Publications de Martin Heiss | EPFL Graph Search

Polarization response of nanowires a la carte

Anna Fontcuberta i Morral, Esther Alarcon Llado, Alberto Casadei, Martin Heiss, Francesca Amaduzzi, Eleonora Russo

Thanks to their special interaction with light, semiconductor nanowires have opened new avenues in photonics, quantum optics and solar energy harvesting. One of the major challenges for their full technological deployment has been their strong polarization ...

Nature Publishing Group2015

III-V nanowire arrays: growth and light interaction

Anna Fontcuberta i Morral, Federico Matteini, Esther Alarcon Llado, Martin Heiss, Gözde Tütüncüoglu, Sonia Conesa Boj, Eleonora Russo, Anna Dalmau Mallorquí

Semiconductor nanowire arrays are reproducible and rational platforms for the realization of high performing designs of light emitting diodes and photovoltaic devices. In this paper we present an overview of the growth challenges of III-V nanowire arrays o ...

Institute of Physics2014

Tuning the g-factor of neutral and charged excitons confined to self-assembled (Al,Ga)As shell quantum dots

Anna Fontcuberta i Morral, Martin Heiss, Eleonora Russo, Pierre Michel Corfdir, Yannik Fontana

We study the neutral exciton (X) and charged exciton (CX) transitions from (Al,Ga) As shell quantum dots located in core-shell nanowires, in the presence of a magnetic field. The g-factors and the diamagnetic coefficients of both the X and the CX depend on ...

American Institute of Physics2014

Plastic and Elastic Strain Fields in GaAs/Si Core-Shell Nanowires

Christophe Ballif, Anna Fontcuberta i Morral, Sylvain Dunand, Martin Heiss, Eleonora Russo, Sonia Conesa Boj

Thanks to their unique morphology, nanowires have enabled integration of materials in a way that was not possible before with thin film technology. In turn, this opens new avenues for applications in the areas of energy harvesting, electronics, and optoele ...

American Chemical Society2014

Probing inhomogeneous composition in core/shell nanowires by Raman spectroscopy

Anna Fontcuberta i Morral, Esther Alarcon Llado, Federico Matteini, Gözde Tütüncüoglu, Martin Heiss, Sonia Conesa Boj, Eleonora Russo, Francesca Amaduzzi

Due to its non-destructive and its micro-spatial resolution, Raman spectroscopy is a powerful tool for a rapid structural and compositional characterization of nanoscale materials. Here, by combining the compositional dependence of the Raman peaks with the ...

American Institute of Physics2014

Three-dimensional nanoscale study of Al segregation and quantum dot formation in GaAs/AlGaAs core-shell nanowires

Anna Fontcuberta i Morral, Martin Heiss, Sonia Conesa Boj, Eleonora Russo, Luca Francaviglia, Yannik Fontana

GaAs/Al-GaAs core-shell nanowires fabricated by molecular beam epitaxy contain quantum confining structures susceptible of producing narrow photoluminescence (PL) and single photons. The nanoscale chemical mapping of these structures is analyzed in 3D by a ...

American Institute of Physics2014

Nanoskiving Core-Shell Nanowires: A New Fabrication Method for Nano-optics

Anna Fontcuberta i Morral, Martin Heiss, Eleonora Russo, Yannik Fontana

This paper describes the fabrication of functional optical devices by sectioning quantum-dot-in-nanowires systems with predefined lengths and orientations. This fabrication process requires only two steps, embedding the nanowires in epoxy and using an ultr ...

Amer Chemical Soc2014

Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires

Anna Fontcuberta i Morral, Martin Heiss, Yannik Fontana, Eleonora Russo, Pierre Michel Corfdir, Samuel Sonderegger

Quantum-dot-in-nanowire systems constitute building blocks for advanced photonics and sensing applications. The electronic symmetry of the emitters impacts their function capabilities. Here we study the fine structure of gallium-rich quantum dots nested in ...

American Physical Society2014

Quantum Dot Opto-Mechanics in a Fully Self-Assembled Nanowire

Anna Fontcuberta i Morral, Martin Heiss, Yannik Fontana, Eleonora Russo

We show that optically active quantum dots (QDs) embedded in MBE-grown GaAs/AlGaAs core-shell nanowires (NWs) are coupled to the NW mechanical motion. Oscillations of the NW modulate the QD emission energy in a broad range exceeding 14 meV. Furthermore, th ...

American Chemical Society2014

Photonic-Plasmonic Coupling of GaAs Single Nanowires to Optical Nanoantennas

Anna Fontcuberta i Morral, Federico Matteini, Alberto Casadei, Gözde Tütüncüoglu, Martin Heiss, Eleonora Russo

We successfully demonstrate the plasmonic coupling between metal nanoantennas and individual GaAs nanowires (NWs). In particular, by using dark-field scattering and second harmonic excitation spectroscopy in partnership with analytical and full-vector FDTD ...

American Chemical Society2014