DOCSLIB.ORG

Growth of Graded Quantum Wells for Thz Polaritonics

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Growth of Graded Quantum Wells for Thz Polaritonics Growth of graded quantum wells for THz polaritonics by Chris Deimert A thesis presented to the University of Waterloo in fulllment of the thesis requirement for the degree of Doctor of Philosophy in Electrical and Computer Engineering Waterloo, Ontario, Canada, 2021 © Chris Deimert 2021 Examining Committee Membership The following served on the Examining Committee for this thesis. The decision of the Examining Commit- tee is by majority vote. External Examiner: Gottfried Strasser, Professor, Electrical Engineering and Information Technology, Vienna University of Technology (TU Wien) Supervisor: Zbigniew R. Wasilewski, Professor, Electrical and Computer Engineering, University of Waterloo Internal Member: Dayan Ban, Professor, Electrical and Computer Engineering, University of Waterloo Internal Member: Na Young Kim, Associate Professor, Electrical and Computer Engineering, University of Waterloo Internal-External Robert Hill, Associate Professor, Member: Dept. of Physics and Astronomy, University of Waterloo ii Author’s Declaration I hereby declare that I am the sole author of this thesis. This is a true copy of the thesis, including any required nal revisions, as accepted by my examiners. I understand that my thesis may be made electronically available to the public. iii Abstract Rectangular quantum wells have long dominated the landscape of layered nanostructures. They exhibit a rich variety of physics and can be reliably grown with techniques such as molecular beam epitaxy. Rectangular wells represent only a fraction of the possible design space, however: much less explored have been alternative structures with continuously varying potential proles. This is not for want of applications. Parabolic quantum wells (PQWs), wells with a quadratically varying prole, have been recently identied as a potential key ingredient for terahertz (THz) polaritonic devices. The development of THz devices remains an important challenge with myriad applications that are only just beginning to be unlocked. We aim toward this important challenge by developing THz polaritonics based on PQW active regions, bringing to bear the fascinating physics of polariton quasiparticles – part light, part matter – and one of the most ubiquitous elements in physics, the harmonic oscillator. Using non-square quantum wells comes with challenges, however. Growing these structures with molecular beam epitaxy requires time-varying ux from the eusion cells, which is dicult to produce reliably due to the slow thermal response of the cells. While this problem can sometimes be bypassed through the use of digital alloys, there are limits on the quality of material that can be produced in this way. We develop an approach for growing smoothly graded quantum wells with molecular beam epitaxy, compensating for the eusion cell’s thermal behaviour via a simple linear dynamical model. We further provide an iterative scheme to correct for any lingering errors. With this technique, we demonstrate the ability to grow smoothly graded Alx Ga1 – x As PQWs for THz polaritonics, with a root- mean-square Al composition (x) error of just 0.0018. This accuracy is achieved at the standard growth rates (0.15–0.25 nm=s) necessary for thick structures± of several micrometres or more. The approach is quite generally applicable beyond Alx Ga1 – x As PQWs, and could be used for other materials or composition proles, or for other situations where precise time-dependent ux control is required. We further study the properties of continuously graded Alx Ga1 – x As PQWs grown in this manner, both theoretically and experimentally. Theoretically, we pull together existing work in the literature to build a numerical semiclassical model of quantum well absorption, which includes the multi-subband plasmonic interactions that appear at the doping levels required for THz polaritonics. This, combined with electromagnetic modelling allows us to study the design aspects of THz quantum wells relevant to polaritonic devices. We explore the possibility of studies on polariton-polariton scattering, and examine the quality of quantum well active region necessary for such studies. We further explore the possibility of new active region designs incorporating half parabolic quantum wells. Experimentally, we probe PQWs grown with the continuous grading method, using reection mea- surements in a metal-insulator-metal cavity and absorption measurements in a multipass geometry. We demonstrate robust oscillation at 2.1 THz and 3 THz for structures containing 8, 18, and 54 PQWs. Ab- sorption at room temperature is achieved, which is as expected from a parabolic potential but would typically be impossible with square quantum wells in the THz. Linewidths below 12 % of the central frequency are obtained up to 150 K in two of the samples, with a very small 3.9 % linewidth obtained in one sample at 4 K. Furthermore, we show that the system correctly displays an absence of nonlinearity despite electron-electron interactions – analogous to the Kohn theorem. The high quality of these structures already opens up several new experimental vistas. iv Acknowledgements First and foremost, I would like to thank my supervisor, Prof. Zbig Wasilewski. Your support, guidance, and experience have been invaluable during my time in Waterloo. I am inspired by your curiosity and passion for science, and I have always been struck by your ability to remain calm in the face of challenges and setbacks. I truly hope that I can carry some piece of that forward. I would like to thank Profs. Gottfried Strasser, Rob Hill, Na Young Kim and Dayan Ban for the time they’ve dedicated to serving as my committee members. I would especially like to thank Prof. Kim and her post-doc Dr. Taehyun Yoon for their work on the photoluminescence excitation measurements in this thesis. Thanks to both Prof. Kim and Prof. Ban for many good discussions and collaborations over the years. I would like to thank Dr. Wojtek Pasek for his tireless eorts in plasmon modelling, and for his patience in guiding us experimentalists through the dark jungles of k p theory. I would like to thank the folks at the Centre for Nanoscience· and Nanotechnology in Paris – particularly Dr. Raaele Colombelli, Dr. Jean-Michel Manceau and soon-to-be-Dr. Paul Goulain – who were kind enough to host me there for several trips and who were heavily involved in the many of the designs and experiments presented throughout this thesis. I certainly could not have done this on my own, and it was a pleasure to work with all of you. I should also thank the folks at École normale supérieure, with particular thanks to Jacques Hawecker who not only helped us with time domain spectroscopy measurements, but who kindly lent me his guitar while I stayed in Paris. I feel I must give special thanks to my dog, Sterling, who has frequently encouraged me to take breaks from writing my thesis to play and go on walks. She is always selessly looking out for my mental well- being. More seriously though, I would like to thank my parents, who always encouraged my sense of curiosity. And I would like to thank all of my colleagues and friends and family who have supported me both in my work and in my life outside of research. I started listing your names, but there are just far too many of you. Believe me that each one of you has made a lasting impact. Doing a PhD is no easy task, and life has a way of surprising us with diculties and trials. Many of you have helped me through the dicult times: probably more than you realize. This – my whole life in the last ve and a half years in Waterloo – really wouldn’t have been possible without you. v Table of Contents List of Figures ix List of Abbreviations xvi 1 Overview 1 2 Background: a short survey of THz devices3 2.1 Applications of THz devices........................................3 2.1.1 THz communications.......................................3 2.1.2 Quantum information.......................................4 2.1.3 THz imaging and spectroscopy.................................4 2.2 Challenges in THz devices........................................5 2.3 Broadband THz sources..........................................6 2.3.1 Photoconductive antennas....................................6 2.3.2 Optical rectiers..........................................6 2.4 Continuous wave sources.........................................7 2.4.1 Photomixers............................................7 2.4.2 Dierence frequency generation................................7 2.4.3 Gas lasers..............................................7 2.4.4 P-type germanium lasers.....................................8 2.4.5 Microwave multiplication....................................8 2.4.6 Backwards wave oscillators...................................8 2.4.7 Free electron lasers........................................8 2.4.8 Quantum cascade lasers.....................................8 2.5 Final observations............................................. 10 3 Background: exciton polariton lasers 12 3.1 What are polaritons?............................................ 12 3.1.1 Quasiparticles........................................... 13 3.1.2 Exciton polaritons......................................... 14 3.2 Exciton polariton condensation..................................... 16 3.3 Exciton polariton lasers.......................................... 17 3.4 Exciton polaritons in the THz...................................... 18 vi 4 THz devices with intersubband polaritons 20 4.1 The active region.............................................
Load more

Recommended publications
  • Direct Experimental Visualization of Waves and Band Structure in 2D Photonic Crystal Slabs
    Home Search Collections Journals About Contact us My IOPscience Direct experimental visualization of waves and band structure in 2D photonic crystal slabs This content has been downloaded from IOPscience. Please scroll down to see the full text. 2014 New J. Phys. 16 053003 (http://iopscience.iop.org/1367-2630/16/5/053003) View the table of contents for this issue, or go to the journal homepage for more Download details: IP Address: 18.51.1.88 This content was downloaded on 16/06/2014 at 14:34 Please note that terms and conditions apply. Direct experimental visualization of waves and band structure in 2D photonic crystal slabs Benjamin K Ofori-Okai1, Prasahnt Sivarajah1, Christopher A Werley1,2, Stephanie M Teo1 and Keith A Nelson1 1 Department of Chemistry, MIT, 77 Massachusetts Avenue, Cambridge, MA 02139, USA 2 Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA E-mail: [email protected] Received 15 October 2013, revised 8 March 2014 Accepted for publication 21 March 2014 Published 1 May 2014 New Journal of Physics 16 (2014) 053003 doi:10.1088/1367-2630/16/5/053003 Abstract We demonstrate for the first time the ability to perform time resolved imaging of terahertz (THz) waves propagating within a photonic crystal (PhC) slab. For photonic lattices with different orientations and symmetries, we used the electro- optic effect to record the full spatiotemporal evolution of THz fields across a broad spectral range spanning the photonic band gap. In addition to revealing real-space behavior, the data let us directly map the band diagrams of the PhCs.
    [Show full text]
  • Quantum Floquet Engineering with an Exactly Solvable Tight-Binding Chain in a Cavity
    Quantum Floquet engineering with an exactly solvable tight-binding chain in a cavity Christian J. Eckhardt,1, 2, ∗ Giacomo Passetti,1, ∗ Moustafa Othman,3 Christoph Karrasch,3 Fabio Cavaliere,4, 5 Michael A. Sentef,2 and Dante M. Kennes1, 2, y 1Institut f¨urTheorie der Statistischen Physik, RWTH Aachen University and JARA-Fundamentals of Future Information Technology, 52056 Aachen, Germany 2Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany 3Technische Universit¨atBraunschweig, Institut f¨urMathematische Physik, Mendelssohnstraße 3, 38106 Braunschweig, Germany 4Dipartimento di Fisica, Universit`adi Genova, 16146, Genova, Italy 5SPIN-CNR, 16146, Genova, Italy (Dated: July 27, 2021) arXiv:2107.12236v1 [cond-mat.str-el] 26 Jul 2021 1 Abstract Recent experimental advances enable the manipulation of quantum matter by exploiting the quantum nature of light. However, paradigmatic exactly solvable models, such as the Dicke, Rabi or Jaynes-Cummings models for quantum-optical systems, are scarce in the corresponding solid-state, quantum materials context. Focusing on the long-wavelength limit for the light, here, we provide such an exactly solvable model given by a tight-binding chain coupled to a single cavity mode via a quantized version of the Peierls substitution. We show that perturbative expansions in the light-matter coupling have to be taken with care and can easily lead to a false superradiant phase. Furthermore, we provide an analytical expression for the groundstate in the thermodynamic limit, in which the cavity photons are squeezed by the light-matter coupling. In addition, we derive analytical expressions for the electronic single-particle spectral function and optical conductivity.
    [Show full text]
  • Infrared Polaritonic Biosensors Based on Two-Dimensional Materials
    molecules Review Infrared Polaritonic Biosensors Based on Two-Dimensional Materials Guangyu Du 1,2, Xiaozhi Bao 3, Shenghuang Lin 2 , Huan Pang 1, Shivananju Bannur Nanjunda 4,* and Qiaoliang Bao 5,* 1 School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou 225009, China; [email protected] (G.D.); [email protected] (H.P.) 2 Songshan Lake Materials Laboratory, Dongguan 523808, China; [email protected] 3 Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Macau, China; [email protected] 4 Department of Electrical Engineering, Centre of Excellence in Biochemical Sensing and Imaging Technologies (Cen-Bio-SIM), Indian Institute of Technology Madras, Chennai 600036, India 5 Shenzhen Exciton Science and Technology Ltd., Shenzhen 518052, China * Correspondence: [email protected] (S.B.N.); [email protected] (Q.B.) Abstract: In recent years, polaritons in two-dimensional (2D) materials have gained intensive research interests and significant progress due to their extraordinary properties of light-confinement, tunable carrier concentrations by gating and low loss absorption that leads to long polariton lifetimes. With additional advantages of biocompatibility, label-free, chemical identification of biomolecules through their vibrational fingerprints, graphene and related 2D materials can be adapted as excellent platforms for future polaritonic biosensor applications. Extreme spatial light confinement in 2D materials based polaritons supports atto-molar concentration or single molecule detection. In this article, we will review the state-of-the-art infrared polaritonic-based biosensors. We first discuss the concept of Citation: Du, G.; Bao, X.; Lin, S.; polaritons, then the biosensing properties of polaritons on various 2D materials, then lastly the Pang, H.; Bannur Nanjunda, S.; Bao, impending applications and future opportunities of infrared polaritonic biosensors for medical and Q.
    [Show full text]
  • Arxiv:1810.06761V1 [Physics.Optics] 16 Oct 2018
    Extreme enhancement of spin relaxation mediated by surface magnon polaritons Jamison Sloan1∗†, Nicholas Rivera1∗, John D. Joannopoulos1, Ido Kaminer2, and Marin Soljaciˇ c´1 1 Department of Physics, MIT, Cambridge, MA 02139, USA 2 Department of Electrical Engineering, Technion − Israel Institute of Technology, Haifa 32000, Israel. y Corresponding author e-mail: [email protected] * These authors contributed equally to this work Polaritons in metals, semimetals, semiconductors, and polar insulators, with their extreme confinement of electromagnetic energy, provide many promising opportunities for enhancing typically weak light-matter inter- actions such as multipolar radiation, multiphoton spontaneous emission, Raman scattering, and material non- linearities. These highly confined polaritons are quasi-electrostatic in nature, with most of their energy residing in the electric field. As a result, these “electric” polaritons are far from optimized for enhancing emission of a magnetic nature, such as spin relaxation, which is typically many orders of magnitude slower than corre- sponding electric decays. Here, we propose using surface magnon polaritons in negative magnetic permeability materials such as MnF2 and FeF2 to strongly enhance spin-relaxation in nearby emitters in the THz spectral range. We find that these magnetic polaritons in 100 nm thin-films can be confined to lengths over 10,000 times smaller than the wavelength of a photon at the same frequency, allowing for a surprising twelve orders of magnitude enhancement in magnetic dipole transitions. This takes THz spin-flip transitions, which normally occur at timescales on the order of a year, and forces them to occur at sub-ms timescales. Our results suggest an interesting platform for polaritonics at THz frequencies, and more broadly, a new way to use polaritons to control light-matter interactions.
    [Show full text]
  • Strong Coupling of Exciton-Polaritons in a Bulk Gan Planar Waveguide: Quantifying the Coupling Strength Christelle Brimont, Laetitia Doyennette, G
    Strong Coupling of Exciton-Polaritons in a Bulk GaN Planar Waveguide: Quantifying the Coupling Strength Christelle Brimont, Laetitia Doyennette, G. Kreyder, F. Reveret, P. Disseix, F. Medard, J. Leymarie, E. Cambril, S. Bouchoule, M. Gromovyi, et al. To cite this version: Christelle Brimont, Laetitia Doyennette, G. Kreyder, F. Reveret, P. Disseix, et al.. Strong Cou- pling of Exciton-Polaritons in a Bulk GaN Planar Waveguide: Quantifying the Coupling Strength. Physical Review Applied, American Physical Society, 2020, 14 (5), pp.4060. 10.1103/physrevap- plied.14.054060. hal-03034132 HAL Id: hal-03034132 https://hal.archives-ouvertes.fr/hal-03034132 Submitted on 1 Dec 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. PHYSICAL REVIEW APPLIED 14, 054060 (2020) Strong Coupling of Exciton-Polaritons in a Bulk GaN Planar Waveguide: Quantifying the Coupling Strength C. Brimont,1 L. Doyennette,1 G. Kreyder,2 F. Réveret,2 P. Disseix,2 F. Médard ,2 J. Leymarie,2 E. Cambril,3 S. Bouchoule,3 M. Gromovyi,3,4 B. Alloing,4 S. Rennesson,4 F. Semond,4 J. Zúñiga-Pérez,4
    [Show full text]
  • Nonlinear Polaritonics
    Polariton potential DR ELENA OSTROVSKAYA Dr Elena Ostrovskaya discusses her role in establishing Australia’s first research programme in theoretical and experimental polaritonics and the exciting new developments currently underway in the field Can you discuss some of the most significant local support for both theory and important technological benefits to have experiment. The ANU also hosts a node of resulted from the field’s development, the Australian National Fabrication Facility, elaborating on the key objectives of your which enables customised post-processing of current project? experimental samples. The development of polaritonics has so far How does your collaboration with Dr focused on proof-of-principle demonstrations Robert Dall help lead this work? of devices that explore the unique properties of polaritonics that stem from their hybrid Dr Robert Dall is a highly skilled and very light-matter nature. These devices explore experienced experimentalist in the field of ultrafast polariton velocities that are close ultracold atomic physics and a driving force to those of photons, high nonlinearities behind the experimental development of inherited from excitons, and spin degrees the project. We work as a team, with Dall of freedom. running the experiments, me providing theory support and guidance, and both of us equally My project focuses on both fundamental contributing to the strategic planning of the and applied aspects of the exciton-polariton research programme. What initially drew you to the field BEC inside semiconductor microcavities. of polaritonics? The theoretical and experimental goals Robert Dall’s previous experience is in are twofold: first and foremost, we plan building the most sophisticated apparatus My PhD research was in the field of theoretical to create tailored polariton BEC systems for Bose condensing metastable Helium and nonlinear optics and photonics, and I that will enable us to probe into several experiments on Helium BECs.
    [Show full text]
  • Controlling Spins with Surface Magnon Polaritons Jamison Sloan
    Controlling spins with surface magnon polaritons by Jamison Sloan B.S. Physics Massachussetts Institute of Technology (2017) Submitted to the Department of Electrical Engineering and Computer Science in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering and Computer Science at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY June 2020 ○c Massachusetts Institute of Technology 2020. All rights reserved. Author............................................................. Department of Electrical Engineering and Computer Science May 13, 2020 Certified by . Marin Soljaciˇ c´ Professor of Physics Thesis Supervisor Accepted by. Leslie A. Kolodziejski Professor of Electrical Engineering and Computer Science Chair, Department Committee on Graduate Students 2 Controlling spins with surface magnon polaritons by Jamison Sloan Submitted to the Department of Electrical Engineering and Computer Science on May 13, 2020, in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering and Computer Science Abstract Polaritons in metals, semimetals, semiconductors, and polar insulators can allow for ex- treme confinement of electromagnetic energy, providing many promising opportunities for enhancing typically weak light-matter interactions such as multipolar radiation, multipho- ton spontaneous emission, Raman scattering, and material nonlinearities. These extremely confined polaritons are quasi-electrostatic in nature, with most of their energy residing in the electric field. As a result, these "electric" polaritons are far from optimized for en- hancing emission of a magnetic nature, such as spin relaxation, which is typically many orders of magnitude slower than corresponding electric decays. Here, we take concepts of “electric” polaritons into magnetic materials, and propose using surface magnon polaritons in negative magnetic permeability materials to strongly enhance spin-relaxation in nearby emitters.
    [Show full text]
  • Scitech News- 68(3)-2014
    Sci-Tech News Volume 68 Issue 3 Article 1 8-21-2014 SciTech News- 68(3)-2014 Follow this and additional works at: https://jdc.jefferson.edu/scitechnews Part of the Medicine and Health Sciences Commons Let us know how access to this document benefits ouy Recommended Citation (2014) "SciTech News- 68(3)-2014," Sci-Tech News: Vol. 68 : Iss. 3 , Article 1. Available at: https://jdc.jefferson.edu/scitechnews/vol68/iss3/1 This Article is brought to you for free and open access by the Jefferson Digital Commons. The Jefferson Digital Commons is a service of Thomas Jefferson University's Center for Teaching and Learning (CTL). The Commons is a showcase for Jefferson books and journals, peer-reviewed scholarly publications, unique historical collections from the University archives, and teaching tools. The Jefferson Digital Commons allows researchers and interested readers anywhere in the world to learn about and keep up to date with Jefferson scholarship. This article has been accepted for inclusion in Sci-Tech News by an authorized administrator of the Jefferson Digital Commons. For more information, please contact: [email protected]. et al.: SciTech News- 68(3)-2014 The Official Bulletin for the Chemistry, Engineering, and Science-Technology Divisions and the Aerospace Section of the Engineering Division and the Materials Research and Manufacturing Section of the Chemistry Division of the Special Libraries Association ISSNPublished 0036-8059 by Jefferson Digital Commons, 2014 Volume 68, No 3 (2014)1 Sci-Tech News, Vol. 68 [2014], Iss. 3, Art. 1 Volume 68, Number 3 (2014) ISSN 0036-8059 Columns and Reports From the Editor ........................................
    [Show full text]
  • Cavity Quantum Electrodynamics and Intersubband Polaritonics of a Two Dimensional Electron Gas Simone De Liberato
    Cavity quantum electrodynamics and intersubband polaritonics of a two dimensional electron gas Simone de Liberato To cite this version: Simone de Liberato. Cavity quantum electrodynamics and intersubband polaritonics of a two di- mensional electron gas. Condensed Matter [cond-mat]. Université Paris-Diderot - Paris VII, 2009. English. tel-00421386 HAL Id: tel-00421386 https://tel.archives-ouvertes.fr/tel-00421386 Submitted on 1 Oct 2009 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. UNIVERSITE´ PARIS DIDEROT (Paris 7) ECOLE DOCTORALE: ED107 DOCTORAT Physique SIMONE DE LIBERATO CAVITY QUANTUM ELECTRODYNAMICS AND INTERSUBBAND POLARITONICS OF A TWO DIMENSIONAL ELECTRON GAS Th`ese dirig´ee par Cristiano Ciuti Soutenue le 24 juin 2009 JURY M. David S. CITRIN Rapporteur M. Michel DEVORET Rapporteur M. Cristiano CIUTI Directeur M. Carlo SIRTORI Pr´esident M. Iacopo CARUSOTTO Membre M. Benoˆıt DOUC¸OT Membre Contents Acknowledgments 3 Curriculum vitae 5 Publication list 9 Introduction 13 1 Introduction intersubband polaritons physics 19 1.1 Introduction............................. 19 1.2 Useful quantum mechanics concepts . 20 1.2.1 Weakandstrongcoupling . 20 1.2.2 Collectivecoupling . 20 1.2.3 BosonicApproximation. 21 1.2.4 The rotating wave approximation .
    [Show full text]
  • Research Development & Grant Writing News
    Research Development & Grant Writing News Volume 6, Issue 9: May 15, 2016 Research Development & !!Check out our New Website HERE!! Grant Writing News © Table of Contents Published monthly since 2010 for faculty Topics of Interest URLs and research professionals by Positioning for Smaller Team Grants Academic Research Funding Strategies, LLC Where Proposals Run Off the Road Mike Cronan & Lucy Deckard, co-Publishers Copyright 2016. All rights reserved. Human Health-Related Funding at NSF: Dos Subscribe Online (Hotlink) and Don’ts Queries: [email protected] Benefits of Packing Your Own Funding Chute ©Please do not post to open websites© Tracking the 2017 Federal Research Budgets About the co-publishers Research Grant Writing Web Resources Mike Cronan, PE (Texas 063512, inactive) Educational Grant Writing Web Resources has 23 years of experience developing and Agency Research News writing successful team proposals at Texas Agency Reports, Workshops & Roadmaps A&M University. He was named a Texas A&M New Funding Opportunities University System Regents Fellow (2001- About Academic Research Funding Strategies 2010) for developing and writing A&M System-wide grants funded at over $100 million by NSF and other funding agencies. Contact Us For: He developed and directed two research Editing and proof reading of journal development and grant writing offices, one articles, book manuscripts, proposals, etc. for Texas A&M’s VPR and the other for the Texas Engineering Experiment Station (15 By Katherine E. Kelly, PhD research divisions state-wide). Lucy Deckard (BS/MS Materials) worked in NSF CAREER Webinar research development and grant writing at Access to a recording of our recent NSF Texas A&M University and across the A&M System for nine years.
    [Show full text]
  • Annual Report 2020 of the Department of Physics
    ANNUAL REPORT 2020 DEPARTMENT OF PHYSICS 1 For JYU. Since 1863. DEPARTMENT OF PHYSICS At the Department of Physics in the University of Jyväskylä, we investigate the basic phenomena of nature and educate future physicists and physics teachers. Our Department is the most eminent research unit in Finland in the field of subatomic physics, i.e. particle and nuclear physics. Our Accelerator Laboratory is one of the largest and most international research infrastructures in Finland. The four accelerators housed by the laboratory are used to study nuclei and the structure of matter. Our Department also specializes in studying matter on the scale of a nanometre. The modern instruments for this research can be found from the Nanoscience Center, located next to the Department and housing part of our personnel. Our Department is highly international and we collaborate with numerous universities and research institutes abroad, such as CERN. PREFACE HEAD OF DEPARTMENT FOREWORD 20 This Annual Report provides a summary of the activities at the Department of Physics during the year 20201). The research at Department of Physics at University detriments, as is already now evident. The scientific of Jyväskylä is carried out in two main areas, activity and productivity of the Department also 20 subatomic physics and materials physics. These remained at high level. As an indication of that, the ANNUAL REPORT generic research entities both include a variety total amount of publications produced was about Department of Physics of topics that utilize methods of theoretical, 300. As a single example of the impact of publication computational and experimental physics.
    [Show full text]
  • Photonic-Crystal Exciton-Polaritons in Monolayer Semiconductors
    ARTICLE DOI: 10.1038/s41467-018-03188-x OPEN Photonic-crystal exciton-polaritons in monolayer semiconductors Long Zhang 1, Rahul Gogna2, Will Burg3, Emanuel Tutuc3 & Hui Deng 1,2 Semiconductor microcavity polaritons, formed via strong exciton-photon coupling, provide a quantum many-body system on a chip, featuring rich physics phenomena for better photonic technology. However, conventional polariton cavities are bulky, difficult to integrate, and fl 1234567890():,; in exible for mode control, especially for room-temperature materials. Here we demonstrate sub-wavelength-thick, one-dimensional photonic crystals as a designable, compact, and practical platform for strong coupling with atomically thin van der Waals crystals. Polariton dispersions and mode anti-crossings are measured up to room temperature. Non-radiative decay to dark excitons is suppressed due to polariton enhancement of the radiative decay. Unusual features, including highly anisotropic dispersions and adjustable Fano resonances in reflectance, may facilitate high temperature polariton condensation in variable dimensions. Combining slab photonic crystals and van der Waals crystals in the strong coupling regime allows unprecedented engineering flexibility for exploring novel polariton phenomena and device concepts. 1 Physics Department, University of Michigan, 450 Church Street, Ann Arbor, MI 48109-2122, USA. 2 Applied Physics Program, University of Michigan, 450 Church Street, Ann Arbor, MI 48109-1040, USA. 3 Microelectronics Research Center, Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78758, USA. Correspondence and requests for materials should be addressed to H.D. (email: [email protected]) NATURE COMMUNICATIONS | (2018) 9:713 | DOI: 10.1038/s41467-018-03188-x | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | DOI: 10.1038/s41467-018-03188-x – ontrol of light-matter interactions is elementary to the implemented25 28.
    [Show full text]