Publications related to Bell Labs

Off-axis electron holography for the direct visualization of perpendicular shape anisotropy in nanoscale 3D magnetic random-access-memory devices

Perpendicular shape anisotropy (PSA) and double magnetic tunnel junctions (DMTJs) offer practical solutions to downscale spin-transfer-torque Magnetic Random-Access Memory (STT-MRAM) beyond 20 nm technology nodes, while retaining their thermal stability an ...

AIP Publishing2022

The 3D Smith Chart: From Theory to Experimental Reality

Mihai Adrian Ionescu, Andrei Müller

The Smith chart was primarily developed, extended, and refined by Phillip Hagar Smith [1] in a series of works published [2]-[4] between 1939 and 1969. Smith was born in Lexington, Massachusetts, in 1905. He majored in electrical communications at Tufts Un ...

2020

Scalable Nanowire Networks: Growth and Functionality

Martin George Friedl

With the rise of quantum computing and recent experiments into topological quantum computers come exciting new opportunities for III-V semiconductor quantum nanostructures. In this thesis, we explore the scalable fabrication of patterned arrays and branche ...

EPFL2020

Crystal Phase Engineering in III-V Semiconductor Films: from Epitaxy to Devices

Philipp Staudinger

Crystal phase engineering is an exciting pathway to enhance the properties of conventional semiconductors. Metastable SiGe presents a direct band gap well suited for optical devices whereas wurtzite (WZ) phosphide alloys enable efficient light emission in ...

EPFL2020

Silicon Photonic Broadband Suspended Directional Coupler

Niels Quack, Hamed Sattari, Alain Yuji Takabayashi, Yu Zhang

We demonstrate a broadband Silicon Photonic directional coupler that is entirely suspended in air. The device has been fabricated in a simplified Silicon Photonics process based on the standard IMEC ISIPP5OG platform, combined with custom post-processing i ...

IEEE2019

Promoting and Implementing Digital STEM Education at Secondary Schools in Africa

Denis Gillet, Juan Carlos Farah

This paper discusses an ongoing initiative aimed at promoting and implementing digital STEM education at secondary schools in Africa. This initiative, coined Go-Lab Goes Africa (GO-GA), is an innovation action supported by the European Commission through i ...

IEEE2019

Spin-valley optoelectronics based on two-dimensional materials

Dmitrii Unuchek

Two-dimensional (2D) materials, in particular graphene and transition metal dichalcogenides (TMDC), have attracted great scientific interest over the last decade, revealing exceptional mechanical, electrical and optical properties. Owing to their layered n ...

EPFL2019

Characterization and Modelling of the Emission Zone and Exciton Dynamics in Doped Organic Light-Emitting Diodes

Markus Regnat

Only recently organic light-emitting diode (OLED) technology has successfully managed the transition from research labs into the consumer market, taking a 60% share of the global mobile display market in 2018. The latest discovery of thermally activated de ...

EPFL2019

Towards an Integrated-Photonics Optical-Frequency Synthesizer With < 1 Hz Residual Frequency Noise

Tobias Kippenberg, Nicolas Volet, Martin Hubert Peter Pfeiffer

We introduce an architecture for optical-frequency synthesis using photonic-chip frequency combs and a heterogeneously integrated CW laser. The Kerr dual-comb that we describe offers a microwave-optical link to discipline the laser to an RF clock. ...

Ieee2017

Manufacturing with light - micro-assembly of opto-electronic microstructures

Yongpeng Liu

Optical micromanipulation allows the movement and patterning of discrete micro-particles within a liquid environment. However, for manufacturing applications it is desirable to remove the liquid, leaving the patterned particles in place. In this work, we h ...

Optical Soc Amer2017

Performance of ITER Correction Busbar Conductor Samples CBCN2 and CBCN3

Pierluigi Bruzzone, Kamil Sedlák, Boris Stepanov, Fang Liu, Bo Liu

The correction busbar (CB) conductors for the ITER project are being produced in China. The second China CB conductor sample (CBCN2, Phase II of conductor testing) and the third CB conductor sample (CBCN3, Phase III testing) were made of the WST NbTi stran ...

IEEE Institute of Electrical and Electronics Engineers2016

A Novel Compressive Sensing Architecture for High-Density Biological Signal Recording

Alexandre Schmid, Mahsa Shoaran, Hossein Afshari

The massive amount of data recorded by dense electrode arrays which are routinely connected to Nyquist-sampling signal conditioning blocks introduces new design challenges for implantable and wireless biological signal acquisition. Five different architect ...

2014

Ultrafast tristable spin memory of a coherent polariton gas

Benoît Marie Joseph Deveaud, François Morier-Genoud, Marcia Portella Oberli, Taofiq Paraïso, Roland Cerna

Non-linear interactions in coherent gases are not only at the origin of bright and dark solitons and superfluids; they also give rise to phenomena such as multistability, which hold great promise for the development of advanced photonic and spintronic devi ...

Nature Publishing Group2013

Witnessing the early semiconductor laser development at Bell Telephone Laboratories, Inc

Franz-Karl Reinhart

This paper gives a personal account of the research and development work at Bell Telephone Laboratories, Inc. during the first ten years following the first demonstration of semiconductor injection lasers. ...

Iop Publishing Ltd2012

Unified one-band Hubbard model for magnetic and electronic spectra of the parent compounds of cuprate superconductors

Marco Grioni, Henrik Moodysson Rønnow, Helmuth Berger, Marco Guarise, Thorsten Schmitt, Bastien Dalla Piazza, Martin Mourigal

Using low-energy projection of the one-band t-t′-t′′ Hubbard model we derive an effective spin Hamiltonian and its spin-wave expansion to order 1/S. We fit the spin-wave dispersion of several parent compounds to the high-temperature superconducting cuprate ...

American Physical Society2012

Core-Shell GaAs Nanowire p-n Junctions from Growth to Photovoltaic and Optoelectronic Applications

Carlo Colombo

Semiconductor nanowires (NWs) are filamentary crystals with the diameter ranging from few tens up to few hundreds of nanometers. In the last 15 years, they have been intensively studied for the prospectives that their unique quasi-one dimensional shape off ...

EPFL2012

High numerical aperture silicon collimating lens for mid-infrared quantum cascade lasers manufactured using wafer-level techniques

Hans Peter Herzig, Lubos Hvozdara, Pierre-Yves Baroni, Joab Di Francesco, Antoine Muller

We present an aspheric collimating lens for mid-infrared (4-14 µ) quantum cascade lasers. The lenses were etched into silicon by an inductively coupled plasma reactive ion etching system on wafer level. The high refractive index of silicon reduces the heig ...

2012

A Conversation with David R. Brillinger

Victor Panaretos

David Ross Brillinger was born on the 27th of October 1937, in Toronto, Canada. In 1955, he entered the University of Toronto, graduating with a B. A. with Honours in Pure Mathematics in 1959, while also serving as a Lieutenant in the Royal Canadian Naval ...

Institute of Mathematical Statistics2011

Growth of doped silicon nanowires by pulsed laser deposition and their analysis by electron beam induced current imaging

Reymond Clavel, Johann Michler

Doped silicon nanowires (NWs) were epitaxially grown on silicon substrates by pulsed laser deposition following a vapour-liquid-solid process, in which dopants together with silicon atoms were introduced into the gas phase by laser ablation of lightly and ...

2011

Contact Effects in Organic Transistors

Frederik Sebastian Ante

Organic thin-film transistors (TFTs) are of interest for applications that require electronic functionality with low or medium complexity distributed over large areas on unconventional substrates, such as flexible polymeric films. Generally these are appli ...

EPFL2011