Massimo Gurioli

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Nanofluidic control of coupled photonic crystal resonators

A fine control of a photonic molecule is obtained by nanofluidic techniques. The coupling condition between the modes of two photonic crystal nanocavities is modified by spectrally tuning each single resonator. Clear mode anticrossing and transition from l ...

AIP American Institute of Physics2010

Quantum confinement dependence of the energy splitting and recombination dynamics of A and B excitons in a GaN/AlGaN quantum well

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Eric Feltin, Dobri Simeonov, Massimo Gurioli

We report the observation of well-resolved A and B excitonic resonances in the reflectivity spectra of a wedged GaN/AlGaN quantum well (QW) with 5% Al content in the barriers for different well thicknesses. For the thicker well cases, the energy splitting ...

2009

Polarization-sensitive near-field investigation of photonic crystal microcavities

Laurent Balet, Massimo Gurioli

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

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

Laurent Balet, Massimo Gurioli

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

Near-field imaging of coupled photonic-crystal microcavities

Laurent Balet, Massimo Gurioli

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

Spectral tuning and near-field imaging of photonic crystal microcavities

Romuald Houdré, Laurent Balet, Carl Zinoni, Massimo Gurioli

We experimentally observe a sizable and reversible spectral tuning of the resonances of a two-dimensional photonic crystal microcavity induced by the introduction of a subwavelength size glass tip. The comparison between experimental near-field data, colle ...

2008

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

Romuald Houdré, Laurent Balet, Nicolas Le Thomas, Massimo Gurioli

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

Nonlinear optical tuning of photonic crystal microcavities by near-field probe

Laurent Balet, Massimo Gurioli

We report on a nonlinear way to control and tune the dielectric environment of photonic crystal microcavities exploiting the local heating induced by near-field laser excitation at different excitation powers. The temperature gradient due to the optical ab ...

American Institute of Physics2008

Impact of quantum confinement and quantum confined Stark effect on biexciton binding energy in GaN/AlGaN quantum wells

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Jacques Levrat, Eric Feltin, Dobri Simeonov, Massimo Gurioli

We report on time-resolved photoluminescence measurements carried out along the thickness gradient of two types of GaN/AlGaN quantum wells with low Al content in the barriers (5% and 9%, respectively). A reduction of the biexciton binding energy with incre ...

2008

Biexciton kinetics in GaN quantum wells: Time-resolved and time-integrated photoluminescence measurements

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Eric Feltin, Dobri Simeonov, Massimo Gurioli

We report on the experimental achievement of narrow ultraviolet excitonic and biexcitonic emission from GaN/AlGaN quantum wells. The very large biexciton binding energy (up to 12 meV) inhibits thermalization between the two species allowing to study the re ...

2008

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Nanofluidic control of coupled photonic crystal resonators

Laurent Balet, Massimo Gurioli

AIP American Institute of Physics2010

Quantum confinement dependence of the energy splitting and recombination dynamics of A and B excitons in a GaN/AlGaN quantum well

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Eric Feltin, Dobri Simeonov, Massimo Gurioli

2009