J
Jonathan S. Barnard
Researcher at University of Cambridge
Publications - 75
Citations - 2901
Jonathan S. Barnard is an academic researcher from University of Cambridge. The author has contributed to research in topics: Quantum well & Dislocation. The author has an hindex of 28, co-authored 75 publications receiving 2573 citations. Previous affiliations of Jonathan S. Barnard include University of Bristol & Uppsala University.
Papers
More filters
Journal ArticleDOI
Electron-beam-induced strain within InGaN quantum wells: False indium “cluster” detection in the transmission electron microscope
TL;DR: In this paper, high-resolution TEM images acquired immediately after first irradiating a region of quantum well indicates no gross fluctuations of indium content in the InGaN alloy, during only a brief period of irradiation, inhomogeneous strain is introduced in the material due to electron beam damage.
Journal ArticleDOI
Optical and microstructural studies of InGaN∕GaN single-quantum-well structures
Darren M. Graham,A. Soltani-Vala,Phil Dawson,M. J. Godfrey,Tim Michael Smeeton,Jonathan S. Barnard,Menno J. Kappers,Colin J. Humphreys,Ej Thrush +8 more
TL;DR: In this paper, the Huang-Rhys factor extracted from the Fabry-Perot interference-free photoluminescence spectra has been compared with the results of a model calculation, yielding a value of approximately 2nm for the in-plane localization length scale of carriers.
Journal ArticleDOI
Microstructure of selective laser melted CM247LC nickel-based superalloy and its evolution through heat treatment
V.D. Divya,R. Muñoz-Moreno,Omdm Messé,Jonathan S. Barnard,S. Baker,T. Illston,Howard J. Stone +6 more
TL;DR: In this paper, the microstructure of the nickel-based superalloy, CM247LC, has been characterised following selective laser melting and after a post deposition heat treatment below the γʹ solvus temperature.
Journal ArticleDOI
Grain-boundary precipitation in Allvac 718Plus
Ed Pickering,Harshal N. Mathur,Ayan Bhowmik,O.M.D.M. Messé,Jonathan S. Barnard,Mark Hardy,Robert Krakow,K. Loehnert,Howard J. Stone,Catherine M.F. Rae +9 more
TL;DR: In this article, the crystal structure and chemistry of this phase was found to be different from the orthorhombic Ni 3 Nb δ phase reported previously in Inconel 718 and Allvac 718Plus.
Journal ArticleDOI
Threading plasmonic nanoparticle strings with light
Lars O. Herrmann,Ventsislav K. Valev,Christos Tserkezis,Jonathan S. Barnard,Setu Kasera,Oren A. Scherman,Javier Aizpurua,Jeremy J. Baumberg +7 more
TL;DR: An efficient route to nano-assembly through plasmon-induced laser threading of gold nanoparticle strings is demonstrated, producing conducting threads 12±2 nm wide, enabling nanometre-scale tuning of the optical and conducting properties of such nanomaterials.