Journal Journal of Lightwave Technology, 25 ISSN 0733-8724 Authors Tarighat, Alireza Gupta, Shalabh Sayed, Ali H. et al. Publication Date 2007-06-01 Peer reviewed eScholarship.org Powered by the California Digital Library University of California 1580 JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 25, NO. 6, JUNE 2007 Two-Dimensional Spatio-Temporal Signal Processing for Dispersion Compensation in Time-Stretched ADC Alireza Tarighat, Member, IEEE, Shalabh Gupta, Student Member, IEEE, Ali H. Sayed, Fellow, IEEE, and Bahram Jalali, Fellow, IEEE Abstract—Time-stretched analog-to-digital converters (ADCs) have offered revolutionary enhancements in the performance of electronic converters by reducing the signal bandwidth prior to digitization. An inherent limitation of the time-stretched ADC is the frequency-selective response of the optical system that reduces the effective number of bits for ultrawideband signals. This paper proposes a solution based on spatio-temporal digital processing. The digital algorithm exploits the optical phase diversity to create a flat RF frequency response, even when the system’s transfer function included deep nulls within the signal spectrum. For a 10× time-stretch factor with a 10-GHz input signal, simulations show that the proposed solution increases the overall achievable signal-to-noise-and-distortion ratio to 52 dB in the presence of linear distortions. The proposed filter can be used to mitigate the Fig. 1. TS-ADC concept. dispersion penalty in other fiber optic applications as well. Index Terms—Analog-to-digital conversion (ADC), optical sig- a parallel array of slow digitizers, each clocked at a fraction nal processing, spatio-temporal digital processing, time-stretched of the Nyquist rate. -
Chemical Engineering Education Graduate Education in Chemical Engineering
I • N • D • E • X GRADUATE EDUCATION ADVERTISEMENTS Akron, Uni versity of. .......... , .... ... .................. 321 Iowa State Uni versity .................. ... ....... ....... 360 Pensylvania State Uni versity ........................ 395 Alabama, University of ................................ 322 Johns Hopkins University .... .... .. .... .... .......... 361 Pittsburgh, University of .............................. 396 Alabama, Huntsville; Uni versity of.. .... .. ..... 323 Kansas, University of ............................... .... 362 Polytechnic University .. .... ... .... ........... .. ..... .. 397 Alberta, Uni versity of .. ........ .... .. .... ... ..... ..... .. 324 Kansas State University ............... ... ...... ........ 363 Princeton University ....................... .......... .. .. 398 Arizona, University of ....... .. .... .. .... ... .. ... ....... 325 Kentucky, Uni versity of ........................ .. ..... 364 Purdue University .. ........... ... ... ....... ... .... .... ... 399 Arizona State University ..... .. ... ...... ..... ......... 326 Lamar University .. ... ..... ..... ......... ........... .. ..... 430 Rensselaer Polytechnic Institute .... ...... .... ... .. 400 Auburn Uni versity .. ..... .. ... ..... .. .............. .... ... 327 Laval Universite ...................... ........... ...... .. .. 365 Rhode Island, University of.. .... ..... .. ... ..... .. ... 435 Bri gham Young Uni versity .............. ... .. ..... ... 427 Lehigh University .................................. .... ... 366 Rice University -
Quantum Optics with Giant Atoms – the First Five Years
Quantum optics with giant atoms – the first five years Anton Frisk Kockum Abstract In quantum optics, it is common to assume that atoms can be approximated as point-like compared to the wavelength of the light they interact with. However, recent advances in experiments with artificial atoms built from superconducting circuits have shown that this assumption can be violated. Instead, these artificial atoms can couple to an electromagnetic field at multiple points, which are spaced wavelength distances apart. In this chapter, we present a survey of such systems, which we call giant atoms. The main novelty of giant atoms is that the multiple coupling points give rise to interference effects that are not present in quantum optics with ordinary, small atoms. We discuss both theoretical and experimental results for single and multiple giant atoms, and show how the interference effects can be used for interesting applications. We also give an outlook for this emerging field of quantum optics. Key words: Quantum optics, Giant atoms, Waveguide QED, Relaxation rate, Lamb shift, Superconducting qubits, Surface acoustic waves, Cold atoms 1 Introduction Natural atoms are so small (radius r ≈ 10−10 m) that they can be considered point- like when they interact with light at optical frequencies (wavelength λ ≈ 10−6 − 10−7 m)[1]. If the atoms are excited to high Rydberg states, they can reach larger sizes (r ≈ 10−8 − 10−7 m), but quantum-optics experiments with such atoms have them interact with microwave radiation, which has much longer wavelength (λ ≈ arXiv:1912.13012v1 [quant-ph] 30 Dec 2019 10−2 −10−1 m)[2]. -
Merging Photonics and Artificial Intelligence at the Nanoscale
Intelligent Nanophotonics: Merging Photonics and Artificial Intelligence at the Nanoscale Kan Yao1,2, Rohit Unni2 and Yuebing Zheng1,2,* 1Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA 2Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA *Corresponding author: [email protected] Abstract: Nanophotonics has been an active research field over the past two decades, triggered by the rising interests in exploring new physics and technologies with light at the nanoscale. As the demands of performance and integration level keep increasing, the design and optimization of nanophotonic devices become computationally expensive and time-inefficient. Advanced computational methods and artificial intelligence, especially its subfield of machine learning, have led to revolutionary development in many applications, such as web searches, computer vision, and speech/image recognition. The complex models and algorithms help to exploit the enormous parameter space in a highly efficient way. In this review, we summarize the recent advances on the emerging field where nanophotonics and machine learning blend. We provide an overview of different computational methods, with the focus on deep learning, for the nanophotonic inverse design. The implementation of deep neural networks with photonic platforms is also discussed. This review aims at sketching an illustration of the nanophotonic design with machine learning and giving a perspective on the future tasks. Keywords: deep learning; (nano)photonic neural networks; inverse design; optimization. 1. Introduction Nanophotonics studies light and its interactions with matters at the nanoscale [1]. Over the past decades, it has received rapidly growing interest and become an active research field that involves both fundamental studies and numerous applications [2,3]. -
Optoelectronics – the Science and Technology at the Heart Cure St of 21 Century Telecommunications
Higher Physics Topical Investigation Skin Cancer—Prevention and Optoelectronics – the science and technology at the heart Cure st of 21 century telecommunications 2 Researching Physics Higher Investigation Brief Suntan creams stop harmful UV radiation reaching the skin. Manufacturers’ products are rated with a Sun Protection Factor (SPF). Suntan creams can have SPF values from 6 to over 50. UV radiation monitors normally measure Higher Physics Researching Physics Optoelectronics – the science and technology at the heart of 21st century telecommunications Contents Advice to students Page 3 Overview of the unit and activities Page 4 Organising your work and carrying out the activities Page 5 Assessment issues Web-based research briefs Page 6 Initial research activity - Optoelectronics devices – what are they? Page 7 Research activity 1 - Light Emitting Diodes Page 8 Research activity 2 - Optical Fibres Page 9 Research activity 3 - Liquid Crystal Displays Practical investigation briefs Page 10 Research activity 1A - Investigating LEDs and Colour Page 11 Research activity 1B - Investigating LEDs and Brightness Page 12 Research activity 1C - Investigating the Spectra of LEDs Page 13 Research activity 1D - Investigating the Energy Use of Light Sources Page 14 Research activity 2A - Investigating Optical Fibres and Bending Page 15 Research activity 2B - Investigating Optical Fibres and Length Page 16 Research activity 3A - Investigating Polarisation Page 17 Research activity 3B - Investigating Polarisation using a Liquid Crystal Shutter Page 18 Research activity 3C - Investigating Colour Mixing Page 19 Further Information Page 2 Higher Physics Researching Physics Optoelectronics – the science and technology at the heart of 21st century telecommunications Overview of the unit and activities. -
Up-And-Coming Physical Concepts of Wireless Power Transfer
Up-And-Coming Physical Concepts of Wireless Power Transfer Mingzhao Song1,2 *, Prasad Jayathurathnage3, Esmaeel Zanganeh1, Mariia Krasikova1, Pavel Smirnov1, Pavel Belov1, Polina Kapitanova1, Constantin Simovski1,3, Sergei Tretyakov3, and Alex Krasnok4 * 1School of Physics and Engineering, ITMO University, 197101, Saint Petersburg, Russia 2College of Information and Communication Engineering, Harbin Engineering University, 150001 Harbin, China 3Department of Electronics and Nanoengineering, Aalto University, P.O. Box 15500, FI-00076 Aalto, Finland 4Photonics Initiative, Advanced Science Research Center, City University of New York, NY 10031, USA *e-mail: [email protected], [email protected] Abstract The rapid development of chargeable devices has caused a great deal of interest in efficient and stable wireless power transfer (WPT) solutions. Most conventional WPT technologies exploit outdated electromagnetic field control methods proposed in the 20th century, wherein some essential parameters are sacrificed in favour of the other ones (efficiency vs. stability), making available WPT systems far from the optimal ones. Over the last few years, the development of novel approaches to electromagnetic field manipulation has enabled many up-and-coming technologies holding great promises for advanced WPT. Examples include coherent perfect absorption, exceptional points in non-Hermitian systems, non-radiating states and anapoles, advanced artificial materials and metastructures. This work overviews the recent achievements in novel physical effects and materials for advanced WPT. We provide a consistent analysis of existing technologies, their pros and cons, and attempt to envision possible perspectives. 1 Wireless power transfer (WPT), i.e., the transmission of electromagnetic energy without physical connectors such as wires or waveguides, is a rapidly developing technology increasingly being introduced into modern life, motivated by the exponential growth in demand for fast and efficient wireless charging of battery-powered devices. -
Technology and Economic Assessment of Optoelectronics
NBSIR-86/3369 A111DE M 3 b 2 7 3 PLANNING REPORT Technology and Economic Assessment of Optoelectronics Gregory Tassey Senior Economist National Bureau of Standards October 1985 100 • U56 86-3369 1985 C. 2 ww BttAtCN mPMMAEQS CEHTQ PLANNING REPORT 23 TECHNOLOGY AND ECONOMIC ASSESSMENT OF OPTOELECTRONICS Gregory Tassev Senior Economist National Bureau of Standards October 1985 ABSTRACT Optoelectronics is one of the two major technologies driving the revolution in communications, which will not only have profound effects on the economy but on social and political structures as well. The other technology, optical fibers, is already beginning to mature, but optoelectronics is rapidly catching ud, enabling the acceleration of the "information age". Future productivity advances in optoelectronics will come from integration of the various signal processing functions and from improved manufacturing technologies . Integration may occur in two important stages. The first, referred to "hybrid" integration, is almost at the point of commercialization. Hybrid devices use oxide-based (ceramic) materials and integrate some of the signal processing functions. Total or "monolithic" integration, based on gallium arsenide and related materials may not reach commercialization for another 8-10 years. In both cases, the economic impact will be substantial as information technologies become a critical element of most industries. As a result, the U.S. and its major competitors, especially Japan, are making major R&D investments in optoelectronics. Worldwide R&D expenditures are expected to reach $1 billion by 1987. In terms of market penetration, fiberoptic systems will attain annual sales of more than S3 billion by 1989. The Japanese have made a national commitment to becoming the world leader in this market, borrowing from their substantial expertise in semiconductor technology. -
DNA Nanotechnology Meets Nanophotonics
DNA nanotechnology meets nanophotonics Na Liu 2nd Physics Institute, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart, Germany Email: [email protected] Key words: DNA nanotechnology, nanophotonics, DNA origami, light matter interactions Call-out sentence: It will be very constructive, if more research funds become available to support young researchers with bold ideas and meanwhile allow for failures and contingent outcomes. The first time I heard the two terms ‘DNA nanotechnology’ and ‘nanophotonics’ mentioned together was from Paul Alivisatos, who delivered the Max Planck Lecture in Stuttgart, Germany, on a hot summer day in 2008. In his lecture, Paul showed how a plasmon ruler containing two metallic nanoparticles linked by a DNA strand could be used to monitor nanoscale distance changes and even the kinetics of single DNA hybridization events in real time, readily correlating nanoscale motion with optical feedback.1 Until this day, I still vividly remember my astonishment by the power and beauty of these two nanosciences, when rigorously combined together. In the past decades, DNA has been intensely studied and exploited in different research areas of nanoscience and nanotechnology. At first glance, DNA-based nanophotonics seems to deviate quite far from the original goal of Nadrian Seeman, the founder of DNA nanotechnology, who hoped to organize biological entities using DNA in high-resolution crystals. As a matter of fact, DNA-based nanophotonics does closely follow his central spirit. That is, apart from being a genetic material for inheritance, DNA is also an ideal material for building molecular devices. -
Inverse Design for Silicon Photonics: from Iterative Optimization Algorithms to Deep Neural Networks
applied sciences Review Inverse Design for Silicon Photonics: From Iterative Optimization Algorithms to Deep Neural Networks Simei Mao 1,2, Lirong Cheng 1,2 , Caiyue Zhao 1,2, Faisal Nadeem Khan 2, Qian Li 3 and H. Y. Fu 1,2,* 1 Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, China; [email protected] (S.M.); [email protected] (L.C.); [email protected] (C.Z.) 2 Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China; [email protected] 3 School of Electronic and Computer Engineering, Peking University, Shenzhen 518055, China; [email protected] * Correspondence: [email protected]; Tel.: +86-755-3688-1498 Abstract: Silicon photonics is a low-cost and versatile platform for various applications. For design of silicon photonic devices, the light-material interaction within its complex subwavelength geometry is difficult to investigate analytically and therefore numerical simulations are majorly adopted. To make the design process more time-efficient and to improve the device performance to its physical limits, various methods have been proposed over the past few years to manipulate the geometries of silicon platform for specific applications. In this review paper, we summarize the design methodologies for silicon photonics including iterative optimization algorithms and deep neural networks. In case of iterative optimization methods, we discuss them in different scenarios in the sequence of increased degrees of freedom: empirical structure, QR-code like structure and irregular structure. We also review inverse design approaches assisted by deep neural networks, which generate multiple devices Citation: Mao, S.; Cheng, L.; Zhao, with similar structure much faster than iterative optimization methods and are thus suitable in C.; Khan, F.N.; Li, Q.; Fu, H.Y. -
Recent Advances in Silicon Photonic Integrated Circuits John E
Invited Paper Recent Advances in Silicon Photonic Integrated Circuits John E. Bowers*, Tin Komljenovic, Michael Davenport, Jared Hulme, Alan Y. Liu, Christos T. Santis, Alexander Spott, Sudharsanan Srinivasan, Eric J. Stanton, Chong Zhang Department of Electrical and Computer Engineering, University of California, Santa Barbara, CA 93106, USA *[email protected] ABSTRACT We review recent breakthroughs in silicon photonics technology and components and describe progress in silicon photonic integrated circuits. Heterogeneous silicon photonics has recently demonstrated performance that significantly outperforms native III-V components. The impact active silicon photonic integrated circuits could have on interconnects, telecommunications, sensors and silicon electronics is reviewed. Keywords: Heterogeneous silicon platform, integrated optoelectronics, optoelectronic devices, semiconductor lasers, silicon-on-insulator (SOI) technology, silicon photonics 1. INTRODUCTION Heterogeneous silicon photonics, due to its potential for medium- and large-scale integration, has been intensively researched. Recent developments have shown that heterogeneous integration not only allows for a reduced cost due to economy of scale, but also allows for same or even better performing devices than what has previously been demonstrated utilizing only III-V materials. Furthermore we believe that optical interconnects are the only way to solve the scaling limitation in modern processors, and that heterogeneous silicon photonics with on-chip sources is the best approach in the long term as it promises higher efficiency and lower cost. We address both beliefs in sections that follow. In this paper we plan to briefly address heterogeneous silicon approaches, and point-out that the heterogeneous silicon platform is more than just III-V on silicon but can have advantages for isolators, circulators and nonlinear devices (Section 2). -
Underwater Transformer
ALL ABOARD THE THE LAST A FORGOTTEN MICROGRIDS HYDROGEN TRAIN TRANSISTOR? REVOLUTION GO MOBILE Fuel cells go the Nanosheet devices and Why switching power A new and cleaner extra mile the end of Moore’s Law supplies triumphed way to power a ferry P. 06 P. 30 P. 36 P. 42 THIS UNTETHERED HALF HUMANOID WILL WORK ON OFFSHORE OIL RIGS AND GO DEEPER THAN FOR THE FOR THE TECHNOLOGY INSIDERTECHNOLOGY | 08.19 HUMAN DIVERS INSIDER P. 22 08.19 THE UNDERWATER TRANSFORMER Subscriber Address Box Zurich Instruments ∏ Arbitrary Waveform Generators ∏ Impedance Analyzers ∏ Lock-in Amplifiers ∏ Quantum Computing Control Systems experience LabOne LabOne® provides users with a platform independent instrument control including proven measurement methodo- logies. It's designed to offer a great amount of flexibility for instrument usage and assures quick and efficient ope- ration. The browser based user interface provides an outstanding toolset for time and frequency domain analysis as well as sophisticated support to set up control loops, making noise measure- ments or to interpret measurement data. Let's discuss your application Intl. +41 44 515 0410 USA 855-500-0056 (Toll Free) [email protected] www.zhinst.com CONTENTS_08.19 THE UNDER- WATER 30 THE LAST 36 THE QUIET 42 HAPPINESS IS 06 NEWS SILICON REMAKING OF A HYBRID-ELECTRIC 14 RESOURCES TRANSFORMER TRANSISTOR COMPUTER POWER FERRY 04 OPINION The next step in SUPPLIES The retrofitted 52 PAST FORWARD A startup founded by ex-NASA the evolution of the Here’s how the ship offers a clean, engineers wants to upend subsea transistor is the compact and efficient quiet ride for 4,500 nanosheet device. -
Wirelessly-Powered Cage Designs for Supporting Long-Term Experiments on Small Freely Behaving Animals in a Large Experimental Arena
electronics Review Wirelessly-Powered Cage Designs for Supporting Long-Term Experiments on Small Freely Behaving Animals in a Large Experimental Arena Byunghun Lee 1 and Yaoyao Jia 2,* 1 Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea; [email protected] 2 Department of Electrical and Computer Engineering, North Carolina State University, 890 Oval Dr, Raleigh, NC 27606, USA * Correspondence: [email protected]; Tel.: +1-919-515-7350 Received: 22 October 2020; Accepted: 18 November 2020; Published: 25 November 2020 Abstract: In modern implantable medical devices (IMDs), wireless power transmission (WPT) between inside and outside of the animal body is essential to power the IMD. Unlike conventional WPT, which transmits the wireless power only between fixed Tx and Rx coils, the wirelessly-powered cage system can wirelessly power the IMD implanted in a small animal subject while the animal freely moves inside the cage during the experiment. A few wirelessly-powered cage systems have been developed to either directly power the IMD or recharge batteries during the experiment. Since these systems adapted different power carrier frequencies, coil configurations, subject tracking techniques, and wireless powered area, it is important for designers to select suitable wirelessly-powered cage designs, considering the practical limitations in wirelessly powering the IMD, such as power transfer efficiency (PTE), power delivered to load (PDL), closed-loop power control (CLPC), scalability, spatial/angular misalignment, near-field data telemetry, and safety issues against various perturbations during the longitudinal animal experiment. In this article, we review the trend of state-of-the-art wirelessly-powered cage designs and practical considerations of relevant technologies for various IMD applications.