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Laurent Balet

Cette personne a quitté l’EPFL

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Publications associées (31)

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Investigation into the coupling of quantum dots to photonic crystal nanocavities at telecommunication wavelengths

Laurent Balet

Recently, the emission of single photons with emission wavelength in the 1.3 µm telecommunication window was demonstrated for InAs quantum dots. This makes them strong candidates for applications such as quantum cryptography, and in a longer term, quantum ...

EPFL2009

Nanophotonic technologies for single-photon devices

Laurent Balet

The progress in nanofabrication has made possible the realization of optic nanodevices able to handle single photons and to exploit the quantum nature of single-photon states. In particular, quantum cryptography (or more precisely quantum key distribution, ...

2010

Exciton recombination dynamics in a-plane (Al,Ga)N/GaN quantum wells probed by picosecond photo and cathodoluminescence

Nicolas Grandjean, Benoît Marie Joseph Deveaud, Jean-Daniel Ganière, Denis Martin, Laurent Balet, Pierre Michel Corfdir, Samuel Sonderegger

We present a combined low-temperature time-resolved cathodoluminescence and photoluminescence study of exciton recombination mechanisms in a 3.8 nm thick a-plane (Al,Ga)N/GaN quantum well (QW). We observe the luminescence from QW excitons and from excitons ...

American Institute of Physics2010

Near-field imaging of coupled photonic-crystal microcavities

Laurent Balet

We report by means of near-field microscopy on the coupling between two adjacent photonic crystal microcavities. Clear-cut experimental evidence of the spatial delocalization of coupled-cavity optical modes is obtained by imaging the electromagnetic local ...

AIP American Institute of Physics2009

Tuning optical modes in slab photonic crystal by atomic layer deposition and laser-assisted oxidation

Laurent Balet

The authors experimentally investigate the effects of atomic layer deposition (ALD) and laser-assisted oxidation on the optical modes in GaAs L3 photonic crystal air-bridge cavities, using layers of InAs quantum dots as internal light source. Four distinct ...

2011

Engineering of light confinement in strongly scattering disordered media

Laurent Balet

Disordered photonic materials can diffuse and localize light through random multiple scattering, offering opportunities to study mesoscopic phenomena, control light-matter interactions, and provide new strategies for photonic applications. Light transport ...

Nature Publishing Group2014

Simultaneous near field imaging of electric and magnetic field in photonic crystal nanocavities

Laurent Balet

The insertion of a metal-coated tip on the surface of a photonic crystal microcavity is used for simultaneous near field imaging of electric and magnetic fields in photonic crystal nanocavities, via the radiative emission of embedded semiconductor quantum ...

2012

Enhanced spontaneous emission from quantum dots in short photonic crystal waveguides

Laurent Balet

We report a study of the quantum dot (QD) emission in short photonic crystal waveguides. We observe that the quantum dot photoluminescence intensity and decay rate are strongly enhanced when the emission energy is in resonance with Fabry-Perot (FP) cavity ...

AIP American Institute of Physics2012

Enhanced spontaneous emission in a photonic-crystal light-emitting diode

Laurent Balet, Blandine Alloing

We report direct evidence of enhanced spontaneous emission in a photonic-crystal (PhC) light-emitting diode. The device consists of p-i-n heterojunction embedded in a suspended membrane, comprising a layer of self-assembled quantum dots. Current is injecte ...

American Institute of Physics2008

Polarization-sensitive near-field investigation of photonic crystal microcavities

Laurent Balet

We report on polarization sensitive imaging of two-dimensional photonic crystal microcavity modes. By using a near-field scanning optical microscope with a polarization sensitive setup, it is possible to selectively map, with a resolution beyond the diffra ...

AIP American Institute of Physics2009

Magnetic Imaging in Photonic Crystal Microcavities

Laurent Balet

We demonstrate the nonresonant magnetic interaction at optical frequencies between a photonic crystal microcavity and a metallized near-field microscopy probe. This interaction can be used to map and control the magnetic component of the microcavity modes. ...

2010

Near-field mapping of quantum dot emission from single-photonic crystal cavity modes

Romuald Houdré, Nicolas Le Thomas, Laurent Balet

We directly investigate, by means of near-field spectroscopy, the spatial distribution of the optical cavity modes of 2D photonic crystal microcavities. Numerical simulations confirm that the photoluminescence maps of quantum dots embedded in the photonic ...

2008

Cavity-enhanced photonic crystal light-emitting diode at 1300 nm

Laurent Balet, Blandine Alloing

We report direct evidence of enhanced spontaneous emission in a photonic crystal light-emitting diode (LED) at telecom wavelength (lambda similar to 1300 nm). This result is crucial to obtain an electrically driven single photon source with high extraction ...

2009

Towards a LED based on a photonic crystal nanocavity for single photon sources at telecom wavelength

Romuald Houdré, Nicolas Le Thomas, Laurent Balet, Blandine Alloing, Carl Zinoni

A fundamental step towards achieving an "on demand" single photon source would be the possibility of electrical pumping for a single QD and thus the integration of such a device in an opto-electronic circuit. In this work we describe the fabrication proces ...

Elsevier2008

Antibonding ground state in photonic crystal molecules

Laurent Balet

We employ a far-field analysis of the angular emission pattern to experimentally assess the symmetry of localized modes in coupled photonic-crystal cavities. We demonstrate that the spatial distribution of localized modes in photonic-crystal nanocavities m ...

2012

Tuning of photonic crystal cavities by controlled removal of locally infiltrated water

Laurent Balet

We present a spectral tuning mechanism of photonic crystal microcavities based on microfluidics. The microinfiltration with water of one or few cavity holes and its subsequent controlled evaporation allow us to tune the cavity resonances in a spectral rang ...

American Institute of Physics2009

Young's Type Interference for Probing the Mode Symmetry in Photonic Structures

Laurent Balet

A revisited realization of the Young's double slit experiment is introduced to directly probe the photonic mode symmetry by photoluminescence experiments. We experimentally measure the far field angular emission pattern of quantum dots embedded in photonic ...

2011

Local infiltration of planar photonic crystals with UV-curable polymers

Romuald Houdré, Rolando Ferrini, Libero Zuppiroli, Laurent Balet, Pascale El-Kallassi

We present the local polymer infiltration of planar photonic crystal cavities via a maskless laser-writing technique. After the infiltration of the air holes with a UV-curable monomer a focused laser is used to locally polymerize the monomer in selected ho ...

2008

Controlling the charge environment of single quantum dots in a photonic-crystal cavity

Laurent Balet, Blandine Alloing, Carl Zinoni

We demonstrate that the presence of charges around a semiconductor quantum dot (QD) strongly affects its optical properties and produces nonresonant coupling to the modes of a microcavity. We show that, besides (multi)exciton lines, a QD generates a spectr ...

2009

Mode tuning of photonic crystal nanocavities by photoinduced non-thermal oxidation

Laurent Balet

A method to achieve photoinduced tuning of PhC nanocavity modes is discussed and implemented. It is based on light induced oxidation in air atmosphere with very low thermal budget which produces a local reduction of the GaAs membrane effective thickness an ...

AIP American Institute of Physics2012