Publications de Duncan Thomas Lindsay Alexander

Publications associées (73)

Waveguide modes spatially resolved by low-loss STEM-EELS

In an era of new developments in nanomaterials analysis enabled by the unprecedented spatial and energy resolutions of electron energy-loss spectroscopy in the scanning transmission electron microscope (STEM-EELS), it remains that the vast majority of work ...

2021

Mode Evolution in Strongly Coupled Plasmonic Dolmens Fabricated by Templated Assembly

Jürgen Brugger, Olivier Martin, Jérémy Butet, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Valentin Flauraud, Massimo Mastrangeli

Plasmonic antennas have enabled a wealth of applications that exploit tailored near-fields and radiative properties, further endowed by the bespoke interactions of multiple resonant building blocks. Specifically, when the interparticle distances are reduce ...

2017

Fabrication and Characteristics of Yb-Doped Silica Fibers Produced by the Sol-Gel Based Granulated Silica Method

Duncan Thomas Lindsay Alexander, Hossein Najafi

Combining the sol-gel method for fiber material production with the granulated silica method for preform assembly results in a robust method that offers a high degree of freedom regarding both the composition and the geometry of the produced fiber. Using t ...

2018

Effects of Si and Y in structural development of (Al,Cr,Si/Y)OxN1 (-) (x) thin films deposited by magnetron sputtering

Alireza Karimi, Duncan Thomas Lindsay Alexander, Hossein Najafi

Silicon (Si) and yttrium (Y) are believed to have a strong influence on functional properties of oxynitrides due to their effects in the growth process and incorporation in solid solution phases. It is worthwhile noting that the presence of these elements ...

Elsevier Science Sa2013

Electronic Structure-Dependent Surface Plasmon Resonance in Single Au-Fe Nanoalloys

Olivier Martin, Duncan Thomas Lindsay Alexander, Jérémy Butet, Gabriel David Bernasconi

The relationship between composition and plasmonic properties in noble metal nanoalloys is still largely unexplored. Yet, nanoalloys of noble metals, such as gold, with transition elements, such as iron, have unique properties and a number of potential app ...

2019

From STEM-EDXS data to phase separation and quantification using physics-guided NMF

Thomas Tim Holvoet, Cécile Hébert, Duncan Thomas Lindsay Alexander, Nathanaël Perraudin, Guillaume Romain Obozinski

We present the development of a new algorithm which combines state-of-the-art energy-dispersive x-ray (EDX) spectroscopy theory and a suitable machine learning formulation for the hyperspectral unmixing of scanning transmission electron microscope EDX spec ...

2024

Mode Coupling in Plasmonic Heterodimers Probed with Electron Energy Loss Spectroscopy

Jürgen Brugger, Olivier Martin, Jérémy Butet, Duncan Thomas Lindsay Alexander, Gabriel David Bernasconi, Valentin Flauraud

While plasmonic antennas composed of building blocks made of the same material have been thoroughly studied, recent investigations have highlighted the unique opportunities enabled by making compositionally asymmetric plasmonic systems. So far, mainly hete ...

American Chemical Society2017

Where Does Energy Go in Electron Energy Loss Spectroscopy of Nanostructures?

Jürgen Brugger, Olivier Martin, Duncan Thomas Lindsay Alexander, Jérémy Butet, Valentin Flauraud, Gabriel David Bernasconi

Electron energy loss spectroscopy is a method of choice for the characterization of both the spatial and spectral properties of localized surface plasmon resonances. The energy lost by the impinging electrons is commonly explained by the Lorentz force acti ...

2017

Competition between Carrier Injection and Structural Distortions in Electron-Doped Perovskite Nickelate Thin Films

Duncan Thomas Lindsay Alexander, Bernat Mundet

The discovery of superconductivity in doped infinite-layer nickelate thin films has brought increased attention to the behavior of the doped perovskite phase. Despite this interest, the majority of existing studies pertain to hole-doped perovskite rare-ear ...

WILEY2023

Operando insights into correlating CO coverage and Cu-Au alloying with the selectivity of Au NP-decorated Cu2O nanocubes during the electrocatalytic CO2 reduction

Duncan Thomas Lindsay Alexander, Daniele Casari

Electrochemical reduction of CO2 (CO2RR) is an attractive technology to reintegrate the anthropogenic CO2 back into the carbon cycle driven by a suitable catalyst. This study employs highly efficient multi-carbon (C2+) producing Cu2O nanocubes (NCs) decora ...

ROYAL SOC CHEMISTRY2024

c-texture versus a-texture low pressure metalorganic chemical vapor deposition ZnO films: Lower resistivity despite smaller grain size

Christophe Ballif, Duncan Thomas Lindsay Alexander, Sylvain Nicolay, Monica Morales Masis, Laura Ding, Lorenzo Fanni, Arthur Brian Aebersold

Recently, it has been shown that it is possible to tune the morphology of zinc oxide films deposited by low-pressure metalorganic chemical vapor deposition (LP-MOCVD) while preserving good electrical conductivity. Here a closer look is taken at films depos ...

Elsevier2014

Towards an improved understanding of the β-TCP crystal structure by means of “checkerboard” atomistic simulations

Paul Bowen, Duncan Thomas Lindsay Alexander, Gabrielle Anne Laguisma Sblendorio

The large variability of biological responses to beta-TCP implants reported in the literature could possibly be related to subtle differences in the beta-TCP crystal structure. The structure contains one partially occupied site Ca(4). In order to better un ...

2023

Imaging of high-Q cavity optical modes by electron energy-loss microscopy

Romuald Houdré, Cécile Hébert, Marco Cantoni, Duncan Thomas Lindsay Alexander, Nicolas Le Thomas

We show a technique that images the intensity distribution and local state of polarization of the optical field of high-quality factor optical modes confined in dielectric planar photonic crystal nanocavities. Based on energy-loss spectroscopy of swift ele ...

Amer Physical Soc2013

espm: A Python library for the simulation of STEM-EDXS datasets

Adrien Maxime Louis Teurtrie, Cécile Hébert, Duncan Thomas Lindsay Alexander, Nathanaël Perraudin, Hui Chen, Guillaume Romain Obozinski, Hui Chen

We present two open-source Python packages: "electron spectro-microscopy"(espm) and "electron microscopy tables"(emtables). The espm software enables the simulation of scanning transmission electron microscopy energy-dispersive X-ray spectroscopy datacubes ...

ELSEVIER2023

3D Ordering at the Liquid-Solid Polar Interface of Nanowires

Anna Fontcuberta i Morral, Cécile Hébert, Michele Ceriotti, Duncan Thomas Lindsay Alexander, Gözde Tütüncüoglu, Nicolas Tappy, Mahdi Zamani, Martin George Friedl, Luca Francaviglia, Giulio Imbalzano, Lea Ghisalberti

The nature of the liquid-solid interface determines the characteristics of a variety of physical phenomena, including catalysis, electrochemistry, lubrication, and crystal growth. Most of the established models for crystal growth are based on macroscopic t ...

Wiley2020

Synthesis of Nanosized Mn-Doped ZnO by Low Temperature Decomposition of Hydrozincite Precursors

László Forró, Arnaud Magrez, Andrzej Sienkiewicz, Duncan Thomas Lindsay Alexander, Marijana Mionic Ebersold, Zlatko Mickovic

Transition-metal-doped ZnO is considered a promising candidate for applications in spintronics. Here, we developed it novel and versatile synthetic route for obtaining impurity-free Mn-doped zinc oxide (Zn1-xMnxO) materials witha well-controlled content of ...

2010

Direct Imaging of Dopant Distribution in Polycrystalline ZnO Films

Christophe Ballif, Cécile Hébert, Aïcha Hessler-Wyser, Duncan Thomas Lindsay Alexander, Stéphane Laurent Escrig, Monica Morales Masis, Sylvain Nicolay, Martin Ledinsky, Arthur Brian Aebersold

Two fundamental requirements of transparent conductive oxides are high conductivity and low optical absorptance, properties strongly dependent on the free-carrier concentration of the film. The free carrier concentration is usually-tuned by the addition of ...

Amer Chemical Soc2017

Electrochemical Reaction in Single Layer MoS2: nanopores opened atom by atom

Aleksandra Radenovic, Andras Kis, Duncan Thomas Lindsay Alexander, Dumitru Dumcenco, Martina Lihter, Ke Liu, Michael Graf, Roman Bulushev, Jiandong Feng, Daria Krasnozhon

Ultrathin nanopore membranes based on 2D materials have demonstrated ultimate resolution toward DNA sequencing. Among them, molybdenum disulfide (MoS2) shows long-term stability as well as superior sensitivity enabling high throughput performance. The trad ...

American Chemical Society (ACS)2015

Influence of the sintering atmosphere on the physico-chemical properties and the osteoclastic resorption of β-tricalcium phosphate cylinders

Paul Bowen, Duncan Thomas Lindsay Alexander, Gabrielle Anne Laguisma Sblendorio

One of the most widely used materials for bone graft substitution is β-Tricalcium phosphate (β-TCP;β- Ca3(PO4)2). beta-TCP is typically produced by sintering in air or vacuum. During this process, evaporation of phosphorus ...

Elsevier Sci Ltd2023

Engineering Symmetry Breaking Interfaces by Nanoscale Structural-Energetics in Orthorhombic Perovskite Thin Films

Duncan Thomas Lindsay Alexander, Bernat Mundet

The atomic configuration of phases and their interfaces is fundamental to materials design and engineering. Here, we unveil a transition metal oxide interface, whose formation is driven by energetic influences─epitaxial tensile strain versus oxygen octahed ...

2025